Chemical control of weeds in dry-seeded rice
2017
Pratap, Tej | Singh, V Pratap | Rekhā,
Rice (Oryza sativa L.) is the principal crop of India cultivated in an area of 43.95 million hactares annually with a production of 106.65 million tonnes, with an average productivity of 2.4 t/ha (Ministry of Agriculture 2015). The conventional system of rice production i.e transplanting under puddled conditions is mainly followed by farmers. However, it is water, labour and energy intensive. Therefore, to assure sustainability of rice production, more resource efficient alternative methods of rice cultivation are needed. The dry seeded rice (DSR) technology being water, labour, energy efficient and having ecofriendly characteristics, received much attention as a potential alternative to transplanting under puddle conditions (Kumar and Ladha 2011). However, weed control is major limitation for the success of DSR as compared to transplanted rice (Chauhan and Yadav 2013). In DSR, weeds emerge simultaneously with crop seedlings and grow more quickly in moist soil than in puddled transplanted rice, resulting in severe competition for resources to the crop. Therefore, weeds present in the field are the main biological constraint to the success of DSR and failure to control weeds result in yield losses ranging from 50 to 90% (Chauhan and Opena 2012). Therefore, an experiment was conducted to study the sequential application of pre- and post-emergence herbicides and their combination along with hand weeding for weed control in dry seeded rice.
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