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1 Start Farming Introduction to Soils Fact 4 Determining Nutrient Applications for Small Farms Basic Calculations Conventional Generally production systems in Pennsylvania use a mixture of nutrient sources. Soil testing is the best way to know how many nutrients we need to apply in a given year for our next crop. However, nitrogen supplied from organic materials such as compost and manure are supplied slowly over time. We are actually feeding soil organisms that release these nutrients in organic forms. The rate that nutrients are released depends on the number of soil organisms, the quality of the material they eat, soil temperature, moisture and more. Because nitrogen release varies over the season and even day to day nitrogen values on your soil test are based on the average nitrogen needs of your crop. If you have applied manure or compost over the past few years these suggested values may over estimate your needs. It is especially important to calculate your applications when you are using compost and manure because they contain nutrient levels that are not in balance with plant needs. If you apply compost or manure at levels that will meet your crop needs for nitrogen they will almost always exceed crop needs for phosphorus and potassium. High phosphorus and potassium levels can then be both a hazard for the environment and promote certain types of weeds. In order for us to calculate how many nutrients to apply to our fields, we need to know how much is being released from the soil organic matter and the organic inputs we have applied in the past. This requires testing the amount of nitrogen, phosphorus, and potassium in what we apply, testing our soil, doing some basic calculations and keeping a nutrient budget. See Using Organic Nutrient Sources, and Deciding which Organic Nutrients to Use and How Much to Apply < These tools are easy to use, requiring a little bit of basic math, your soil test and your compost or manure test. If you have not tested your inputs, the procedure below will get you close. Remember an estimate is just an estimate. College of Agricultural Sciences Agricultural Research and Cooperative Extension

2 STEP 1: Use Table 1.0 below to calculate your nutrient needs based on tables Line 1. Recommendations based on Nutrient Needs: Vegetable specific recommendations based on research are given in the Commercial Vegetable Production Recommendations [1] available at < >. Agronomic crop recommendations based on research are given in the Penn State Agronomy Guide [2]. Line 2. Recommendations based on Soil Test: See your soil test report. Note that nitrogen recommendations on your soil test from Penn State are not based on soil nitrogen levels because available soil nitrogen levels fluctuate greatly day to day and even hour to hour. Nitrogen recommendations on your soil test are from average recommendations (Line 1). Line 3a. Soil Organic Matter: Most recommendations account for some organic matter N for average soil OM levels. However, if organic matter has been increased a larger credit should be taken. Calculate this additional credit as 20 pounds per acre of nitrogen (0.5 lb/1,000 sq. ft.) for each percent OM over 2%. For example, if a soil that has 3% organic matter you could expect this to provide 20 pounds of additional OM nitrogen per acre [3]. This is the credit that would be entered in the table. Phosphorus and Potassium from soil organic matter will be reflected in the soil test values and should not be included here. [3]. Note. Currently Penn State soil test results for vegetables include no OM credit. Agronomic tests include a credit for 2% OM. Line 3b. Manure Nitrogen: Use Table 1.1 to find the amount of nitrogen available from manure applied in the last 2 years. We are assuming that the manure you applied will be slowly available over three years. In year one, 50% of the nitrogen is released; in year two and three, 50% of what is left. If there is not an application rate similar to what you used in the chart, multiply the percent of each nutrient times the pounds you applied to give you the total amount of nutrients you applied per acre. Then divide by four to get the amount available now, 1 or 2 years after it was applied. Line 3b. Manure Phosphorus & Potassium: If a soil test was taken after this manure application the phosphorus and potassium from the manure will be reflected in the soil test values and should not be included as a credit here. If no soil test has been take since these previous applications a credit for the P and K applied minus what the crops removed should be taken. If no information is available on actual crop P and K removal an average of 25 lb P2O5 per acre and 100 lb K 2 O per acre can be used for removal. Use Table 1.2 to calculate estimated values if no soil tests are available. Line 3c. Compost Nitrogen: Use Table 1.1 to find the amount of nutrients available from compost applied in the previous two years. We are assuming that 15% of the nitrogen contained in the compost was available last year when you applied it another 15% the next two years. This will vary depending on how mature the compost is. If the compost is less mature, more will tend to be available in the first year. Line 3c. Compost Phosphorus & Potassium: If a soil test was taken after this compost application the phosphorus and potassium from the compost will be reflected in the soil test values and should not be included as a credit here. If no soil test has been take since these previous applications a credit for the P and K applied minus what the crops removed should be taken. If no information is available on actual crop P and K removal an average of 25 lb P2O5 per acre and 100 lb K 2 O per acre can be used for removal for vegetables. Use Table 1.2 to calculate estimated values if no soil tests are available for vegetables. For agronomic crops removal rates are outlined in Table 1.3. Use Table 1.4 to calculated estimated values if no soil tests are available for agronomic crops. 34

3 Start Farming Introduction to Soils Fact 4 Determining Nutrient Applications for Small Farms Basic Calculations Conventional Line 3d. Cover Crop: Use Table 1.5 to find the amount of nitrogen that may be available in the season following a legume cover crop. For a more accurate estimate see handout Calculating Nitrogen Availability from Your Legume Cover Crop available from Penn State Cooperative Extension Northampton County < tdupont@psu.edu >. There will be no P or K credit for cover crops because they do not add P or K, they just hold it in the soil. Line 3e. Leguminous Crop: Use Table 1.6 to find the amount of nitrogen that may be available in the season following a previous crop of alfalfa, soybean or clover hay. There will be no P or K credit for leguminous crops because they do not add P or K, they just hold it in the soil Table 1.0 Calculating Nutrient Credits and Needs a 1. Total crop nutrient needs (from Vegetable Guide) 2. Recommendations based on soil test 3. Credits a. Soil organic matter b. Manure c. Compost d. Prior cover crop e. Prior leguminous crop 4. Total credits (add a. +b. + c. +d +e.) 5. Additional needed ( ) Nitrogen (N) lbs/a Phosphate (P ) lbs/a Potash (K 2 O) lbs/a *only needed if you don t have a soil test a From Table Organic Cole Crop Production NYS IPM Publication No. 134 [3]. College of Agricultural Sciences Agricultural Research and Cooperative Extension

4 Table 1.1 Available Nitrogen from Compost and Manure the Year after Application Sources Nitrogen Nitrogen Available (lbs) % 100 lbs (wheel barrow) 2,000 lbs (1 ton pickup)/a 80 tons (1"/ acre) Other d Compost a,b Mushroom Compost ab Horse Manure c,d Cattle Manure c d Sheep Manure c,d Swine Manure c,d Poultry Broiler c d Poultry Layer c,d a From Using Organic Nutrient Sources Table 3 [4]. b For nitrogen available from compost the year after it is applied first multiply percent nutrient x amount applied, i.e., for 1.5% N (0.015 x 2,000 lbs = 30 lbs N applied). Then multiply by the percent available. For compost, we assume 10% N available in year after it was applied, i.e. (30 lbs N applied x 0.10 = 3 lb N available in year 2). c From the Penn State Agronomy Guide Table [2]. d For nitrogen available from manure the year after it is applied first multiply the percent nutrient x the amount applied, i.e., poultry broiler manure has 2% N (0.02 x 2,000 lbs manure applied = 60 lb N applied). Then multiply by the percent available. For manure we assume 50% of N was available in the year it was applied, and an additional 25% in years the second and third years i.e. (60 lbs N applied x 0.25 = 15 lbs N available in year 2 nd year after application). 36

5 Start Farming Introduction to Soils Fact 4 Determining Nutrient Applications for Small Farms Basic Calculations Conventional Table 1.2 Available Phosphorus and Potassium from Compost and Manure the Year after Application in VEGETABLES Sources Nutrients (percent) Nutrients Available Yr 2 (lbs) 2,000 lbs (1 ton pickup)/a 80 tons (1"/ acre) Other d,e P - K P2O5 K2O P2O5 K2O P2O5 K2O Compost a,c Mushroom Compost a,c Horse Manure b,c Cattle Manure b,c Sheep Manure b,c Swine Manure b,c Poultry Broiler b,c Poultry Layer b,c a From Using Organic Nutrient Sources Table 3 [4]. b From the Penn State Agronomy Guide Table [2]. c For P & K we assume that 100% of the nutrient is available the year it is applied. However each crop may not use all of the P & K you apply. If you took a soil test after your last crop the remaining P & K will be reflected in your soil test. Use the numbers from your soil test. If you did not you may use the numbers above or calculate a more specific value below. d For P multiply %P by the amount you applied (ie for poultry manure broiler at 3.1% P multiply.031 x 2000 lb = 62 lb P) and then subtract the amount of P your last crop used. On average vegetables use 25 lbs of P per year/ A. IE. (62 lb of P applied 25 lb used by the vegetable crop = 37 lb of P available for the next crop. P removal rates vary by crop. For more specific values see Nutrient Removal Rates for Vegetables [5]. e For K multiply K by the amount you applied (ie for poultry manure broiler at 2.1% P multiply x 2000 lb = 42 lb P applied). Then subtract the amount of K your last crop used. On average vegetables use 100 lbs of K per year/ A. IE. (42 lb K applied 100 lb K used = -58 lb K) you most likely don t have any K left in this scenario. K removal rates vary by crop. For more specific values see Nutrient Removal Rates for Vegetables [5]. College of Agricultural Sciences Agricultural Research and Cooperative Extension

6 1.3 Typical crop nutrient removal by AGRONOMIC CROPS for phosphorus and potassium. a Crop (units) Removal for Per unit of yield Typical given yield yield/a P K 2 0 P K 2 0 Corn (bu) (bu) Corn silage (T) b (T) Grain sorghum (bu) (bu) Forage sorghum (T) b (T) Sorghum/sudangrass b (T) Alfalfa (T) c,d (T) Red Clover (T) c,d (T) Trefoil (T) c,d (T) Cool-season grasses (T) c,d (T) Bluegrass (T) c,d (T) Wheat/rye (bu) e (bu) Oats (bu) e (bu) Barley (bu) e (bu) Soybeans (bu) e (bu) Small grain silage (T) b (T) a From the Penn State Agronomy Guide Table b 65% moisture. c For legume-grass mixtures, use the predominant species in the mixture. c 10% moisture. e Includes straw. 38

7 Start Farming Introduction to Soils Fact 4 Determining Nutrient Applications for Small Farms Basic Calculations Conventional 1.4 Available Phosphorus and Potassium from Compost and Manure the Year after Application in Agronomic Crops Sources Nutrients (percent) Nutrients Available Yr 2 (lbs) c,d,e N-P-K Compost a Mushroom Compost a Horse Manure b Cattle Manure b Sheep Manure b Swine Manure b Poultry Broiler b Poultry Layer b N-P-K a From Using Organic Nutrient Sources Table 3 [4]. b From the Penn State Agronomy Guide Table [2]. c For P & K we assume that 100% of the nutrient is available the year it is applied. However each crop may not use all of the P & K you apply. If you took a soil test after your last crop the remaining P & K will be reflected in your soil test. Use the numbers from your soil test. If you did not, calculate a more specific value below. d For P multiply %P by the amount you applied (ie for poultry manure broiler at 3.1% P multiply.031 x 2000 lb = 62 lb P) and then subtract the amount of P your last crop used. P removal rates vary by crop. Use the values in Table 1.3 for agronomic crops. For more specific values see Nutrient Removal Rates for Vegetables [5]. e For K multiply K by the amount you applied (ie for poultry manure broiler at 2.1% P multiply x 2000 lb = 42 lb P applied). Then subtract the amount of K your last crop used. Use the values in Table 1.3 for agronomic crops. College of Agricultural Sciences Agricultural Research and Cooperative Extension

8 Table 1.5 Available Nitrogen from a Previous Legume Cover Crop a Legume Cover Crop Dry Matter (lb/a/yr) Total N (lb/a) Available N (lb/a) b Available N (lb/1,000 sq ft) b low high low high low high Berseem Clover 6,000-10, Cowpeas 2,500-4, Crimson Clover 3,500-5, Field Pea 4,000-5, Hairy Vetch 2,300-5, Medics 1,500-4, Red Clover 2,000-5, Subterranean Clover 3,000-8, Sweet Clover 3,000-5, White Clover 2,000-6, Wooly Pod Vetch 4,000-8, a Summarized from Managing Cover Crops Profitably [6]. b The amount of available nitrogen depends on the amount of cover crop that you grow. If you have a poor stand or the cover crop only grows to half its potential height then use the low range numbers. If you are plowing your cover crop in late in the spring or there is a lot of biomass there use the high range. Remember, really poor stands mean no contribution at all. 40

9 Start Farming Introduction to Soils Fact 4 Determining Nutrient Applications for Small Farms Basic Calculations Conventional Table 1.6 Available Nitrogen Contributed from Previous Leguminous Crop a Previous crop b First year after alfalfa First year after clover or trefoil hay First year after soybeans harvested for grain Percent Stand High productivity fields Moderate productivity fields Nitrogen Credit (lbs/a) >50% % <25% Nitrogen Credit (lbs/a) >50% % <25% Low productivity fields 1 lb N/bu soybeans - avg yield in PA = 46 bu/a 2009 a From the Penn State Agronomy Guide Table [2]. b When a previous legume crop is checked on the Penn State soil test information sheet, the residual nitrogen for the following year is calculated and given on the report. This credit should be deducted from the N recommendation given on the soil test report. College of Agricultural Sciences Agricultural Research and Cooperative Extension

10 STEP 2: Use Table 2.0 to Calculate Your Nutrient Applications based on Tables Line 1. This is from Table 1.0 line 5. Line 2. Choose possible sources from Tables If your P&K levels are low, the first choice will generally be to utilize materials already on the farm ie. manures or composts or other readily available nearby sources. An important consideration with these sources is that the relative amounts of the different nutrients in these materials may not match up with the nutrient requirements of crops. For example, if most manures or composts are applied to meet the available N requirements of a crop, excess P and K will usually be applied. If possible, the best approach is to apply these multinutrient souces at a rate that does not apply a significant excess of any nutrient. Realize that this will result in less than adequate amounts of the other nutrients. In order to avoid over application of P & K choose your planned rate for manure or manure based compost on Phosphorus needed. Line 3-5. Select single nutrient sources or sources with a high proportion of the needed nutrient to supplement manure or compost to meet the crop requirements. It is a good idea to write down the rates for several sources and figure out the cost per pound or per application of nutrient. Circle the source(s) you plan to use and cross out more expensive or unavailable options. The necessary calculations follow: a Calculate the rate per acre or per 1000 sq ft of each source to meet the nutrient need. To do this divide the nutrient need by the available N, P 2 O 5, or K 2 O in the material from table 1.1. Alternatively, find the amount of nutrient required at the top of tables for N, P, and K respectively and then read the rate of the desired material from the table. b Select a practical planned rate per acre or 1000 sq ft for this material that is less than or equal to the calculated rate. c Multiply the available N, P 2 O 5, or K 2 O in the material from table 1.1 times this planned rate to determine the amount of N, P 2 O 5, or K 2 O applied per acre or 1000 sq ft at the planned rate. d Calculate the balance after the planned application of each source by subtracting the nutrient applied in previous step from the Nutrients Needed or the balance from the previous application. e Ideally the balance after the last material is applied should be 0, indicating that the nutrient needs have been met exactly. When using organic sources, this is rarely the case because they contain multiple nutrients in a variety of ratios that do not always match the ratio of nutrient required by crops. In general, it is highly recommended that N not be significantly over applied. Over application of P can represent an environmental threat. If P is significantly over applied you should assess the possibility that P could be transported from the site to nearby water primarily by erosion or runoff. If this is likely, excess P should not be applied. The Pennsylvania P Index ( is a tool that can help make this assessment. If P transport from the field is not a concern, excess P applied in one year can be used in following years. However, this build up should be considered in the long term planning and repeated applications of excess P should be avoided. Excess K is not an environmental concern but can be a crop quality concern that should be considered. 42

11 Compare price of alternatives A,B,C Compare price of alternatives A,B,C Start Farming Introduction to Soils Fact 4 Determining Nutrient Applications for Small Farms Basic Calculations Conventional Table 2.0 Calculating Nutrient Applications Nutrients Needed 1. Additional Needed Nutrients - lbs/a (Table 1.0 line 5) OR 1. Additional Needed Nutrients - lbs/1000 sq ft (Table 1.0 line ) Nitrogen (N) Phosphate (P ) Potash (K 2 O) Nutrients to Apply Nutrient Source 2. Source 1 a Calc. rate/acre or 1000 sq ft. b Planned rate/acre or 1000 sq ft. c Nitrogen (N) lbs/a or 1000 sq ft. d Phosphate (P ) lbs/a or 1000 sq ft. e Potash (K 2 O) lbs/a or 1000 sq ft. \$/acre or 1000 sq ft. 4 Balance after Source 1 is applied 3. Source 2 (alternative A) Source 2 (alternative B) Source 2 (alternative C) d Balance after Source 2 is applied 4. Source 3 (alternative A) Source 3 (alternative B) Source 3 (alternative C) d Balance after Source 3 is applied College of Agricultural Sciences Agricultural Research and Cooperative Extension

12 2.1. Available NITROGEN from Fertilizer a (per ACRE) Sources Compost Nutrients (lb nutrient/lb material) b N-P 2 O 5 -K 2 O Target lbs of N/ A Provided by lbs of fertilizer below Urea Ammonium Nitrate Horse Manure (Fresh) c Cattle Manure (Fresh) c Poultry Manure (50%) c a Adapted from Using Organic Nutrient Sources and Organic Cole Crop Production calculations of nutrient needs [3, 4]. b The percentage of plant available nutrients is highly variable. Averages are used here. Testing for compost and manures is recommended. c For compost, average values for percent nutrients are used. First multiply percent nutrient x amount applied, i.e., for 1.5% N (0.015 x 2,000 lbs = 30 lbs N applied). Then multiply by the percent available. For compost, we assume 10% N available for plant use in year 2, i.e. (30 lbs N applied x =.3 lb N available in year 2). d Plant nutrients are available during year of application. Actual nutrients available are highly variable due to amount of bedding included and animal diet. Testing of your manure source is recommended. Un-composted manure must be used on fields with crops not to be consumed by humans or incorporated into soil a minimum of 90 days before harvest, provided the product does not touch the soil and 120 days before harvest if the product does contact the soil for certified organic production. 44

13 Start Farming Introduction to Soils Fact 4 Determining Nutrient Applications for Small Farms Basic Calculations Conventional 2.2 Available PHOSPHORUS from Fertilizer (per ACRE) Sources Nutrients (lb nutrient/lb material) b N-P 2 O 5 -K 2 O Target lbs of P 2 O 5 /A Provided by lbs of fertilizer below Compost Triple P Horse Manure (Fresh) Cattle Manure (Fresh) Poultry Manure (50%) Available POTASSIUM from Organic Fertilizer a (per ACRE) Sources Nutrients (lb nutrient/lb material) b N-P 2 O 5 -K 2 O Target lbs of K 2 O/ A Provided by lbs of fertilizer below Compost Sul-Po-Mag Wood Ash c Potash Horse Manure (Fresh) Cattle Manure (Fresh) Poultry Manure (50%) College of Agricultural Sciences Agricultural Research and Cooperative Extension

14 References 1. Orzolek, M.D., et al., Commercial Vegetable Production Recommendations 2010, University Park, PA: Penn State Cooperative Extension. 2. Rudisill, A., Penn State Agronomy Guide , State College, PA: Pennsylvania College of Agricultural Sciences 3. Abawi, G.S., et al., 2010 Production Guide for Organic Cole Crops, A. Seaman, Editor. 2010, Cornell University, New York State Department of Agriculture and Markets, Integrated Pest Managment. 4. Sanchez, E. and T.L. Richard, Using Organic Nutrient Sources. 2009, The Pennsylvania State University: University Park, PA. 5. Osmond, D.L. and J. Kang, Nutrient Removal by Crops in North Carolina, in North Carolina Cooperative Extension. 2008, 6. Clark, A., ed. Managing Cover Crops Profitably. Sustainable Agriculture Network Handbook Series. 2007, Sustainable Agriculture Network: Beltsville, MD. pg 67. Prepared by Tianna DuPont, Sustainable Agriculture Educator, Northampton and Lehigh Counties. Edited by Doug Beegle, PSU Crop and Soil Sciences; Elsa Sanchez, PSU Horticultural Systems Management. 46

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