STUDIES ON THE METHOD AND TIME OF APPLICATION OF SOME PROMISING HERBICIDES FOR WEED CONTROL IN GROUNDNUT (Arachis hvpo9aea L.)
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Title |
STUDIES ON THE METHOD AND TIME OF APPLICATION OF SOME PROMISING HERBICIDES FOR WEED CONTROL IN GROUNDNUT (Arachis hvpo9aea L.)
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Creator |
Sivannarayana, G
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Contributor |
Bhanumurthy, V.B
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Subject |
Studies,method,time,application,promising herbicides,weed control,groundnut
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Description |
Two experiments were conducted during Kharif, 1988 and one during summer, 1988-89 to findout the most effective chemical weed control practice for groundnut using some of the available herbicides. During Kharif, 88, in one experiment four herbicides (fluchloralin, pendimethalin, 2,4-D EE and alachlor) were tested in main plots with their time and method of application (PPI, Preemergence spray, early postemergence spray and with soil} treatments as subplots. In another experiment, fluchloralin was tested for preemergence as well as early post emergence use and was applied using sand, soil, urea, and water as carriers. Its early postemergence spray was incorporated by way of star weeding. All these treatments were compared with preplant incorporation (P.PI) of fluchloralin, hand weeding twice, star weeding twice and unweeded check. Keeping the observations of the above trials in view, the experiment for summer 188-89 was formulated. The treatments included preemergence use of fluchloralin with soil and its PPI, preemergence spray of pendimethalin, d~rected spray of 2, 4-D EE as early postemergence and its split application (pre+early post) and different treatments of alachlor such as PPI, premergence use w1 th water and soil, early postemergence spray· and aplit application (pre+early post). These were compared with hand weeded and unweeded checks. Results of experiment-I revealed that PPI and preemergence spray of fluchloralin and pendimethalin were effect! ve on grasses but showed little effect on sedges. Early postemergence spray of 2,4-D EE was effective on sedges, but weed shift occurred to g~asses. The crop was sensitive to 2, 4-D EE and so, growth and pod yields were effected. Alachlor, particularly under PPI, was highly effective on both grasses and sedges and was safe ~ the crop, resulting in higher pod yields and net returns. The increase in yield was by 78.6 per cent over control. Study on the use of carriers (experiment-II) showed that soil can be effectively used fbr the preemergence application of fluchloralin. It checked the growth of grasses similar to PPI and premettgence spray and in add! tion, was effective on sedges too. Sand, urea and water as carriers caused sindlar effect as that of PPI and the weed control with all these paactices was on par ~ that under star weeding twice. Fluchloralin was not suitable for early postemergence use and carriers showed no mo~fying effect. Hand weeding improved the pod yields by 88.3 per cent over control, while preemergence fluchloralin with soil as carrier caused 76.0 per cent increase. The net returns were higher with the latter. Most of the above observations were verfied from the trial conducted during summer, 88-89. Preemergence application of fluchloralin with soil was as effective as its PPI. Directed spray of early postemergence 2, 4-D EE controlled Cyperus rotundus, , but lowered the pod yields. PPI of alachlor was the most effective chemical weed control practice, closely followed by its early postemergence spray or split application. Chemical weed control resulted in higher net returns compared to hand weeding. The results suggested the use of alachlor as PPI for effective weed control in groundnut. |
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Date |
2016-08-17T10:23:32Z
2016-08-17T10:23:32Z 1989 |
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Type |
Thesis
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Identifier |
http://krishikosh.egranth.ac.in/handle/1/72684
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Language |
en
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Relation |
D3360;
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Format |
application/pdf
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Publisher |
ACHARYA N.G. RANGA AGRICULTURAL UNIVERSITY, RAJENDRANAGAR, HYDERABAD.
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