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STUDIES ON EFFICACY OF UREA NITRIC PHOSPHATE FOR SUNFLOWER (Helianthus annus L.) IN "SLIGHTLY ACIDIC SOIL

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03-09-95
Patil, Dr.A.S | Pawar, Dr.V.S | Sonar, Dr.K.R
MAHATMA PHULE KRISHI VIDYAPEETH RAHURl, 413 722 DIST- AHMEDNAGAR. Maharashtra State (India)
Soil Science
M.Sc

A p o t c u l t u r e experiment was conducted d u r i n g t h e year 1993-94 a t t h e Department of A g r i c u l t u r a l Chemistry and Soil S c i e n c e , Post-Graduate i n s t i t u t e , Mahatma Phule K r i s hi Vidyapeeth, Rahuri, t o study t h e e f f i c a c y of u r e a n i t r ic phosphate (UNP), t h e new complex f e r t i l i z e r developed by R a s h t r i y a Chemical and F e r t i l i z e r Corporation, Bombay on n u t r i e n t u p t a k e , dry m a t t e r and g r a i n y i e l d of sunflower (Var. Morden). The r e l e a s e of NH+4-N and NO¬3-N from d i f f e r e nt f e r t i l i z e r s and r e s i d u a l e f f e c t on maize was a l s o s t u d i e d. The r e s u l t s of i n c u b a t i o n study r e v e a l e d t h a t t he r e l e a s e of NH+4--N was found t o be h i g h e s t in t r e a t m e n t u r ea t h r o u g h o u t t h e i n c u b a t i o n p e r i o d followed by t h e t r e a t m e nt ammonium n i t r o p h o s p h a t e (ANP). The r e l e a s e of NO¬3-N was found t o be h i g h e s t in t r e a t m e n t ANP t h r o u g h o u t t h e incubat i o n p e r i o d . The t r e a t m e n t u r e a found t o be second h i g h e st i n r e l e a s i n g NO¬3-N in s o i l followed by UNP ( 1 9 : 1 9 : 0 ) . The lowest r e l e a s e of NO"-N was observed in UNP ( 2 7 : 9 : 0 ). The r e s u l t s of t h e pot c u l t u r e experiment r e v e a l e d t h at sunflower showed s u b s t a n t i a l response t o t h e a p p l i c a t i o n of UNP. Amongst t h e d i f f e r e n t f e r t i l i z e r t r e a t m e n t s , t he t r e a t m e n t r e c e i v i n g f u l l recommended dose of N and P through UNP (27:9:0) was found to be efficient in increasing grain yield per plant, number of grains head" and per cent of filled grains head"" , while the treatment receiving full recommended dose of N and P through urea and SSP found to be efficient in dry matter production. The treatments receiving full recommended dose of N and P through UNP (19:19:0) and ANP (23:23:0) proved to be better in influencing plant height at all the stages of crop growth. Nitrogen applied to sunflower through urea was found to be efficient in uptake of N at 30 ,and 45 day of crop growth while at 15 day, the highest uptake of N was observed in treatment receiving full recommended dose of N and P through UNP (19:19:0), The treatment receiving full recommended dose of N and P through UNP (27:9:0) found to be efficient in uptake of N at harvest. The uptake of P by the sunflower was found to be enhanced by the treatment receiving full recommended dose of N and P through urea and SSP at 15 ,30 and 45 days of crop growth. At harvest, the treatment receiving full recommended dose of N and P through UNP (27:9:0) was found to be efficient. The uptake of K by the sunflower was found to be enhanced by the treatment urea at the earlier growth stages (i.e. up to 45 day), while at harvest, the treatment receiving full recommended dose of N and P through UNP (27:9:0) was found to be efficient in enhancing K uptake by sunflower. In residual studies, the treatment receiving full recommended dose of N and P through urea and SSP was found t o be efficient in dry matter production and uptake of N by maize at 65 day after sowing. However, treatment receiving full recommended dose of N and P through UNP (27:9:0) proved t o be efficient in uptake of K by raaize at harvest.

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