Crop Weed Competition for Nutrients By Weeds and Drill Sown Finger Millet [Eleusine Coracana (L.) Gaertn.]

摘要

A field experiment was carried out on red sandy loam soils of Zonal Agricultural Research Station, V. C. Farm Mandya, Karnataka during late kharif, 2013 to investigate the effect of chemical weed management practices on nutrient uptake by weeds and drill sown finger millet. The results revealed that pre-emergence application of Bensulfuron methyl (0.6% G) + Pretilachlor (6.0 % G) @ 10 kg ha~(-1) recorded significantly lower weed population (20.33 per 0.25 m2), weed dry weight (7.56 g per 0.25 m2) andnutrient uptake by weeds (8.2, 3.3 and 6.3 kg NPK ha~(-1), respectively) as compared to unweeded check (172.33 no. per m2,58.44 g per m2 and, 49.1,14.0, 32.7 kg NPK ha~(-1), respectively). However, pre-emergence application of Bensulfuron methyl (0.6 %G) + Pretilachlor (6.0 % G) at 7.5 kg ha~(-1) recorded significantly higher grain and straw yield (3291 and 5208 kg ha~(-1), respectively) and nutrient uptake (72.5, 16.1 and 56.7 kg NPK ha~(-1), respectively) by drill sown ragi. Whereas, the net returns(Rs.42338 ha~(-1)) was higher with the pre-emergence application of bensulfuron methyl (0.6 % G) + pretilachlor (6.0 %> GR) at 7.5 kg ha~(-1) as compared to unweeded check (Rs.-2602 ha~(-1)). From the studies it can be concluded that pre-emergence application of Bensulfuron methyl (0.6%, G) + Pretilachlor (6.0 % G)@10 kg ha~(-1) reduced the weed competition for nutrients as a result of this the grain yield and nutrient uptake by crop was more.