Experiments conducted with five different rice based cropping systems, two irrigation regimes and two fertilizer levels, at Madurai, revealed that the production of biosynthates viz. carbo hydrate, fat and protein was higher in rice-rice-greengrain, groundnut + blackgram-rice-sesamum and sorghum + vegetable cowpea- rice-soybean systems in that order. The bio-synthates production was higher with irrigation to the rice crop to 5cm depth on the day of disappearance of ponded water and irrigating the kharif and summer crops as 0.75 and 0.60 IW/CPE ratios, respectively. Application of N. P and K as per soil test recommendations recorded higher carbohydrate output in the first year only.
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