Effect of pre and post emergence weedicides application on nodulation, growth and yield of soybean at different fertility levels
1990
Akhtar, M. (University of Agriculture, Faisalabad (Pakistan). Dept. of Agronomy) | Afghan, S. (Shakar Ganj Sugar Mills, Jhang (Pakistan)) | Mahmood, T. (Ayub Agricultural Research Inst., Faisalabad (Pakistan). Plant Physiology Section) | Abbas, G.
The experiment was conducted at University of Agriculture, Faisalabad during 1986 in a sandy loam soil having 0.03 percent total nitrogen, 22 ppm available phosphorus, 186 ppm available potassium and with a pH value of 8.5. The experiment was laid out in split plot f design with four replications. Plot size measured 1.8 x 7 meter. Crop was sown at 45 cm apart rows. Plant to plant distance was maintained at 10 cm. Results revealed that pre-emergence application of Stomp 330E (3.75 l/ha) and post-emergence spray of Fusilade 4E (4 l/ha) gave about 92 percent weed control. Stomp 330E was found to be a weak herbicide against grasses but more effective against broad leaved weeds than Fusilade 4E and vice versa. Root nodulation was decreased by the toxic effects of both the weedicides. Seed yield was highly correlated with leaf area per plant, number of pods per plant and seed weight. Higher seed yield (1235 kg/ha) was obtained by mechanical weed control treatment. But it was statistically at par with post-emergence application of Fusilade 4E (4 l/ha) 1196 kg/ha). However, economic analysis showed that the later gave higher net benefit.
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