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Sequential Application of Pre and Post-Emergence Herbicides in Soybean (Glycine max L.)

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Title Sequential Application of Pre and Post-Emergence Herbicides in Soybean (Glycine max L.)
 
Creator Vijayalax G. Sheegihalli
 
Contributor S.M. Hiremath
 
Subject Agronomy
 
Description A field experiment to study the sequential application of pre and post
emergence herbicides in soybean was carried out at Agricultural Research Station,
Bailhongal during Kharif 2010. The experiment comprised of 15 treatments and was
were laid out in RCBD with three replications.
The weed control rating observed after pre and post emergence herbicides
revealed good to excellent control of weeds except in Diclosulam (T1, T4 and T7) and
Quizalofop-p-ethyl (T4, T5 T6 and T11) treated plots. Diclosulam gave moderate
control at 7 DAS but at 14 and 21 DAS it recorded good to excellent control of weeds.
The crop toxicity rating observed after pre and post emergence herbicides revealed
none of the herbicides had any injury on the crop except Quizalofop-p-ethyl.
Quizalofop-p-ethyl treated plots showed deficient to moderate control of weeds as
well as slight discoloration of leaves at 7 and 14 days after post emergence spray.
Weed count and dry weight was significantly lower in T2, T13, T1, T5, T4, T12,
T7, T14 and T11 when compared to weedy check at 30 and 60 DAS. Weed control
index was significantly higher in the former treatments while nutrient removed by the
weeds was least in these treatments. Seed yield was significantly higher in T2, T13, T1,
T5, T4, T12, T7, T14 and T11 than weedy check. The various growth (plant height,
number of nodules per plant, leaf area index and total dry weight), yield (number of
pods per plant, 100 seed weight and seed weight per plant) parameters followed the
trend as recorded in seed yield. The nutrient uptake by crop was also higher in T2, T13,
T1, T5, T4, T12, T7, T14 and T11 than weedy check. The economics of the study revealed
that Oxyfluorfen 0.1 kg/ha fb Imazethapyr 75 g/ha (T2) recorded highest net income
(Rs. 41,030/ha) and benefit: cost ratio (3.18). The treatments namely T13, T1, T5, T4,
T12, T7 and T14 remained on par with T2.
 
Date 2016-11-10T18:37:35Z
2016-11-10T18:37:35Z
2011
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/85012
 
Format application/pdf
 
Publisher UAS, Dharwad