physicochemical

INTEGRATED APPROACH FOR WEED CONTROL IN RABI GROUNDNUT
obtained with the treatment hand weeding twice (T 2
).
The other treatments that recorded more or less
similar yields include intercultivation fb handweeding
(T 4
), pendimethalin fb imazethapyr (T 8
), pendimethalin
fb handweeding (T 10
) and imazethapyr fb
handweeding (T 11
). It is evident from these results,
while the effect of pre-emergence pendimethalin is
as good as that of initial handweeding, with the effect
of early post emergence use of imazethapyr is similar
to that of second handweeding. Lower pod and haulm
yields were recorded with unweeded control, due to
heavy weed infestation which had adverse effect on
crop growth and development. Similar results were
obtained by Sailaja et al. (2002) and Walia et al.
(2007).
Highest N, P and K uptake by weeds was
observed when no weeding (T 1
) was practiced in
the crop (Table 2). The lowest nutrient (N, P and K)
uptake by weeds and highest uptake of N, P and K
(84.1, 19.7 and 43.6 kg ha -1 , respectively) by crop
was observed when hand weeding was practiced
at 20 and 40 DAS (T 2
). The nutrient status of soil (N,
P and K) after crop harvest was comparatively lower
in the treatments where removal by crop was higher.
The benefit-cost ratio was higher with application of
pendimethalin fb imazethapyr as well as pendimethalin
fb handweeding treatments (Table 2). This was due
to low cost of the chemicals as compared to other
practices. The study indicated the need for integrated
approaches such as combination of pre and post
emergence herbicides or herbicides followed by
physical weed control practices to check the weed
growth during crop growth period and to reduce weed
competition for nutrients and to realize higher yields
and economic returns.
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Agostinho, F. H., Gravena, R., Alves, P. L. C. A.,
Salgado, T. P and Mattos, E. D. 2006. The
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35.
Bhatt, R. K., Patel, B. J., Bhatt, V. K and Patel, P. P.
2008. Weed management through soil
solarization in Kharif groundnut (Arachis
hypogaea). Crop Researh 36(1,2 & 3): 115-
119.
Chandrika, V. 2004 Integrated Weed Management
in Groundnut (Arachis hypogaea L.) during
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248.
Rao, V. S. 2000. Principles of weed science, Second
edition, Oxford and IBH Publish Co. Pvt. Ltd.,
New Delhi.
Sailaja, K., Bucha Reddy, B and Devender Reddy,
M. 2002. Effect of seedbed preparation and
Weed control practices on growth and yield
of groundnut after Kharif Rice. Indian Journal
of Dryland Agricultural Research and
Development 17(2): 152-157.
Sasikala, B., Reddi Ramu, Y and Raghava Reddy,
C. 2002. Studies on the effect of pre and post
emergence herbicides on weed control,
growth and yield of groundnut. M.Sc. (Ag)
Thesis, Acharya N.G Ranga Agricultural
University, Hyderabad.
Walia, U. S., Surjit Singh and Buta Singh 2007.
Integrated Approach for the control of hardy
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Indian Journal of Weed Science 39(1 & 2):
112-115.
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