Response of burley tobacco (Nicotiana tabacum L. Var Ky 10) to different weed control methods and nitrogen levels
1990
Masangkay, R.F.
The experimental design used was split randomized complete block design with four replications. Nitrogen levels (0, 60, 120, 180, and 240 kg N/ha) served as main-plots and weed control methods (butachlor (2.0 kg ai/ha), pendimethalin (1.5 kg/ha), and thiobencarb (2.0 kg/ha) applied at 1 DBT fb [day before transplanting followed by hilling-up at 30 DAT days after transplanting], shallow hilling-up at 14 and 30 DAT, handweeding until DAT and unweeded) served as subplots. Weeds should be controlled with the application of nitrogen in tobacco fields. The interaction between nitrogen levels and weed control methods significantly affected agronomic characteristics (length, and width of the tenth leaf, plant height, and days to flower) and yield components (number of harvested leaves and cured yield). Pendimethalin fb hilling-up at 30 DAT required the minimal nitrogen level (60 kg N/ha) to produce the longest leaves and induce flowering which is important for the purpose of seed production. Moreover, it needed 180 kg N/ha to produce the highest cured yield. Butachlor fb hilling-up at 30 DAT needed the minimal nitrogen level (60 kg N/ha) to produce the most harvested leaves and tallest plants and 120 kg N/ha to produce the broadest leaves. Pendimethalin fb hilling-up at 30 DAT gave a satisfactory control of broadleafweeds, grasses, and sedges. This treatment also gave the highest net income and consequently, highest returns with the application of 120 kg N/ha. The best quality tobacco leaves were obtained from plots where weed control methods were employed except for handweeding until 30 DAT and nitrogen levels from 120 to 240 kg N/ha.
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