Effect of seed rates and nitrogen levels in relation to crop residue management on growth and yield of soybean and wheat in bed planted soybean (Glycine max)-wheat (Triticum aestivum) system.

摘要

A field trial was conducted on soybean (var SL 525)-wheat (var PBW-343) in a system during kharif and rabi season of 2006-07 and 2007-08 on loamy sand soil consisting of 12 treatment combinations laid out in split plot design and replicated three times with three bed plantings viz., fresh beds (FB), permanent beds (PB) and alternate beds (FB/PB) in main plots, two crop, residue management, viz., residue incorporation/mulching (R) and no incorporationo mulching (Ro) and two seed ratesitrogen levels viz., 75 kg/ha (S₁₀₀) and 93.75 kg/ha (S₁₂₅)/90 kg N/ha (N₉₀) and 120 kg N/ha (N₁₂₀) in sub-plots. Results revealed that soybean, treatment R recorded significantly higher DMA, higher LAI, and higher root density, higher nodules and dry weight of nodules than R₀. However, S₁₀₀ recorded significantly Sower DMA, lower LAI and significantly higher nodules and dry weight of nodules than S₁₂₅ treatment. FB, S₁₂₅/N₁₂₀ produced similar yields with PB, FB/PB and S₁₀₀/N₉₀ in both crops. The treatment R produced significantly higher seed yield of soybean (22.6 q/ha) than R₀ (20.8 q/ha). In wheat, plant height, DMA, LAI and effective tillers were higher under FB, R and N₁₂₀ treatments than PB, FB/PB, R₀ and N₉₀. However R treatment recorded higher grain yield (41.1 q/ha) than R₀ (40.9 q/ha).