Effects of organic and inorganic sources of nutrition on growth and yield of soybean in soybean-wheat sequence

摘要

The field experiment was initiated during Kharif 1996 by keeping organic (pure), integrated (partial) and chemical farming systems. On the same field the present investigation (2000-01 and 2001-02) was conducted atthe experimental farm of the Department of Agronomy, Punjab Agricultural University, Ludhiana on sandy loam soil. In soybean-wheat sequence, FYM application (5)10 t/ha to soybean and 20 t/ha to wheat along with incorporation of residues, Recommended levels of chemical fertilizers along withincorporation of residues and green manuring of sunnhemp (Crotalaria juncea) gave 18.0 and 13.7% higher soybean seed yield, respectively than the recommended chemical fertilizer treatment (16.57 q/ha). The full and partial organic farming treatments showed discernible edge in the yield attributing characters, periodic photosynthetically active radiation interception, plant height, drymatter accumulation, leaf area index over alone chemical fertilizer treatments. The nodule count and their dry weight and root density was significantly more where as the soil and canopy temperature was less in sole partial organic farming treatments as compared to alone chemical fertilizer application.