WEED MANAGEMENT IN TRANSPLANTED RAGI (Eleusine coracana (L.) Gaertn.)
KrishiKosh
View Archive InfoField | Value | |
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
|
|