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Integrated weed management in aerobic rice

KrishiKosh

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Title Integrated weed management in aerobic rice
 
Creator SUNIL, C. M.
 
Contributor SHEKARA, B. G.
 
Subject null
 
Description A field experiment en titled "integrated weed management in aerobic rice” w as
conducted during Kharif 2009 at ZARS, V. C. F arm , Mandya. The experimental site was
uniform in topography an d red sand y loam in soil texture. The soil pH was neutral in
reaction and medium in available Nitrogen phosphorus and potassium . The experiment
consisted o f 12 treatments laid out in randomized complete block design with three
replications consisting four pre-emergence herbicides integrated with one inter cultivation
at 40 days after sowing , hand weeding twice at 20 and 40 day s after sowing,
inter cultivation thrice at 20, 40 and 60 days after sowing compared with weed free and
unweeded check. The predominate weed flora observed in the experimental field were,
Echinochloa colonum and Digitaria marginata, Ageratum conyzoides, Spilanthus
acmella, Commelina benghalensis, Celosia argentia, Cypemsiria an d Cyperusrotimdus.
The results revealed that pre-emergence application of Bensulfuron methyl + Pretilachlor
(6.6 GR) @ 0 .0 6 + 0.6 0 kg a.i ha '1 + one inter cultivation at 40 days after sowing recorded significantly Higher g rain yield an d straw yield (442 5 k g ha"1 and 5020 kg ha '1 respectively), lower weed population and their dry weight (17 .0 No. 0.25 /m 2 & 2.32 g
0 .25 /m 2 respectively). The plant growth and yield components viz. plant height (79.10
cm ), leaf area (2175.41 cm 2 h ill'1), total dry matter production (69 .30 g hill'1), number of productive tillers hill'1 (25 .9), weight of panicle (3.80 g), filled spike lets per panicle
(128.60) and 1000 g rain weight (23 .70 g) were significantly higher with the same
treatment. Further the nutrient uptake by the crop (103 .99, 19.28 and 77.71 Kg NPK ha '1)
was maximum and the net returns and B: C Ratio was also high with the pre-emergence
application of Bensulfuron meth y l + Pretilachlor (6.6 G R) @ 0 .06 + 0.60 kg a.i ha '1 + one
inter cultivation at 4 0 day s after sowing.
 
Date 2017-06-28T07:12:36Z
2017-06-28T07:12:36Z
2010-07-15
 
Type Thesis
 
Identifier Th-9595
http://krishikosh.egranth.ac.in/handle/1/5810023598
 
Language en
 
Format application/pdf
 
Publisher University of Agricultural Sciences, Bangalore