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The rainfall data pertaining to 40 years were analysed and contingent crop plan was developed for Trichy district. The annual mean rainfall was 742.02 mm. The distribution pattern of annual rainfall over the 40 years reveals that in 15 years, it was normal (37.5%) and in 10 years, it was deficit (25.0%). Excess rainfall was recorded in 13 years (32.5%). In two years, the rainfall was scanty (5.0%). Among the four seasons, North East monsoon contributes the highest quantity rainfall (47.2%) followed by South West monsoon (37.5%). The sowing rains of 20 mm and above were recorded in the third week of August through the end of the year. Based on the rainfall pattern, suitable crops are recommended for various soil types like red, black and salt affected soils.

Soybean Co.l. raised on Perianaickanpalayam (Typic ustivertept) and Irugur (Typic ustorthent) soil scries at Tamil Nadu Agricultural University Farm, Coimbatore during rabi 1990-91 and kharif 1991-92 respectively responded significantly to Zn fertilizetion at 5.0 kg ha. Combined application of Zn, Mo and FYM at 2.5 kg, 0.5 kg and 10 t ha respectively produced the highest seed yield in both the years besides increasing their content and uptake by soybean seed. The highest Fe uptake by seed during rabi 1990-91 was evidenced with the application of 5.0 kg Zn ha".

Field experiments conducted at the Tamil Nadu Agricultural University, Coimbatore during Rabi 1985-86 and Kharif, 1986 indicated that irrigating at 0.6 IW/CPE ratio throughout the crop period with an application of 80 kg N/ha was found to be most economical for finger millet Co. 11) grown under vertisols. The quadratic polynominal function with water and N as variables was found to be the best.