Effect of herbicides on soil dehydrogenase and urease activity in soybean (Glycine max)

Effect of herbicides on soil dehydrogenase and urease activity in soybean (Glycine max)

2000

A:PS

A field experiment was conducted on a clay loam soil in Madhya Pradesh, India, during the rainy season of 1996-97. The following herbicides were applied to soyabean: pre-emergence alachlor (2 kg a.i./ha); pendimethalin (1 kg/ha); pre-plant incorporation of trifluralin (1 kg/ha); post-emergence anilofos (1.5 kg/ha); fenoxaprop-P (50 g/ha); propaquizafop (50 g/ha); and imazethapyr (75 g/ha). Propaquizafop and imazethapyr had no significant effect on soil dehydrogenase activity. Application of alachlor, propaquizafop and imazethapyr stimulated urease activity, while fenoxaprop-P had no significant effect. Anilofos showed the maximum inhibition of soil dehydrogenase and urease activity. Soyabean seed yield increased most with the application of propaquizafop (1490 kg/ha) in 1996 and with imazethapyr (2150 kg/ha) in 1997. Seed yield had positive association with dehydrogenase and urease activity.

v.70(4):218-219, INDIAN JOURNAL OF AGRICULTURAL SCIENCES

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