1 university of copenhagen A Comparison of Producer Adoption of Precision Agricultural Practices in Denmark, the United Kingdom and the United States Pedersen, Søren Marcus; Ferguson, Richard B; Lark, R. Murray Publication date: 2001 Document Version Publisher final version (usually the publisher pdf) Citation for published version (APA): Pedersen, S. M., Ferguson, R. B., & Lark, R. M. (2001). A Comparison of Producer Adoption of Precision Agricultural Practices in Denmark, the United Kingdom and the United States. (SJFI Working Paper no. 2/2001 ed.) Statens Jordbrugs- og Fiskeriøkonomiske Institut. Download date: 03. sep
2 A Comparison of Producer Adoption of Precision Agricultural Practices in Denmark, the United Kingdom and the United States Søren Marcus Pedersen, Richard B. Ferguson and Murray Lark SJFI Working Paper no. 2/2001
3 - 3 - Preface The objective of this study was to assess the practical experiences of producers with precision agriculture practices, and to provide guidance for future research and technology development within this field. The study was carried out during autumn 2000 as a collaboration between the Danish Institute of Agricultural and Fisheries Economics, University of Nebraska and Silsoe Research Institute. The Danish part of the study is an integral part of the National Research Programme on Harmony Problems and Precision Agriculture financed by the Danish Ministry of Food, Agriculture and Fisheries. This study is also an integral part of a PhD-study at the Danish Technical University in Copenhagen focusing on technology assessment and impact analysis of precision farming practises in Denmark. The authors appreciate the assistance of producers in Denmark, the United Kingdom and the State of Nebraska who participated in this survey, as well as the following who assisted by providing information, helping with data analysis, or summary of this report: Frankie Cox Silsoe Research Institute Sandy Sterkel University of Nebraska David Varner University of Nebraska Austin Shelton University of Nebraska Inger Sommer, Danish Institute of Agricultural and Fisheries Economics, DK Morten Gylling, Danish Institute of Agricultural and Fisheries Economics, DK Jørgen Lindgaard Pedersen, Danish Technical University Søren Nielsen, LH AGRO A/S, Aabybro, DK Richard Reed, LH AGRO Ltd, Cambridgeshire, UK Egon Sørensen, Massey Ferguson, AGCO Danmark A/S, DK Mark McKinnon, Massey Ferguson AGCO, UK Results from the survey will be distributed to the participating farmers and interested readers in the individual countries by the three collaborating partners. Danish Institute of Agricultural and Fisheries Economics Farm Management and Production Systems Division Johannes Christensen
4 - 4 - Contents Preface... 3 Dansk sammendrag Introduction A Comparative Analysis Among Denmark, the United Kingdom, and the United States The Survey Process Objective About the Survey Demographics Results and Discussion Farm Type and Farming Practices Investment and Expected Impact on Farm Economy Variable Rate Application Other Costs and Benefits of Precision Farming Recommendations for Improved Precision Farming Technology Conclusions Recommendations References Appendix... 35
5 - 5 - Dansk sammendrag Præcisionsjordbrug eller sted specifik jordbehandling har gennem de senere år fået stigende opmærksomhed i landbruget. Betegnelsen betyder, i denne sammenhæng, at anvendelsen af hjælpestoffer som gødning, kalk og pesticider doseres i varierende mængder på marken i henhold til planternes stedspecifikke vækstbetingelser og jordbundsforhold. En række forskellige hjælpemidler benyttes for at udføre dette i praksis. Rygraden er geografisk positionsbestemmelse med GPS, som fastsætter positionen på marken. GPS har betydet at en række afledte teknologier er blevet udviklet til positionsbestemmelse af udbyttet og til positionsbestemmelse af jordprøver. Desuden muliggør teknikken at planternes udviklingsstadie samt forekomsten af ukrudt kan aflæses på et givent sted. Information om disse faktorer er derfor bestemmende for, hvordan forskellige input faktorer skal anvendes, og hvilket materiel som skal anvendes til at foretage en varieret doseringen. Sted specifik behandling skal ses i forhold til konventionelle metoder, hvor man almindeligvis doserer en ensartet mængde af hjælpestoffer over hele marken. Målet med præcisionsjordbrug er således at optimere anvendelsen af hjælpestoffer, forbedre driftsøkonomien og dermed mindske de afledte miljøeffekter. Selvom der gennem de seneste år er foretaget en betydelige udvikling og forskning indenfor præcisionsjordbrug, har erhvervet endnu ikke set konkrete beviser for de økonomiske og miljømæssige effekter af den nye teknologi i praksis. En bedre viden om planteavlsbedrifternes erfaringer med præcisionsjordbrug vil derfor være af stor gavn i forbindelse med den videre udvikling, rådgivning og forskning på området. I den forbindelse har SJFI i samarbejde med Silsoe Research Institute og University of Nebraska gennemført en spørgeskemaundersøgelse blandt brugere af præcisionsjordbrug i henholdsvis Danmark, Storbritannien og Nebraska (USA). De involverede bedrifter og maskinstationer er ikke tilfældig udvalgt. Det er alene producenter, som anvender én eller flere former for præcisionsjordbrug, der indgår i undersøgelsen. Specielt er listen over producenter, som anvender præcisionsjordbrug i Storbritannien og Danmark tilvejebragt af fabrikanter hvor kunderne primært anvender udbyttemålere og GPS på mejetærskeren. Samtidig repræsenterer undersøgelsens resultater alene erfaringerne fra producenter, som har været med i den tidlige udviklingsfase af præcisionsjordbrug og dermed ikke landbrugserhvervet som helhed. Spørgeskemaet blev udsendt til 349 præcisionsjordbrugere i oktober 2000, heraf 102 danske, 103 britiske og 144 amerikanske. Listen over producenter som anvender præcisionsjordbrug er tilvejebragt af Massey Ferguson (AGCO), LH-agro samt University of Nebra-
6 - 6 - ska Cooperative Extension i USA. Af de returnerede spørgeskemaer indgår 206 i besvarelsen, 78 fra Danmark (76 pct. besvarelse), 51 fra Storbritannien (50 pct. besvarelse) og 77 fra Nebraska (53 pct. besvarelse). Spørgeskemaet består af 34 spørgsmål om producenternes erfaringer og forventninger vedr. økonomi, miljø og teknisk anvendelighed af præcisionsjordbrug. Spørgsmålene er udformet ens for alle lande hvilket muliggør, at der kan foretages statistiske sammenligninger. De individuelle besvarelser var også anvendt kvalitativt i forbindelse med den videre analyse af erhvervets erfaringer. Selvom bedrifternes gennemsnitlige landbrugsareal er væsentligt forskelligt i de tre lande, med 46 ha. i Danmark, 67 ha i Storbritannien og 350 ha i Nebraska (USA), er det stadig det samme krav om bedre indtjening under stadig øget regulering som producenterne skal forholde sig til. Det skal dog understreges, at de adspurgte præcisionsjordbrug i Danmark og Storbritannien, generelt set, er noget større end gennemsnittet. Producenterne i Storbritannien har den længste erfaring med præcisionsjordbrug og er tillige den gruppe af landmænd, som har investeret mest i teknologien. De amerikanske præcisionsjordbrug er dog generelt større end de europæiske og de bruger præcisionsjordbrugsteknologier på en større andel af markerne. Derimod anvender danske og britiske landmænd præcisionsjordbrug på en større variation af afgrøder. Dette skal dog ses i lyset af, at de amerikanske landmænd alene repræsenterer staten Nebraska. For alle tre lande gælder, at de fleste afgrøder kan høstes med mejetærsker. Udbyttemåling med GPS er således den mest anvendte praksis i alle lande. Jordprøveudtagning med GPS udpegning er også udbredt, hvor de britiske og danske landmænd gennemsnitligt udtager 2-3 jordprøver pr. ha., mens de amerikanske landmænd gennemsnitligt udtager mindre end én jordprøve pr. ha. Luftfotografering og fjernsensorer er tydeligvis mere udbredt i US sammenlignet med Storbritannien og Danmark. I stedet er der flere danske og britiske landmænd, som kortlægger jordens ledningsevne til bestemmelse af jordstrukturen (fx EM 38). Danske og amerikanske landmænd er overvejende optimistiske med hensyn til en forøgelse af udbyttet gennem præcisionsjordbrug, mens britiske landmænd er mere skeptiske. Der er dog ikke forskel i opfattelsen af den forventede økonomiske effekt fra præcisionsjordbrug. Hovedparten forventer, at dækningsbidraget forøges med mellem 60 og 240 kr. pr. hektar i
7 - 7 - løbet af de næste 5-10 år. Den største økonomiske gevinst forventes at komme fra stedspecifik gødningsanvendelse. Desuden forventes udbyttemåling og variabel kalkanvendelse at have stor betydning for økonomien. På trods af forventningerne om højere dækningsbidrag er der en generel opfattelse af, at forbruget af kvælstof og andre næringsstoffer i overvejende grad vil forblive uændret ved brug af præcisionsjordbrug. I den forbindelse er der en stor andel af producenterne (57 pct.) som ser en fordel i stedspecifik anvendelse af husdyrgylle. Danske producenter forventer, at der er mulighed for at reducere forbruget af pesticider ved stedspecifik anvendelse. Producenterne i de to andre lande er mere skeptiske og forventer et uændret forbrug. Der er ligeledes delte meninger i de 3 lande om, hvorvidt kalkforbruget vil ændres ved anvendelse af præcisionsjordbrug. Udover den økonomiske og miljømæssige påvirkning ved indførelse af præcisionsjordbrug fandt mange producenter i specielt Danmark og USA præcisionsjordbrug nyttigt i form af dokumentation til myndighederne, forbrugere mv. Den største ulempe vurderes at være investeringsomkostningerne og den tilsyneladende mangel på økonomisk afkast. Dette er interessant set i lyset af producenternes generelle optimistiske forventning om øget dækningsbidrag. Tidsforbruget i forbindelse med anvendelse af præcisionsjordbrug bliver også betragtet som en væsentlig ulempe, selvom de fleste brugere anvender mindre end 2 timer ugentlig på udarbejdelse af udbyttekort, arbejde ved computer, kurser mv. Mange af producenterne ønsker brugervenlig teknologi og bedre teknologisk tilpasning mellem hardware og software. Bedre rådgivning og bevis for større økonomisk afkast er også ønskværdigt blandt mange af de adspurgte producenter. Et flertal mener desuden, at driftsledelsen på gården skal være med ved udarbejdelse af tildelingskort og databehandling. Samtidig mener hovedparten af de danske producenter, at planteavlskonsulenterne skal deltage i denne proces, hvilket ikke er tilfældet i Storbritannien. Dette forhold kan til en vis grad forklares med forskellen i rådgivningssystemet imellem de tre lande. Generelt set er de amerikanske landmænd i højere grad tilfredse med rådgivningen sammenlignet med deres danske og britiske kolleger og de er tillige de mest entusiastiske, når det gælder en anbefaling af præcisionsjordbrug til andre landmænd. De fleste af de adspurgte producenter har et positivt syn på præcisionsjordbrug, på trods af de manglende økonomiske afkast. Der er dog stadig en udbredt skepsis i alle lande med hensyn til den tilsyneladende mangel på bevis for øget udbytte og reduceret anvendelse af hjælpestoffer. I den henseende bliver det i korte træk anbefalet, at der fokuseres på en ræk-
8 - 8 - ke hovedområder i forbindelse med den videre udvikling af præcisionsjordbrug. For det første skal den videnskabelig dokumentation for øget udbytte og reduceret input præciseres, og der skal fokuseres mere på udvikling af kompatible teknologier og ensartede standarder. Rådgivningen skal være mere objektiv og mindre kommerciel, og slutteligt anbefales det, blandt producenterne, at der udformes mere brugervenlige teknologier, som samtidig er mindre tidsrøvende.
9 Introduction While a lot of research and commercial development has taken place in precision agriculture in recent years there is little information available about the experience and opinions of the producers who are trying to make it pay its way in the field. Information about producer experiences in precision agriculture would be useful in guiding future research and development in both the public and private sectors. Important questions could include: what types of precision agriculture practices are producers adopting and why? What are the advantages or disadvantages of using precision agricultural practices on farms? What are the expected economic benefits from precision farming? To address these questions, we conducted a survey of producers in three countries in autumn 2000 Denmark, Great Britain and the United States (Nebraska). This was not a random survey it was only sent to producers who have used some components of precision agriculture. As such, it represents the opinions of those early adopters who have participated in the initial development of precision agriculture, and does not necessarily represent the opinions of the broader producer population in any of the countries surveyed A Comparative Analysis Among Denmark, the United Kingdom, and the United States Production agriculture is quite different in Denmark, the UK and the US the average farm size in Denmark is about 46 hectares, compared to about 67 hectares in the UK and 350 hectares in Nebraska yet producers in all three have the common challenge of maintaining a profitable farming operation in an increasingly complex and regulated system. We chose to study three countries that have a number of common characteristics. The importance of the agricultural sector in terms of gross national product (GNP) and fraction of the workforce (about 5% or less) employed in agriculture is about the same. Adoption of agricultural technology is relatively similar among the three countries. All three countries or regions have been using some precision farming technologies for the last 10 years. However, there are also substantial differences in agriculture among the three countries. Arable farming has traditionally been performed extensively with moderate inputs in the state of Nebraska, focused on cash crops such as corn (maize), soybean, grain sorghum, winter wheat, alfalfa and edible beans. The total land area per farmer is relatively high. Due
10 to the semi-arid climate, crops such as corn and soybean are often irrigated in Nebraska. In the United Kingdom cereals receive higher inputs than in Nebraska due to the more favourable climate for cereal production. Common crops in Britain are winter wheat, winter and spring barley, oilseed rape, beans, linseed, peas, beets and potatoes. The Danish agricultural sector has many similarities with the British farm business due to common weather conditions, similar crop rotations and inputs. Climate in both Denmark and the UK is significantly influenced by the Gulfstream, which moderates temperature extremes relative to the northerly latitude of both countries. Common arable crops in Denmark are winter wheat, winter barley, oilseed rape, potatoes, peas, beets and potatoes, maize silage and grass silage. Denmark also produces significant quantities of grass seed. In Denmark, there is considerable emphasis on animal production, with lesser emphasis on livestock in the UK and US. Consequently, the efficient use of animal manures and slurries is a significant issue in Denmark. Finally, there are differences in regulation among the three countries. Due to denser human populations and heightened environmental concern, producers in Denmark must deal with greater regulation than in the UK, both national and European Union (EU) regulations, on fertiliser and pesticide inputs as well as manure use, and both countries face greater regulation than Nebraska producers. (Langkilde, 1999) The Survey Process The survey was sent to a total of 349 users of precision agriculture technology in October Of this total, 102 were located in Denmark, 103 in the United Kingdom, and 144 in Nebraska in the United States. These producers were not selected at random, but rather were chosen to include only those who have had experience with one or more precision agriculture technologies. Survey participants were obtained from lists provided by Massey Ferguson (AGCO) and LH Agro in Denmark and the UK, and from the University of Nebraska Cooperative Extension in the US. A total of 206 producer responses were included in the analysis of the survey: 78 from Denmark (76% response), 51 from the UK (50% response), and 77 from Nebraska (53% response).
11 Objective The objective of this study was to collect and assess the practical experiences of producers with precision agriculture practices, and to provide guidance for future research and technology development. Further, we expected that the comparative experiences of producers using precision agriculture technologies in other countries would be of interest to farmers in each country, and perhaps provide useful information on further adoption of practices in each country. We expect that this information will also be useful to crop consultants and others engaged in advising producers on effective use of precision agriculture technologies About the Survey The survey consisted of 34 questions (see appendix) about different issues related to the adoption and use of precision agriculture technologies. Questions were the same in all three countries, with adjustments in how the questions were phrased in order to reflect language differences. This approach allowed the statistical comparison of responses among the three countries for most of the categorical questions. When respondents were asked to fill in a blank with their opinion, the responses were classed for statistical comparison. Individual comments were also used as qualitative arguments in the further assessment and impact analysis. For comparative purposes on economic questions, the relative value of currencies in the three countries were: 12 DKK = 1.00; $1.50 = 1.00; 8 DKK = $1.00. In order to consolidate the long lists of crops produced in each country for comparative purposes, the following categories were used in some analysis: Beets Sugar beets and fodder beets Grass Grass hay and pasture Grass seed All types of grass for seed production Clover Red and white clover Potatoes Potatoes for both human consumption and starch Wheat Winter and spring wheat Barley Winter and spring barley Corn Corn (maize) for grain (animal and human consumption, silage and fodder Responses were analysed statistically when possible. Frequency of response, or in some cases mean values, for each question were evaluated among countries, using SAS (Statistical Analysis Systems, SAS Institute, Cary, NC, US) procedures of chi-square and
12 linear regression. In some cases, analysis was conducted across, rather than among, countries. The majority of questions summarized in the Results and Discussion section have statistically significant differences (P<0.05), unless otherwise noted Demographics The age distribution of farmers adopting precision agricultural practices tends to be similar among the three countries (figure 1.1). In general, younger farmers may be interested in precision agriculture but have less economic flexibility to invest in equipment, while older farmers may be reluctant to invest in the time necessary to learn new technologies. FIGURE 1.1. Age distribution of producers using precision agriculture 50 Percent DK UK US Age Farms in the US tend to be larger, followed by the UK, then Denmark (figure 1.2). The land area farmed by producers using precision technologies in all three countries tends to be larger than the average in each country.
13 FIGURE 1.2. Area farmed by producers using precision agriculture 50 DK Avg. UK Avg. Nebraska Avg. 40 Percent DK UK US Area (Hectares)
14 Results and Discussion 2.1. Farm Type and Farming Practices There are differences in how survey respondents use or provide precision agriculture services (figure 2.1). The largest category is those who provide all precision agriculture services on their own farm. There is a larger proportion of farmers in the US and UK who contract with others for some services, while a larger proportion of Danish and UK farmers will provide some services as well as use them on their own farm. These responses in particular may not necessarily represent substantial differences among countries as a whole, since the survey was not from a random sample. It was known, for example, that the survey list in Denmark contained a number of individuals who provided precision services and also used them on their own farms. FIGURE 2.1. How producers use or provide precision agriculture services Percent DK UK US 0 I do all precision farming services on my farm myself. I contract with others for all precision farming services done on my farm. I do some precision farming activities myself, and hire others for some activities. I do some precision farming services for hire, as well as use them on my own farm. I solely provide precision farming services to farmers, I do not apply them on my own farm. Precision farming practices have been applied on a large variety of crops, although the most common application is to grain crops that can be harvested by a combine harvester (Table 1). This finding was anticipated given that the UK and Denmark survey participants were customers of companies producing yield-mapping combines. Precision technologies have been used on a wider variety of crops in Denmark and UK than in Nebraska in the US. In Nebraska, 100% of respondents have used precision practices for corn production, and 87%
15 have used them for soybean production. In Denmark and the UK, 91% and 95% respectively use precision practices on wheat, as well as on barley, oilseed rape, grass seed, peas and tubers (beets and potatoes). It should be stressed that table 2.1 only includes crops where some type of precision practice has been used. It does not address the extent of current farm practices within each country on each crop. TABLE 2.1. Percentage of respondents in each country who have used a precision practice for the given crop Crop DK UK US % Wheat Barley Rye Oat Triticale Oilseed Rape Corn (maize) Grass seed Flax Beets Potatoes Peas Linseed Beans Soybean Grain sorghum Other 1) ) Crops where 5 percent or less precision practices are used in the three countries include: Seed corn, grass, herbage seed, edible beans and alfalfa. Farmers in the US tend to use precision agriculture practices on a greater percentage of the land area they farm (figure 2.2). This likely relates to fewer crops being grown in Nebraska, relative to Denmark and the UK, and the applicability of precision technologies to those crops. For example, yield mapping of grains such as corn, wheat and soybean is a relatively mature technology compared to yield mapping of root crops such as sugar beet or potatoes. Figure 4 illustrates that over 60% of Nebraska producers who are using one or more precision technologies use those technologies on % of the area they farm, compared to around 40% for UK producers and 35% for Danish producers.
16 FIGURE 2.2. Use of precision practices on proportion of land farmed Percent DK UK US % 20-40% 40-60% 60-80% % Percent of Area Using Precision Practices There are differences among countries in how long farmers have used precision practices, with farmers in the UK tending to have used them longer than farmers in the US or Denmark (figure 2.3). The majority of Danish and US respondents have used one or more precision practice between two and four years, while the majority of UK respondents have used a precision practice between five and seven years. The fifty percentile line, for example, shows ½ of Danish respondents have used precision practices almost 3 years, ½ of Nebraska farmers have used them almost 4 years, and ½ of UK farmers have used them almost 5 years. FIGURE 2.3. Length of time producers have used a precision practice (cumulative distribution) 100 Percent of Producers DK UK US Years Using One or More Precision Practice
17 The use of precision practices varies among countries. Table 2.2 illustrates the response when asked what precision practices producers had used at any time on their farm. TABLE 2.2. Use of precision practices among countries (Percent of respondents in each country who indicate they have used the practice) Practice DK UK US % Information Gathering Grid soil sampling Directed soil sampling Yield monitoring (no GPS) Yield mapping (GPS) Aerial photography Remote sensing GPS-pest monitoring Soil conductivity mapping Soil topography mapping Conventional soil mapping 17 Mean Taking Action VRT fertilization VRT lime VRT pesticide Mean Other Yield mapping with GPS is the most common practice used in all three countries. This is not surprising, particularly in Denmark and the UK, as the survey list in those countries was derived from customer lists of manufacturers of yield mapping combines. Yield monitoring without GPS is used significantly only in the US, where producers with yield monitors without GPS have used them to compare variety performance and differences among fields. Grid soil sampling is another common practice, along with VRT fertilization or lime application. Directed soil sampling, according to yield maps or other spatial information, is a practice of increasing popularity in the US and UK, given the high investment required for grid sampling. A larger percentage of producers have tried aerial photography or remote sensing in the US relative to the UK and Denmark, probably reflecting climate differences (number of cloud-free days during the growing season) and the availability of those services. Surprisingly few producers are using GPS to scout for pests or VRT application of pesticides in any of the countries. More producers in the UK and Denmark have mapped soil conductivity on their farms than in the US. A significant number of producers in the
18 UK indicated they had used conventional soil surveys on their farm (this question was not asked of producers in the US or Denmark). In the US, a significant percentage of producers had had their fields mapped for topography, primarily in relation to levelling for irrigation. The most commonly mentioned other practice was variable rate seeding. Precision soil sampling, either grid-based or directed according to a yield map or other spatial resource, is a common practice in all three countries. In the UK, 48% said they used some type of precision soil sampling, compared with 44% in Denmark and 35% in the US. Of farmers using grid sampling, those in the UK and Denmark have used it on a higher percentage of the land precision sampled than in the US 91% (UK) and 83% (Denmark) vs. 57% in the US. The opposite is true for directed soil sampling when respondents used directed sampling, they applied it on 55% of their land in the US, vs. 26% in the UK and 17% in Denmark. Division of precision practices into information gathering (evaluative), and taking action (prescriptive) is also useful. Table 2 shows that, on average, US and UK producers are highest in adoption of evaluative, or information gathering, practices (32% and 29% average adoption, respectively, compared to an average adoption of 19% in Denmark). Producers in the UK are more likely than Danish or US producers to take action on the information they have gathered, with 34%, on average, adoption of prescriptive practices, compared to 24% and 25% in Denmark and the US Investment and Expected Impact on Farm Economy The capital investment in precision agriculture, such as field equipment, computers, software and training, varied somewhat among countries. The greatest investment tended to be in the UK, followed by the US, with the least investment by producers in Denmark (figure 2.4). This trend is likely related to the length of time producers have been using precision agriculture (with UK producers tending to have used precision practices longer), and total farm size (with Danish farms smaller on average than UK or Nebraska farms). When producers do grid soil sample a field, they tend to invest about the same in all three countries 13/ha in Denmark, and 14/ha in both the UK and US. However, there are significant differences in the average densities used for grid sampling among the countries. Farmers in the UK on average collect 3 soil samples per ha, farmers in Denmark 2 samples per ha, and farmers in the US only about 0.7 samples/ha. There was also a tendency for the grid sample density to be less with larger farm size across all three countries.
19 FIGURE 2.4. Capital investment by producers in precision agriculture Percent DK UK US Investment (thousands) There were significant differences in farmers attitudes about the potential for yield increases with precision agriculture (figure 2.5). Producers in Denmark and the US were equally optimistic that yield increases could be obtained on their farms through precision agriculture, while significantly more UK farmers were less optimistic. The same percentage of producers in all three countries were unsure about the potential for increased yield on their farm. FIGURE 2.5. Proportion of producers who feel precision agriculture will increase yield on their farm Percent DK UK US Yes No Don't Know
20 There were, however, no significant differences in perception about profitability of precision agriculture among producers in the three countries (figure 2.6). Farmers were generally quite optimistic about the potential for precision farming to increase their gross margin, with the majority expecting an increase between 5 and 20/ha. However, most respondents expect that it will take about 5-10 years to obtain the expected potential profit from precision farming. FIGURE 2.6. Expected eventual impact on gross margin per hectare Percent DK UK US > 40 /ha When asked to list the top three practices they felt would have the most potential economically for their farm, producer responses varied somewhat by country (table 2.3). The most commonly listed practice among all three countries was variable rate fertilization. The second most commonly listed practice in the UK and US was yield mapping, while in Denmark the second most commonly listed practice was variable rate lime application. The third most commonly listed practice in the US and UK was grid soil sampling, while the third most commonly listed practice in Denmark was variable rate pesticide application. When grouped according to practices which are information-gathering or taking action, it is clear that Danish producers currently see a greater economic benefit to taking action than do producers in the US or UK. Two-thirds of Danish farmers believe either variable rate fertilisation, liming, or pesticide application will be economically beneficial, compared to 34% in the UK and 25% in the US. This is likely related to restrictions on N rates below the economic optimum in Denmark, as well as substantial taxation on the use of pesticides (Langkilde, 1999).
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