8 !! Watermelon Transplant Size: Watermelon Transplant Size: Yield (t/acre) Cell Size Early Total
9 Watermelon Transplant Depth: - "soil line vs cotyledon - 3 years deep-setting tended to increase early yield deep-set plants appeared more vigorous depth did not influence total yield Vavrina, U of Fla.
10 Watermelon Transplant Age: Watermelon Transplant Age: - 2 locations age of transplant did not affect early or total yield or fruit size Vavrina, U of Fla.
11 Vavrina - 3 cell sizes (50, 73, 135 cell) - 3 years, et al., U of Fla. neither age of transplant nor cell-size affected early or total yield or fruit size Vavrina, et al., U of Fla.
12 Growing Better Melons: Varieties
13 45 40!""#$%&'()*(+,-$./(+0$ Yield tons/a Clough, OSU
14 1998 Seedless Watermelon Production Cultivar Yield (ton/acre) Soluble Solids (%) Fruit Wt (lbs) Carousel Crimson Jewel Honey Heart King of Hearts Nova Palomar Summer Sweet Summer Sweet 3521Y Clough, OSU
15 1998 Seedless Watermelon Production Cultivar Yield (ton/acre) Soluble Solids (%) Fruit Wt (lbs) Summer Sweet Summer Sweet SWX SWX SWX SWX Tri-X Clough, OSU
20 2009 Seedless Watermelon Production Cultivar Yield (ton/acre) Soluble Solids (%) Fruit Wt (lbs) HQ HQ Crunchy Red F Melody Super Crisp Sweet Delight Tri-X Tri-X Waters & Clough
21 Growing Better Melons: Mini- or Personal Varieties
24 Seedless Mini-Watermelon Production Cultivar Yield (ton/acre) Soluble Solids (%) Fruit Wt (lbs) Fruit/ Acre Extazy Liliput MiniTriploid MiniTriploid MiniTriploid Petit Perfection* RWT Molinar & Mueller, 2003
26 Organic Seedless Mini-Watermelon Production Cultivar Yield (ton/acre) Soluble Solids (%) Fruit Wt (lbs) Fruit/ Acre Bibo Little Deuce Coupe Mini Yellow Petit Perfection Poquito Precious Petit RWT Valdoria Vanessa Drip irrigation, black polyethylene mulch, California Molinar, Mueller, & Yang, 2006
27 Seedless Personal Watermelon Production Cultivar Yield (ton/acre) Soluble Solids (%) Fruit Wt (lbs) Fruit/ Acre Bibo Petit Perfection Precious Petit RWT Drip irrigation, black polyethylene mulch, conventional, Indiana Gunter, et al., 2005
29 Seedless Mini-Watermelon Production Cultivar Yield (ton/acre) Soluble Solids (%) Fruit Shape Xite Mohican Petite Perfection Average 4 locations, 5 in-row spacings Hassel et al, 2009
30 Seedless Mini-Watermelon Production In-row Spacing Plants 1000/acre Ton/acre Fruit Yield 1000/acre Average of 4 locations, 3 cultivars Hassel et al, 2009
31 Seedless Mini-Watermelon Production Cultivar Yield (ton/acre) Soluble Solids (%) Hollow Heart Colored Seed Betsy Petit Treat Valdoria Vanessa Average 6 in-row spacings Walters, 2009
32 Seedless Mini-Watermelon Production In-row Spacing Plants 1000/acre Ton/acre Fruit Yield 1000/acre Average of 4 cultivars Walters, 2009
33 Seedless Mini-Watermelon Production In-row Spacing Costs ($/acre) Net Revenue Local Wholesale 6 10,892 $28,310 $4, ,008 $20,260 $2, ,240 $18,490 $2, ,568 $15,060 $1, ,182 $14,490 $1, ,778 $ 7,121 -$1,219 Average of 4 cultivars Walters, 2009
36 Growing Better Melons: Crop Nutrition
37 Nutrient Availability & Effectiveness: Fixation - phosphorus Leaching - NO 3 -N, K, B Volatilization - urea"nh 3 # Competition - soluble salts ph - optimum 6-6.5: Ca, P, Mg deficient < 6 Fe, P deficient > 7
38 Requirements: Preplant soil test - quick, inexpensive - very general, field variability - "calibrated" to soil type
39 Application Rate: Readily available - production guides - usually for maximum yields - adjust for expected yield reduced growth! reduce rates
40 Fruit removal: w / 40 ton / acre yield (80000 lb) (7.5% DM) (3% N) = 180 lb N / acre (80000 lb) (7.5% DM) (0.5% P) = 30 lb P / acre = 68 lb P 2 O 5 / acre (80000 lb) (7.5% DM) (2.5% K) =150 lb K / acre
41 Requirements: Tissue analysis - more expensive - slow turn-around time - indicates plant nutrient status - sampling more difficult Plant sap quick-tests - very quick - accurate
42 4.,.E&( Plant tissue analysis at early bloom stage for watermelon.( F( G( H( 9,( I/( 4( Fe Mn Zn B Cu Mo G02(%0-.(JKL( G,2.&(#02(7$33$"-(J##7L( Deficient < Adequate High > Maynard, U Fla
44 Sufficiency ranges for petiole sap testing for watermelon. Crop development stage Fresh petiole sap concentration (ppm) NO 3 -N Vines 6 long Fruits 2 long Fruits one-half mature At first harvest K Maynard, U Fla
45 Nutrition X Irrigation Movement, redistribution and accumulation of soluble nutrients are influenced by irrigation application. Nutrients move w/ wetting front as water moves through soil.
46 Application w/drip: Broadcast (in bed) and Incorporate: % of N & K and 100% of P and micronutrients. Fertigate: - remainder of N & K as crop develops.
47 Application w/drip: Fertigation: - apply nutrients in 1 st part of irrigation cycle - chemigate near end of cycle to prevent algae growth, precipitation etc.
48 Application w/drip: Foliar - application of nutrients directly to the leaves. - large amounts of nutrients cannot be applied w/o injury to plant. - may be very effective with micronutrients, especially if soil ph is alkaline.
49 Nutrient Sources: Nitrogen - at least 50% as N0 3 -N in cool or fumigated soils. NH 4 N0 3 Ca(NO 3 ) 2 KNO 3 NaNO 3 (Na may contribute to salts)
50 Nutrient Sources: Phosphorus - ordinary super phosphate (OSP) and triple super phosphate (TSP) are good P sources (more S and Ca w/ OSP). - diammonium phosphate (DAP) may precipitate micronutrients.
51 Nutrient Sources: Potassium - KNO 3 - K 2 SO 4 - KCl (high salt index) - K 2 SO 4!2MgSO 4
63 2002 Columbia Basin Fumigation trials Verticillium wilt (Verticillium dahliae) Fumigant Plant Loss (%) Telone C b Inline 0.7 b None 3.2a
64 2002 Columbia Basin Fumigation trials Wireworm (Limonius canus, L. californicus) Fumigant Plant Loss (%) Telone C b Inline 4.8 b None 26.6a
65 Implementation of Risk Mitigation Measures for Soil Fumigant Pesticides Buffer zones (2011): - application rate - field size - application equipment and methods - emission-control measures (tarps) Telone: no buffer required others: minimum 30 up to 300
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