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The objective of this research was to find out the impact of zinc and organic fertilization on the productivity of rice. Two separate field experiments were conducted in a zinc deficient soil belonging to Typic Haplusterts and Typic Ustifluvents during Rabi 2011-2012. The results revealed that grain and straw yield was significantly enhanced on addition of zinc or organics or both over control in both soils. The rice yield increased with zinc doses and maximum yields was noticed with 5 mg Zn kg-1 and declined at 7.5 mg Zn kg-1. While addition of poultry manure recorded the maximum rice yields and was on par with vermicompost. However the highest grain yield (6103, 6344 kg ha-1) and straw yield (8369, 8459 kg ha-1) was recorded with application of 5 mg Zn kg-1 and poultry manure in Vertisol and Entisol respectively. Similarly, addition of 5.0 mg Zn kg-1 along with poultry manure @ 10 t ha-1 registered the highest growth traits it was comparable with vermicompost at same level of zinc, but superior to other treatment combination.

Aim: Assess the effect of silicon and nitrogen application on chemical nutrition of plant and soil grown in Typic Ustifluvent soil Study design: Factorial RBD Place and duration of study: Field experiments was conducted in farmers holding in Kuttalam Block, Mayiladuthurai district. The experiment was conducted for two seasons Methodology: Field experiments was conducted in farmers holding during kuruvai and samba seasons to. The treatments consists of silicon levels viz., 0, 50,100 and 150 kg ha-1 and nitrogen levels viz., 0, 50,100, 150 kg ha-1. using rice as test crop var. ADT43 and CR1009.The grain and straw yield was recorded at harvest. The grain and straw samples were analyzed for nutrient contents and corresponding uptake was calculated. The soil samples were analyzed for nutrient status at different physiological stages. Results: The result revealed that graded doses of nitrogen and silicon applied alone or in combination caused significant improvement in rice yield over control. The rice yield reached its pinnacle (5600, 6786 kg ha-1) and straw yield (6811, 8031 kg ha-1) was noticed with 150 kg N ha-1 + 150 kg Si ha-1. However it was comparable with 150 kg N ha-1 + 100 kg Si ha-1 and 100 kg N ha-1 + 150 kg Si ha-1. The uptake increased with nitrogen and silicon levels. The highest nutrient uptake was recorded with 150 kg N ha-1 + 150 kg Si ha-1. It was comparable with 150 kg N ha-1 + 100 kg Si ha-1. Available nitrogen, phosphorus, potassium, and silicon increased with N and Si levels. The highest available N, P, K and Si was maximum when nitrogen and silicon was applied at 150 kg ha-1. Conclusion:  Conjoint application of 150 kg N ha-1 and 150 kg Si ha-1 recommended to realize maximum yield of rice grown in soil low nitrogen and silicon

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