World Journal of
Pharmaceutical and Life Sciences

ASSESSING INFLUENCE OF PHOSPHORUS BUILD UP ON THE AVAILABILITY OF ZN NUTRIENT IN SOILS AND ITS FORTIFICATION ON PADDY CROP (ORYZA SATIVA, VAR.MTU-1010) AS DIRECT AND RESIDUAL EFFECT

Shankaraiah Mekala*, Chandini Patnaik Mantri, Surendra Babu Pasupuleti and RamPrasad Mullapudi

ABSTRACT

The continuous and indiscriminate use of P-fertilizers resulted in accumulation of High P-soils throught the state of Andhra Pradesh was estimated to 42 per cent. This affects the availability of zinc to rice crop. Zinc and Phosphorous interaction was to be antagonistic. In view of the increased P-accumulated soils, the information generating on availability of cationic micronutrients in soils and their nutrition is essential to maintain the balanced fertilization to increase the productivity of the crop. Grain yield of paddy in the direct crop ranged from 4.75 to 6.17 q /ha, where as only in foliar spray it was 5.15 q /ha with a mean of 5.54 q /ha, There was significant increase in yields by Zn application over control. There was no significant difference in yields between control (4.75 q /ha), 25 kg ZS/ha (5.24 q /ha) and soil application of 50 kg 25 ZS / ha (5.89 q /ha) and 75 kg ZS / ha (6.05 q /ha). Foliar sprays with 3 rates doses have significant increase over the control. The percent response was varied from 8.67 to 29.89; the highest was at Soil Application of 75-kg ZS/ha + 3-Foliar Sprays treatment. In residual Rabi rice, the yield was ranged from 4.43 to 5.65 q /ha and there was significant increase in the yields from 20 kg ZS /ha to 70 kg ZS /ha along with 3 foliar spray. Straw yields ranged from 5-11 to 6.96 and 4.84 to 6.71 q /ha and response was varied from 10.37 to 36.01 and 7.85 to 38.64 percent. The effect of Zn on residual crop was significant increase in the yields from 20 kg ZS /ha to 70 kg ZS /ha along with 3 foliar spray. The phosphorus content in the grain samples of direct crop ranged from 0.30 to 0.45 per cent. The highest P content was in 75 kg ZS/ha with 3 foliar sprays as well in residue crop( 0.25 to 0.42 per cent). Zinc content in the index leaves increased with increasing in zinc levels from 25 kg ZS to 50 kg ZS as basal and along with foliar sprays in conjunction with soil application both in direct and residual crops over the control i.e. from 14.21 to 22.17 in direct and 14.42 to 17.92 per cent in residual crop where as in foliar sprays, it was increased greatly i.e. from 19.9 to 22.17 in direct and 14.86 to 15.84 per cent in residual crop. The extent of fortification was observed in soil application of 50 kg ZS/ha along with 3-foliar sprays of zinc (56.02) in direct crop.

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