Fertilizer Management in Strawberry Production - Tim Hartz
Fertilizer Management in Strawberry Production - Tim Hartz
Fertilizer Management in Strawberry Production - Tim Hartz
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2010 <strong>Strawberry</strong> field monitor<strong>in</strong>g studies :- Field survey to monitor strawberry nutrient uptake,and grower irrigation and fertilization practices- Field survey to revise leaf and petiole nutrientconcentration standards
Vegetative N content(lb/acre)120100806040200SM-1SM-2WS-1WS-22/1 3/4 4/4 5/5 6/5 7/6 8/6 9/6DateIn Santa Maria, total seasonal vegetative N uptakeappears to be about 120-140 lb N/acre
Nutrients <strong>in</strong> strawberry fruit :Each ton of fruit conta<strong>in</strong>s approximately:- 2.5 lb N- 4.0 lb K- 0.6 lb PIn a 30 ton/acre average yield, with 15% culls :- 90 lb N- 140 lb K- 20 lb P
Approximate seasonal crop nutrient uptake :Total crop uptake (lb/acre)N P KPlant 130 20 90Fruit 90 20 140Total 220 40 230Daily uptake / acre dur<strong>in</strong>g active growth is about :- 1.2 lb N- 1.2 lb K- 0.2 lb P
Preplant fertilization :Do you need P and K ?How much controlled release N is needed ?Which fertilizer has the best release rate ?
Many vegetable soils are high <strong>in</strong> P and K :Field Olsen P (PPM) Exchangeable K (PPM)1 27 752 32 483 33 1174 43 995 62 1986 64 1917 71 1848 75 1939 76 6810 79 11711 83 26912 103 232
4/180604020012/11/12/13/1For Agriform 18-8-13 <strong>in</strong> Watsonville,buried November 4 :% CRF weight loss
Manag<strong>in</strong>g fertigation :Crop uptake is about 1.2 lb N/acre per day• Controlled release N decl<strong>in</strong>es after March• Irrigation water can supply a significant amount of N :over the season, water can deliver- 30 to 40 lb N/acre @ 10 PPM NO 3 -N- 60 to 80 lb N/acre @ 20 PPM NO 3 -N• Only a modest amount of fertigation shouldbe necessary
How are strawberry growers manag<strong>in</strong>g fertilizer ?N applied (lb/acre)350300250200150100500FertigatedPreplantAve28252321191715131197531Field
How does N fertilization rate affect yield ?Relative yield(% of best field)1201008060400 100 200 300 400Preplant N rate (lb/acre)
Leaf nutrient concentration trends over the season :% leaf N4.03.53.02.52.01.51.0NK1 2 3 4 5Sample date
2010 ‘Albion’ leaf nutrient concentration at midseason :Critical valueUC Pub. 40982010 fieldaverage% Nitrogen 2.80 2.66% Phosphorus 0.10 0.36% Potassium 1.00 1.57% Calcium 0.30 1.40% Magnesium 0.20 0.34PPM Z<strong>in</strong>c 20 18PPM Manganese 30 245PPM Iron 50 120Conclusion: current ‘critical values’ need revision
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