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Abstrakt

Diagnosis the occurrence of green algae and management in low land paddyfields of Cauvery delta zone, Tamil Nadu

M. Jeya Bharathi*

Rice is a prime food crop for Asian countries. Wet land rice cultivation contributes maximum grain yield than dry land rice. Cauvery delta is a predominant area for rice cultivation in Tamil Nadu. Green algae growth during Kuruvai (June - August) season is a serious problem in wet land rice. The green algae prevent the root respiration and avoid root standing. Laboratory and field experiments were conducted to find out the remedial measures. The results of soil and water analyses showed that use of bore well water and dumping of phosphatic fertilizers leads to salt accumulation which favours the algal growth. The results of the laboratory experiment revealed that the CuSO4, londox power, propiconazole and hexaconazole showed moderate inhibition on 5th day after treatment. The findings from field experiment indicated that use of conoweeder and CuSO4 drenching at the rate of 2.5 kg/ha when green algae appearance has just noticed or 5.0 kg/ha when severe growth occurred is effective in managing the green algae. Biofertilizers application, crop rotation, green manure trampling to be practised to control the algae growth not rectified by CuSO4 application.