Field experiments were conducted at Tamil Nadu Agricultural University, Coimbatore during rabi and summer seasons of 2007-2008 and 2008-2009 to study the influence of organic manures (enriched farmyard manure compost, vermicompost, farmyard manure + neem cake, enriched farmyard manure compost + vermicompost + farmyard manure, composted poultry manure and enriched poultry manure compost) and recommended NPK fertilizers on yield and quality of rice and blackgram in rice-blackgram cropping sequence. Based on field experiments, it was found that the application of enriched poultry manure compost on equal N basis (2.3 t·ha , which was however comparable with composted poultry manure. The application of recommended NPK fertilizers recorded higher physical characteristics and cooking qualities of rice, which was comparable with enriched poultry manure compost. Higher sensory score was registered in enriched poultry manure compost as compared to recommended NPK through fertilizers. After harvesting of rice, the residual effect of enriched poultry manure compost and composted poultry manure applied to preceding rice crop improved yield attributes and yield of succeeding blackgram.

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Field experiments were conducted for two years at wetland farm, Tamil Nadu Agricultural University, during Kharif seasons of 2014 and 2015 (June to October) to evaluate the penoxsulam (21.7% SC) for weed control in rice. Based on two years data, it was found that pre-emergence application of penoxsulam 22.5 g/ha resulted in significantly lower total weed density, weed dry weight and higher weed control efficiency at all the intervals. Application of penoxsulam could keep the weed density and dry weight below the economic threshold level and increase grain yield of 5.21 and 5.04 t/ha was obtained in 2014 and 2015, respectively. Unweeded control accounted for lower grain yield and higher weed index of 48.7 and 60.8%, respectively.

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Field experiments were conducted to study the effect of potassium and its methods of application in rice, Application of potassium resulted in 33 and 26 per cent increase in grain yield- over control for IR 50 and ADT 36 respectively. Positive influence on growth and yield parameters was observed when the recommended dose of potassium was applied in split doses equally at active tillering and panicle initiation stages.