8/8/2019 Effect of irrigation and weed management on grain yield, Soil moisture depletion pattern and WUE of hybrid maize

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Effect of irrigation and weed management on grain yield, Soil moisture

depletion pattern and WUE of hybrid maize under West Bengal condition.UtpalGiri1,P.Bandyopadhyay1andArunabhaChakraborty2

1DepartmentofAgronomy, 2DepartmentofAgril.Entomology,FacultyofAgriculture

BidhanChandraKrishiViswavidyalaya,Mohanpur,Nadia741252,WestBengal,India.Abstract

A field experiment was conducted in sandy loam soil of Bidhan Chandra Krishi

Viswavidyalaya,C-Block Farm, Kalyani, Nadia, West Bengal during pre-kharif season to study

the most critical physiologically water need stage of hybrid maize, effect of scheduling irrigation

at different physiological growth stages and different methods of weed control measures on yield

and WUE under West Bengal condition. The experiment was laid out in a split-plot design

having 4 levels of irrigation in main plots and 5 methods of weed control in sub-plots and

replicated thrice. The 4 different levels of irrigation were I1 irrigate at silking stage at 60 DAS,I2 irrigation at knee height stage at 35 DAS; I3 irrigation at tasselling stage at 45 DAS and I4

no irrigation. 5 different methods of weed control were W1 pre-emergence application of

metribuzin @ 600 g ha-1, W2 pre-emergence application of bispyrebac sodium 10% SC @ 800

g ha-1, W3 post-emergence application of targasuper 5 EC @ 50 ml ha-1, W4 Hand weeding

twice at 20 DAS and 40 DAS and; W5 unweeded control. The hybrid cultivar was PAC 775.

The grain yield (t ha-1) was significantly influenced by both the treatments. Highest grain

yield (5.45t ha-1) was recorded under irrigation applied at knee height stage at 35 DAS (I 2) and

pre-emergence application of metribuzin @ 600 g ha-1 (W1) and also showed the same result

when these two treatments were in combination.

The minimum number (m -2 area) and dry weight (g m -2 area) of total weeds were

recorded under irrigation applied at knee height stage at 35 DAS (I2) and hand weeding twice at

20 and 40 DAS (W4) and also showed the same result when these two treatments were in

combination. However, the highest weed control efficiency was recorded under pre-emergence

application of metribuzin @ 600 g ha-1 (W1).

The lowest CU (210.9 mm), Soil moisture depletion and highest WUE (18.8 kg ha -1 mm-

1) were recorded under irrigation applied at knee height stage (I2) and these were just reverse in

case of irrigation applied at silking stage (I1).

Key words: Hybrid maize, irrigation, weed management, yield and water use efficiency (WUE)