Assessment of Interactive Effects of Weed Control System under Different Tillage Practices in Soybean [Glycine max (L.) Merrill]”
Loading...
Date
2013
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
MPUAT, Udaipur
Abstract
A field experiment entitled “Assessment of Interactive Effects of Weed Control System under Different Tillage Practices in Soybean [Glycine max (L.) Merrill]” was conducted during kharif seasons of 2007 and 2008 at Instructional Farm (Agronomy), Rajasthan College of Agriculture, Udaipur. The experiment consisted 21 treatment combinations comprising of three tillage (conventional, rotavator and zero tillage) and seven weed control treatments (pendimethalin at 1000 g ha-1 (PE), imazethapyr at 100 g ha-1 (POE), quizalofop-ethyl at 50 g ha -1 (POE), chlorimuron-ethyl at 9 g ha-1 (POE), in-situ mulching 30 DAS and two hand weedings (20 and 40 DAS) and weedy check. The experiment was conducted in split plot design with tillage treatments in main plots and weed control treatments in sub plots and replicated thrice. Tillage treatments significantly affect the weed density and weed dry matter and nutrient depletion 30, 45 DAS and at harvest. Density of grassy weeds and sedges and total weeds increased under zero tillage, and broadleaf recorded highest weed density with conventional tillage. Almost similar trend was observed in weed dry matter and nutrient uptake by weeds. Among the tillage treatments, conventional tillage was significantly superior over rotavator and zero tillage with respect to growth, yield attributes and yields. Conventional tillage also improved the nutrient uptake and quality of soybean crop in comparison to zero tillage.
All weed control treatments reduced weed density, dry matter and nutrient depletion by weeds 30, 45 DAS and at harvest during both the years. Two hand weedings, imazethapyr and in-situ mulching were significantly superior in reducing weed density, dry matter and nutrient depletion by both the categories of weeds 30, 45 DAS and at harvest stages over rest of the weed control treatments. Post-emergence application of quizalofop-ethyl was more effective on grassy weeds and sedges while chlorimuron-ethyl was more effective on broadleaf weeds.
Two hand weedings, imazathapyr and in-situ mulching gave the highest value of growth characters as well as yield attributes which were being statistically superior over other herbicidal weed control treatments and weedy check. All the weed control treatments significantly enhanced seed and stover yields of soybean over weedy check during both the years. On pooled basis, two hand weedings, imazathapyr and in-situ mulching registered 2131, 1886 and 1883 kg ha-1 seed yield, respectively. The enhancement in seed yield increased due to other herbicides by 59.3 to 69.5 per cent over weedy check yield. All the weed control treatments also produced significantly higher stover and biological yield and enhanced the nutrient uptake of soybean and protein and oil content compared to weedy check.
Among the tillage treatments, conventional tillage recorded maximum net returns (` 21946 ha-1) as compared to zero and rotavator tillage. Whereas higher B C ratio 2.38 was recorded with rotavator tillage. Among weed control practices, maximum net returns (` 23242 ha-1) was recorded under two hand weedings which was at par with imazathapyr (100 g ha-1) last recorded B C ratio of 2.50.
Description
Assessment of Interactive Effects of Weed Control System under Different Tillage Practices in Soybean [Glycine max (L.) Merrill]”
Keywords
null
Citation
Choudhari and Porwal, 2013