Field Evaluations of Liquid Organic Fertilizers on Strawberries, Mark ...

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Field Evaluations of Liquid Organic Fertilizers on Strawberries, Mark ...

ong>Fieldong> ong>Evaluationsong> ong>ofong> ong>Liquidong> ong>Organicong>ong>Fertilizersong> on StrawberriesMark GaskellFarm Advisor – Santa MariaUniversity ong>ofong>CaliforniaCooperativeExtension


Overview – in-season organic fertilization• Need efficient fertilization practices- materials uncertain, changing- lack solubility• Need mineralization for plant uptake- biological process• Commercial organic N fertilizers- dry bulk, + pelleted- liquidUniversity ong>ofong> California Cooperative ExtensionSanta Maria, CA


Concentrate on Nitrogen• Nitrogen is ong>ofong>ten most critical limiting factor• Nitrogen status is shifting• Phosphorus, potassium less problematic- composts, powdered, granular, liquid, etc- tend to accumulate in soils- can apply preplant incorporated – useeconomical materials, manage long term• Preplant N gone after 6-8 weeksUniversity ong>ofong> California Cooperative ExtensionSanta Maria, CA


Rate ong>ofong> N Miner ralization and Nitrog gen Uptak kePre‐plant organicmaterialmineralizationCrop N demand0 2 4 6 8 1011416 1820Week2... .Time


Rate ong>ofong> N Miner ralization and Nitrog gen Uptak kePre‐plant organicmaterialmineralizationSouthernDistrictsStrawberryCrop N demandNorthernDIstricts0 2 4 6 8 1011416 1820Week2Will need periodic (weekly(?)organic N injection. . . .Time


Seasonal Nitrogen Accumulation for Celery) f N (lb/ A)ulation ong>ofong>AccumuCompare to corn?20-25 ppm nitrate-N?Days After Transplanting


Slide 10MG2chek stby numbersMark Gaskell, 12/25/2008


Weekly residual soil nitrate-N at varyingweekly organic N fertigation rates2008 Season – Santa Maria


Total Strawberry Vegetative N & Residual Soil Nitrate- Nat Different Weekly ong>Organicong> N Fertilization RatesManzanita Ranch -Santa Maria, 2008Residual SoilNitrate- N (ppm) /Total Vegeta ative N (lbs/A /Acre)


Accumulation ong>ofong> strawberry plant fresh weight at varying ratesong>ofong> weekly organic N fertigation


Accumulation ong>ofong> strawberry plant dry weight at varying ratesong>ofong> weekly organic N fertigation


Total Fr ruit Yield (g gram/plot)200015001000500Weekly strawberry production from plots receiving varyingrates ong>ofong> weekly organic N fertigationSanta Maria, CA – 2008 Season12 lb N6 lb N3 lb N0


To otal comm mercial yi ield (lbs/A Acre)38000360003400032000300002800026000240002200020000ong>Organicong> strawberry total fruit yield in plots receiving varyingrates ong>ofong> organic N fertigationSanta Maria, CA – 2008 SeasonWeekly N(lb)Applied SeasonTotal (lb)Cost / Unit($/ lb N)Season Cost($/A)3 90 6 5406 180 6 108012 360 6 216018 540 6 32403 6 12Weekly N Fertigation (lbs N /acre)


25Weekly average strawberry fruit weight from plots receivingvarying rates ong>ofong> weekly organic N fertigationSanta Maria, CA – 2008 Season20Average Fruit Weight(g)1510512 lb N6 lb N3 lb N026-Mar 26-Apr 26-May 26-Jun 26-Jul


1614121086420Soil residual nitrate-N following application ong>ofong> varying rates ong>ofong> organic N fertigationSanta Maria, CA - 2009 Season18 lbs/A/wk12 lbs/A/wk6 lbs/A/wkResidual soil nitrate N (ppm)24-Nov-041-Dec-048-Dec-0415-Dec-0422-Dec-0429-Dec-045-Jan-0512-Jan-0519-Jan-0526-Jan-052-Feb-059-Feb-05Date


1614Weekly residual soil nitrate- N at varyingweekly organic N fertigation ratesSanta Maria, CA – 2009 SeasonAgrolizerSoil Resid dual NitrateN (ppm)12108642018 lbs/A/wk12 lbs/A/wk6 lbs/A/wk1/5/09 1/13/09 1/20/09 1/27/09 2/3/09 2/10/09Sample Date


Residual Soil NitrateN (ppm)121086420Weekly residual soil nitrate N following application ong>ofong> varying ratesong>ofong> weekly organic N fertigationNitriboost18 lbs/A/wk12 lbs/A/wk6 lbs/A/wkSample Date


Soil Nitrate – N Sampling?


SummaryIn-season organic strawberry fertilization• No apparent effect ong>ofong> preplant compost.• Challenge is to match N availability with crop demand.• Diverse liquid organic fertilizers but little known about mostefficient materials, rates, timing ong>ofong> applications.• Strawberries have little appreciable N uptake until.mid –February (12 weeks post transplant) in Santa Maria.• Plant growth and yield directly related to weekly applied Nin the range ong>ofong> 3, 6, 12 lb N per acre week.• Current trials confirming soil and plant parameters withexpanded range ong>ofong> materials and fertigation rates.University ong>ofong> California Cooperative ExtensionSanta Maria, CA


ong>Fieldong> ong>Evaluationsong> ong>ofong> ong>Liquidong> ong>Organicong>ong>Fertilizersong> on StrawberriesMark GaskellFarm Advisor – Santa MariaUniversity ong>ofong>CaliforniaCooperativeExtension


Resi idual soil nitrate-N (p ppm)180160140120100806040200Weekly residual soil nitrate-N at varying in-seasonN fertilization rates (CAN 17)Begin FertigationRainy period10 lb N5lbN2.5 lb NSampling Date


Weekly Residual Soil Nitrate-N at Varying WeeklyN Fertigation Rates (CAN 17)-Residu ual Soil Nit trate N (pp pm)25201510510 lb N5 lb N2.5 lb N0 Pre-plant0Date

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