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STUDIES ON CRITICAL PERIOD OF CROP WEED COMPETITION IN HYBRID MAIZE

KrishiKosh

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Field Value
 
Title STUDIES ON CRITICAL PERIOD OF CROP WEED COMPETITION IN HYBRID MAIZE
 
Creator JITENDRA KUMAR SINGH
 
Contributor PRABHAKARA REDDY, G
 
Subject weeds, drying, maize, crops, grasses, yields, harvesting, sowing, biological competition, dry matter
 
Description Field experiment entitled “studies on critical period of crop weed
competition in hybrid maize “was carried out during rabi 2009-2010 at wet
land farm of S.V.Agricultural college, Tirupati, Andhra Pradesh. The
experiment was conducted in a Randomized Block Design, replicated thrice
with twelve treatments, viz; Weed free condition (WFC) up to 15, 30, 45, 60
and 75 DAS and weed interference (WI) up to 15, 30, 45, 60 and 75 DAS
along with weed free and weedy check. The test cultivar was DHM 117.
The density and dry weight of weeds tended to decrease with increasing
weed free condition up to harvest. The lowest weed density and dry weight
were registered with weed free check. Unweeed check resulted in highest
density and dry weight of weeds. Growth parameters, viz., plant height, leaf
area index and dry matter production, yield attributes, (cob girth, cob length,
cob weight, number of grains cob-1 and test weight), grain yield and stover
yield and harvest index of maize were significantly influenced by varying
periods of weed free and weed interference conditions.
Increasing trend with respect to plant height and dry matter production
was noticed during the crop growing period up to harvest, while leaf area index
increased up to 60 DAS, then declined towards harvest. The highest growth
parameters were realized with weed free check, where as lowest growth
parameters were recorded with weedy check. Plant height was non-significant
at 20 DAS. Maximum dry matter production was noticed with weed free
check, which was however on par with WFC up to 75 DAS.
Yield components viz., cob girth, cob length, cob weight, number of
grains cob-1 and test weight were higher with weed free check, which were
however on par with WFC up to 75 DAS and WI up to 15 DAS. Significantly
higher cob girth was recorded with weed free check. All the yield components
suffered due to competition under weedy check. As regards to the grain yield
and stover yield increasing trend was noticed with increase in weed free
condition up to harvest.
The highest grain yield was registered with weed free check, which was
however on par with WFC up to 75 DAS and WI up to 15 DAS. While stover
yield was significantly highest with weed free check. The lowest grain yield
and stover yields were noticed in unweeded control. Significant deferences
were found with respect to harvest index due to various weed free and weed
interference treatments. The highest harvest index was recorded in weed free
check, which was comparable with WFC up to 75, 60, 45 and 30 DAS and WI
up to 15 or 30 DAS. Weedy check recorded the lowest harvest index, which
was significantly lower than all other treatments.
The highest gross returns were realized with weed free check, which
were closely followed by WFC up to 75 DAS and WI up to 15 DAS. The net
returns were highest with weed free check, which was on par with WFC up to
75 or 60DAS and WI up to 15 DAS. Weed free check recorded the highest B:
C ratio, which was comparable with WFC up to 75 or 60 DAS and WI up to 15
or 30 DAS. Weedy check was resulted in lowest gross returns, net returns and
B: C ratio which was significantly lower than all other treatments.
In conclusion, it can be stated that the most critical period of crop weed
competition in hybrid maize in alfisols of Southern Agro-climatic Zone of
Andhra Pradesh was from 30 to 45 DAS.
 
Date 2016-06-04T13:42:54Z
2016-06-04T13:42:54Z
2010-07
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/66773
 
Language en
 
Relation D8990;
 
Format application/pdf
 
Publisher ACHARYA N.G. RANGA AGRICULTURAL UNIVERSITY