Record Details

WEED MANAGEMENT IN TRANSPLANTED RAGI (Eleusine coracana (L.) Gaertn.)

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Title WEED MANAGEMENT IN TRANSPLANTED RAGI (Eleusine coracana (L.) Gaertn.)
 
Creator KRISHNA PRITHVI, B
 
Contributor SUBRAHMANYESWARA RAO, A
 
Subject storage, apples, fruits, fruit products, acidity, mangoes, papayas, pears, sugar, antioxidants
 
Description A field experiment entitled “Weed management in transplanted ragi (Eleusine
coracana (L.) Gaertn.)” was conducted during kharif, 2011 on sandy soils of
Agricultural College Farm, Bapatla. The experiment was laid out in a randomized
block design with ten treatments comprising of T1-Handweeding twice at 15 and 30
DAT; T2-Pendimethalin @ 0.75 kg a.i. ha-1 at 3-5 DAT as SMA (Sand Mix
Application); T3-Oxadiargyl @ 100 g a.i. ha-1 at 3-5 DAT as SMA; T4-Bispyribac
sodium @ 25 g a.i. ha-1 at 15 DAT; T5-Pendimethalin @ 0.75kg a.i. ha-1 as SMA
followed by bispyribac sodium @ 25 g a.i. ha-1 at 20 DAT; T6- Oxadiargyl @ 100 g
a.i. ha-1 at 3-5 DAT as SMA followed by bispyribac sodium @ 25 g a.i. ha-1 as postemergence
at 20 DAT; T7-Pendimethalin @ 0.75 kg a.i. ha-1as pre-emergence
followed by intercultivation with star weeder at 20 DAT; T8- Oxadiargyl @ 100 g
a.i. ha-1 at 3-5 DAT as SMA followed by intercultivation with star weeder at 20
DAT; T9- Bispyribac sodium @ 25 g a.i. ha-1 at 15 DAT followed by
intercultivation with star weeder at 30 DAT; and T10-Weedy check. The treatments
were replicated three times.
The predominant weed species which infested the experimental plot were
Cynodon dactylon, Panicum repens, Sesamum ekambri, Cyperus bulbosus,
Acanthospermum hispidum, Trianthema portulacastrum, Digitaria marginata,
Mollugo lotoides, Portulaca oleracea, Cleome viscosa, Amaranthus viridis,
Pedalium murex, Abutilon indicum, Physalis minima and Phyllanthus niruri.
Results of the investigation revealed that all the weed management treatments
were significantly superior to weedy check in reducing the weed growth and
increasing the crop growth, yield attributes and yield of transplanted ragi crop.
Among the weed management treatments, the lowest weed density and dry
weight was observed with oxadiargyl@ 100 g a.i ha-1followed by intercultivation at
20 DAT (T8) which was on par with other intercultivation treatments (T7 & T9),
sequential treatments (T5 & T6) and also with hand weeding (T1), at 60 DAT and
harvest which resulted in the highest weed control efficiency.
Among the herbicides under study, post emergence application of bispyribac
sodium @ 25 g a.i ha-1 applied at 15 DAT (T4 & T9) and at 20 DAT (T5 & T6)
caused phytotoxicity to crop (slight stunting, brown discolouration of leaves and
stems). The injury symptoms vanished by 21 days after spraying in case of
application at 15 DAT and by 14 days after spraying in case of application at 20
DAT.
Among the weed management treatments, the highest grain yield (2466 kg
ha-1) was observed with oxadiargyl @ 100 g a.i ha-1followed by intercultivation at
20 DAT (T8) which was on a par with all other integrated treatments (T7 & T9),
sequential treatments (T5 & T6) and also with hand weeding (T1) in which the
highest grain yield (2635 kg ha-1) was observed. Weedy check caused an yield
reduction of 55 per cent over hand weeding treatment.
The nutrient uptake by crop was significantly higher and nutrient depletion
by weeds was significantly lower in hand weeding (T1) compared to weedy check.
Among the herbicidal treatments, the highest N, P and K uptake by crop and lowest
uptake by weeds was observed in oxadiargyl@ 100 g a.i ha-1 followed by
intercultivation at 20 DAT which inturn was on a par with other integrated (T7 & T9)
and sequential treatments (T5 & T6) but significantly superior to alone application of
herbicides (T2 to T4).
The present investigation indicated that all the treatments integrated with
intercultivation (T7 to T9) were found to be effective and comparable to hand
weeding treatment (T2) in getting higher grain yield. However, on considering
economics, pre emergence application of oxadiargyl @ 100 g a.i ha-1 followed by
intercultivation at 20 DAT was found to be effective and economical for managing
weeds in transplanted ragi as an alternative to manual weeding
 
Date 2016-06-22T11:57:27Z
2016-06-22T11:57:27Z
2012
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/67683
 
Language en
 
Relation D9409;
 
Format application/pdf
 
Publisher ACHARYA N.G. RANGA AGRICULTURAL UNIVERSITY