IMPACT OF CROP ESTABLISHMENT AND WEED CONTROL ON DISEASE INFESTATION AND RICE PRODUCTIVITYSimerjeet Kaur, Surjit Singh and Chander Mohan
The experiment was conducted at Students Research Farm, Department of Agronomy, Punjab Agricultural University, Ludhiana (Punjab) during kharif seasons of 2009 and 2010 to study the effect of crop establishment and weed control on incidence and severity of sheath blight disease and grain yield. The results revealed that weed population, weed dry matter accumulation, sheath blight incidence and grain yield did not vary significantly among different establishment methods of direct seeding and conventional puddled transplanted rice. However, these parameters were significantly affected by different weed control treatments. Disease incidence was the maximum when pendimethalin 0.75 kg ha-1 was sprayed as preemergence which was statistically at par with sequential spray of pendimethalin 0.75 kg with azimsulfuron 0.020 kg ha-1. Disease incidence was significantly lower in weed free and sequential application of pendimethalin 0.75 kg with bispyribac 0.025 kg ha-1. The maximum grain yield was recorded in weedfree treatment which was at par with sequential use of pendimethalin 0.75 kg ha-1 with bispyribac 0.025 kg or azimsulfuron 0.02 kg ha-1.
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