The results of permanent manurial experiment which was started during 1992 reveals that use of gypsum @500 kg/ha along with organics and recommended dose of fertilizer makes the rice plant to withstand adverse environmental conditions such as water logging, iron toxicity, sulphide injury and K deficit condition which are widespread in Cauvery delta region.
For kuruvai , 125:50:50 kg NPK + GM @ 6.25 t ha-1 and gypsum @ 500 kg ha-1 and for thaladi, 150:60:60 kg NPK with FYM @12.5t ha1 and gypsum – higher OC, available N, P and K @ 500 kg ha-1 besides positive balance of N,P & K and higher microbial population.
Drip irrigation at 150% PE throughout the crop period exhibited superior growth, yield parameters and grain yield in rice. In general, rice hybrids performed better than varieties during summer season under drip irrigation. Among the variety/hybrids tested, CORH 3 performed better in terms of higher productivity. This was followed by KRH 2 hybrid and ADT 45.
In Non-Puddled Machine Transplanted Rice, the field is prepared by dry ploughing (using cultivator and rotovator) followed by laser leveling. Irrigation is given to wet the soil and transplanting is done by using transplanter. Irrigation is given by using AWD method.
Maize- Rice- Pulse system is recommended as an alternate cropping system for Cauvery Delta zone.
Sowing rice fallow blackgram 4 to 6 days before paddy harvest with the seed rate of 39 kg ha-1 could be adopted in machine harvesting (chain/ belt type harvester) areas as an alternative to farmers’ practice (sowing 7 to 10 days before paddy harvest with the seed rate of 30 kg ha-1 and manual harvesting).
For rice fallow blackgram, Clodinafop propargyl 8% + Aciflourfen sodium 16.5% @187.5 g ha-1 (or) Propaquizafop 2.75% + Imazethapyr 3.75% @ 125 g ha-1 could be used as an alternative to the existing herbicide molecules viz. Quizalofop ethyl @ 50 g ha-1+ Imazethapyr @ 50 g ha-1.