Weed Management in Transplanted Rice: A Review

Agricultural sciences

Rice is an important food crop extensively grown in India. Several factors are responsible for reducing the yield of transplant rice. However, weed infestation is the major threat to productivity of transplanted rice. Weeds by the virtue of their high adaptability and faster growth dominate the crop habitat and reduce the yield potential of the crop. These weeds could be controlled through manual and chemical methods. Manual method is though very common but cost intensive. Herbicides when applied alone is although economical but may have limitation of resistance development shift in weed flora etc. Weeds are one of the major biological threats to higher rice productivity worldwide. Various cultural, biological, physical and chemical practices affect the composition and intensity of weeds in rice fields. Generally, weeds can be controlled through herbicides; nevertheless, chemical weed control is not a sustainable option on a long term. Various agronomic practices such as the use of tolerant cultivars may reduce the weed pressure in rice. Integrated approaches for weed management, emphasizing on the combination of management practices and scientific knowledge, may reduce the economic costs and improve weed control owing to the complexity of the weed community. Herbicides combination of weed control significantly reduced the weed population and their dry weight effectively over weedy check. Among the herbicide application Bispyribac +Almix 20+4 g a.i. ha-1 25 DAT was controlled the narrow and broad leaves weeds very effectively and recorded higher value of weed control efficiency and yield of rice. Therefore, presently there is a need to use high efficacy herbicides in combination coupled with broad spectrum nature to control the complex weed flora in transplanted rice. Also, the combinations of herbicides increase the range of weed control, save time and reduce the cost of cultivation.

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