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International Journal of Current Microbiology and Applied Sciences (IJCMAS)
IJCMAS is now DOI (CrossRef) registered Research Journal. The DOIs are assigned to all published IJCMAS Articles.
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National Academy of Agricultural Sciences (NAAS)
NAAS Score: *5.38 (2019)
[Effective from January 1, 2019]
For more details click here

ICV 2018: 95.39
Index Copernicus ICI Journals Master List 2017 - IJCMAS--ICV 2018: 95.39
For more details click here

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PRINT ISSN : 2319-7692
Online ISSN : 2319-7706
Issues : 12 per year
Publisher : Excellent Publishers
Email : editorijcmas@gmail.com / submit@ijcmas.com
Editor-in-chief: Dr.M.Prakash
Index Copernicus ICV 2018: 95.39
NAAS RATING 2020: 5.38

Int.J.Curr.Microbiol.App.Sci.2017.6(10): 3458-3471
DOI: https://doi.org/10.20546/ijcmas.2017.610.408


Wheat Productivity and Marginal Analysis of Evapotranspiration Production Functions under Deficit Irrigation across Sowing Dates in Eastern India
Swaraj Kumar Dutta1*, Pramiti Kumar Chakraborty2, Swapan Kumar Mukhopadhyay3, Rajib Nath3 and Prodip Kumar Chakraborty2
1Department of Agronomy, Bihar Agricultural University, Sabour, Bihar, India
2Department of Agril. Meteorology and Physics, Faculty of Agriculture, Bidhan Chandra Krishi Viswavidyalaya, Mohanpur, West Bengal, India
3Department of Agronomy, Bidhan Chandra Krishi Viswavidyalaya, Mohanpur, India
*Corresponding author
Abstract:

Wheat (Triticum aestivum L.) is a highly irrigation-responsive crop and produces contrasting results under limited irrigation situations, and therefore demands judicious use of irrigation water to produce ‘more crops per drop’ (i.e more grain per mm of water). A three year field experiment was conducted to study the effects of water deficit on yield of wheat crop and their productivity functions. Three wheat varieties sown on 25th November and 20th December were tested under three different irrigation levels at various growth stages. The seasonal evapotranspiration (ET) was maximal under 25th November with five irrigations while the highest water use efficiency (WUE) was obtained under one irrigation applied at crown root initiation (CRI). With timely sown conditions, wheat WUE values varied from 14.5–14.8 kg ha-1 mm-1 for one irrigation at CRI to 11.3–11.6 kg ha-1 mm-1 under five irrigations. Under delayed sowing the values ranged from 13.0–13.1 kg ha-1 mm-1 with one irrigation to 10.7–10.9 kg ha-1 mm-1 for five irrigations. Values of the yield response factor (Ky) greater than one illustrated the sensitivity of the crop to water stress. Treatments receiving five irrigations were most sensitive (Ky = 3.52) while those receiving three irrigations were least sensitive (Ky = 1.75). The highest yield was obtained when the elasticity of water productivity (EWP) = 0, regardless of date of sowing. The lowest values of EWP were obtained under one irrigation under timely sown condition. Higher values of EWP under delayed sowing indicate that there is a scope to increase yield and WUE of the crop through better irrigation management.


Keywords: Evapotranspiration, Water use efficiency, Marginal water use efficiency, Elasticity of water productivity.
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How to cite this article:

Swaraj Kumar Dutta, Pramiti Kumar Chakraborty, Swapan Kumar Mukhopadhyay, Rajib Nath and Prodip Kumar Chakraborty. 2017. Wheat Productivity and Marginal Analysis of Evapotranspiration Production Functions under Deficit Irrigation across Sowing Dates in Eastern India.Int.J.Curr.Microbiol.App.Sci. 6(10): 3458-3471. doi: https://doi.org/10.20546/ijcmas.2017.610.408