Chemical weed control in corn (Zea may Linn.) with different methods of soil preparation
Tawee Sangthong1 and Weerawat Nilrattanakoon2
………………………………
Field trial on effects of chemical weed control in corn (variety Nakhonsawan 2) with different soil preparations was conducted in Nakhonsawan Field Crops Research Centre, Nakhon Sawan province in rainy season (May – November) 2002. In the early season, mungbean (variety Chinat 36) was grown with conventional tillage. After mungbean harvesting, corn growing experiment as split plot designed with 3 replications was started. Main plot was 4 soil preparations, consisted of one plough and two ploughs before seeding, no tillage with sprayed pre-planting glyphosate herbicide and no tillage with cutting mungbean plants as mulching. Four subplots were pre-emergence treatments of alachro+atrazine tank-mixed, dimethanamid, alachro+glyphosate tank-mixed and no weed control which were done the same after crop seedings. The results showed that there were statistical relations of weed control efficacy and weed dry weights between methods of soil preparation and weed control treatments. Chemical weed control with 1 or 2 plough provide better weed control than that of herbicide weed control with no tillage. For no tilled corn, tank-mixed of alachro+glyphosate showed satisfactory weed control. There were no statistical difference on height, pod number/plant of corn among weed control treatments and among soil preparations but there were differences of grain yields between herbicide weed control treatments and no weed control in each soil preparation. The resulted also showed that corn yield from 1 or 2 plough treatments with promising herbicide weed control treatments. From this experiment, total incomes were also discussed.
weedcontrol