efficient nitrogen application timing in prune … bill 0lson, l. fitch, d. ramoso j. yeagero k....

EFFICIENT NITROGEN APPLICATION TIMING IN PRUNE PRODUCTION Bill 0lson, L. Fitch, D. Ramoso J. Yeagero K. Uriu, J. Pearson, R. Snyder A lor rate of n'itrogen (i/4 ib/tree) had beenapplied and incorporated via water and/or tillage in a unifonnreplicated three-acre pruneplot at different times of year starting in July 1975. The nigrogen application timings are: Dormant lJan.)., BudSwel l (Mar.), Beginning Shoot crowth (May), ena of Shoot crowth (July), Post Harvest(Sept.), Leaf Fall (Nov.), and an unfertilized iheck. Aften three - complete_years it was found that the l/4 lb. rate of actual nigrogenper tree was too low a rate to differentiate between treated and untreaied treis. Con- sequentlythis year the rate was raised to'l/2 1b. actual nitrogen per tree. No significant difference in yield or other parameters being reasured i^ras observed letween the treatmentsthis year; however, no difference was expected due to the low nitrogen ievel in eachtreatment in 1978. ln 1977 and i978'no correlation existed between yield and nitrogen level in the blossoms, or nitrogen level in the shoots. In 1977and l97B a low positive correlation existed between leaf nitrogen and dry yield.per tree.. These low correlationswere highly sign.ificant in 1977andsigniti- cant ih l978, indicating that therewas a poor ielitioiship between leaf nitrolen and dry yield/tree. The )979 leaf analysis is not availabie at this time. The trial will be continuedfor at least one moreseason with improved imigation timing and at the l/2 lb. of actuai nitrogen/tree. California Dried Plum Board Research Reports 1979 6

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EFFICIENT NITROGEN APPLICATION TIMING IN PRUNE PRODUCTION

Bi l l 0 l son , L . F i t ch , D . Ramoso J . Yeagero K . Ur iu , J . Pearson , R . Snyder

A lo r ra te o f n ' i t rogen ( i /4 ib / t ree) had been app l ied and incorpora ted v ia waterand/or t i l l age in a un i fonn rep l i ca ted th ree-acre prune p lo t a t d i f fe ren t t imesof year s ta r t ing in Ju ly 1975. The n ig rogen app l ica t ion t im ings are : DormantlJan . ) . , Bud Swel l (Mar . ) , Beg inn ing Shoot c rowth (May) , ena o f Shoot c rowth (Ju ly ) ,Pos t Harves t (Sept . ) , Leaf Fa l l (Nov . ) , and an un fer t i l i zed iheck . A f ten th ree

complete_years i t was found that the l /4 lb. rate of actual nigrogen per treewas too low a rate to dif ferentiate between treated and untreaied treis. Con-sequently this year the rate was raised to' l /2 1b. actual nitrogen per tree. Nosignif icant dif ference in yield or other parameters being reasured i^ras observedletween the treatments this year; however, no dif ference was expected due to thelow n i t rogen ieve l in each t rea tment in 1978. ln 1977 and i978 'no cor re la t ion ex is tedbetween y ie ld and n i t rogen leve l in the b lossoms, o r n i t rogen leve l in the shoots .In 1977 and l97B a low posit ive correlat ion existed between leaf nitrogen and dryy ie ld .per t ree . . These low cor re la t ions were h igh ly s ign . i f i can t in 1977 and s ign i t i -can t ih l978, ind ica t ing tha t therewas a poor ie l i t io ish ip be tween lea f n i t ro lenand dry y ie ld / t ree . The )979 lea f ana lys is i s no t ava i lab ie a t th is t ime.

The tr ial wi l l be continued for at least one more season with improved imigationt im ing and a t the l /2 lb . o f ac tua i n i t rogen/ t ree .

California Dried Plum Board Research Reports 1979

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