EFFECT OF PENDIMETHALIN AND IMAZETHAPYR ON PLANT NITROGEN, NODULATION AND SOIL PROPERTIES IN GROUNDNUT (ARACHIS HYPOGAEA L.)C. Sudharshana and T. Ram Prakash
A field experiment was conducted at college of agriculture, Rajendranagar, Hyderabad in Kharif 2011 to study the persistence of pendimethalin and imazethapyr on nitrogen uptake, nodulation in groundnut crop and soil properties. Application of imazethapyr at double dosage resulted in significantly lower total nodule and active nodule count up to 45 DAS. At 15 DAA (days after application of herbicide), lowest plant N content could be observed in imazethapyr double dose treatment compared to all other treatments was due to herbicide induced phyto-toxicity and consequent less nitrogenase activity. Rhizobium seed inoculation did not significantly change the plant N content at 30 and 60 DAA of herbicide. Application of pendimethalin not adversely affect either total or active nodule count. Usage of Pendimethalin and Imazethapyr at recommended and double the recommended doses did not adversely affect the soil physical (BD, PD, % PS and MWHC), physic-chemical (pH, EC and CEC) and fertility properties (Available N, P and K).
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