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Indian Journal of Weed Science
Year : 1999, Volume : 31, Issue : 3&4
First page : ( 191) Last page : ( 195)
Print ISSN : 0253-8040.

Nutrient Uptake by Mustard and Associated Weeds as Influenced by Nitrogen Levels, Planting Geometry and Weed Control Methods

Mishra J. S.*, Kurchania S. P.

Department of Agronomy, Jawaharlal Nehru Krishi Vishwa Vidyalaya, Jabalpur-482 004 (M. P.), India.

* Present Address: National Research Centre for Weed Science, Maharajpur, Adhartal, Jaballpur-482 004, India.

Abstract

A field experiment was conducted at J. N. Krishi Vishwa Vjdyalaya, Jabalpur during the winter seasons of 1996–97 and 1997–98 to study the effect of increasing levels of nitrogen, planting geometry and herbicides on the nutrient removal by mustard and associated weeds. Treatments consisted of combinations of four nitrogen levels (0, 40, 80 and 120 kg/ha) and two planting geometry (uni-and bi-directional sowing) as main plots and two herbicides (isoproturon 1.0 kg/ha and oxadiazon 0.75 kg/ha both as pre-em.) alongwith hand weeding at 30 DAS and weedy check as sub-plots. Results revealed that application of 120 kg N/ha significantly increased seed yield and nutrients (NPK) uptake by crop, whereas their depletion by weeds declined compared to no nitrogen application. Planting geometry failed to affect seed yield and nutrient uptake by crop and weeds. Presence of weeds throughout crop season resulted in 26.5% reduction in seed yield as compared to isoproturon treated plots. At harvest, weeds depleted 41.0, 1.22 and 43.21 kg/ha nitrogen, phosphorus and potassium, respectively, in weedy check as compared to 19.40,0.66 and 21.46 kg/ha in herbicides applied plots.

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