EFFECT OF WEED MANAGEMENT PRACTICES ON WEED DYNAMICS, PRODUCTIVITY AND ECONOMICS OF ORGANICALLY GROWN SWEET CORN (Zea mays L. saccharata)
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Date
2020
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Indira Gandhi Krishi Vishwavidyalaya, Raipur
Abstract
The agronomic investigation entitled “Effect of weed management practices on weed dynamics, productivity and economics of organically grown sweet corn (Zea mays L. saccharata )” was carried out during kharif season of 2018-19. The experimental site was located at the Instructional cum Research Farm, Indira Gandhi Krishi Vishwavidyalaya, Raipur, Chhattisgarh, with the objective to find out the suitable method for weed management in organically grown sweet corn (sugar-75). The field experiment was carried out in randomised block design with three replications having nine different weed management treatments. The soil of experimental field was sandy clay loam in texture with low nitrogen, medium phosphorus and high potassium. It was slightly alkaline in reaction with 7.2 pH.
The finding of the experiment indicated that the growth parameters of sweet corn viz. plant height, number of leaves plant-1, dry matter accumulation and CGR were higher under black plastic mulch treatment as well as yield attributing characters like number of cobs plant-1, weight cob-1, cob length (cm), number of rows cob-1, number of grains row-1, number of grains cob-1 were also higher in black plastic mulch with the yield of green cob and stalk yield 7.6 and 15.44 t ha-1 respectively but green cob yield was found statistically similar with hand weeding at 20 and 40 DAS treatment (7.0 t ha-1) and paddy straw mulch @ 40 q ha-1 (6.8 t ha-1). In the site of experiment major weed flora were Alternanthera sessilis, Cyperus iria and Echinochloa colona some other weeds like Abutilon indica, Celosia argentea, Bracharia remose, Convulvolus arvensis and Cynodon dactylon were also found in the experimental field. There was no incident of weed in the black plastic mulch treatment as mulch restricted the growth of weeds and not allowed to emergence. Highest weed density and weed dry weight was found in weedy check.
Highest net returns (99000 Rs ha-1) and gross returns (677440 Rs ha-1) were found under the black plastic mulch treatment followed by hand weeding at 20 and 40 DAS but the highest B:C ratio were registered under paddy straw mulch @ 40 q ha-1 which was 2.77 followed by hand weeding at 20 and 40 DAS (2.55).
Description
EFFECT OF WEED MANAGEMENT PRACTICES ON WEED DYNAMICS, PRODUCTIVITY AND ECONOMICS OF ORGANICALLY GROWN SWEET CORN (Zea mays L. saccharata)
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