Crop coefficients of Bt. cotton under variable moisture regimes and mulching

Authors

  • G. V. PRAJAPATI Centre of Excellence on Soil & Water Management, Junagadh Agricultural University, Junagadh-362 001
  • R. SUBBAIAH College of Agricultural Engineering and Technology, Anand Agricultural University, Godhra-389001, Gujarat

DOI:

https://doi.org/10.54386/jam.v21i2.227

Keywords:

Silver black plastic mulch, Biodegradable mulch, Crop coefficient, Drip irrigation, irrigation regimes

Abstract

An experiment was undertaken for two years (2013-14 and 2014-15) on sandy loam soils of Junagadh (21°30’ N, 70°27’ E) to determine crop coefficients of Bt. cotton under three mulch treatments (M1- silver black plastic mulch, M2- biodegradable plastic mulch, M3- wheat straw mulch and C - control) with two irrigation regimes (I1- 1.0 IW/ETc, I2-0.8 IW/ETc). Actual evapotranspiration was estimated using soil moisture sensors. Results revealed that adjusted FAO Kc predicts higher value than sensor based Kc values at both irrigation regimes. Silver black plastic mulch recorded lower crop coefficient values at all growth stage of Bt. cotton compared to biodegradable plastic mulch, wheat straw mulch and control. Sensor based Kc ini and Kc-devvalues of silver black plastic mulch observed 72.2, 29.0 and 66.9 and 14.8 per cent lower than control at 1.0 IW/ETc and 0.8 IW/ETc respectively. Overestimated adjusted FAO Kc values caused a loss of 78.1mm and 66.5mm of precious water at 1.0 IW/ETc and 0.8 IW/ETc respectively. This study admonishes blind adoption of published FAO Kc curves for mulch conditions. 

Downloads

Published

01-06-2019

How to Cite

G. V. PRAJAPATI, & R. SUBBAIAH. (2019). Crop coefficients of Bt. cotton under variable moisture regimes and mulching. Journal of Agrometeorology, 21(2), 166–170. https://doi.org/10.54386/jam.v21i2.227

Issue

Vol. 21 No. 2 (2019): June

Section

Research Paper

License

Creative Commons License

This work is licensed under a Creative Commons Attribution 4.0 International License.

This is a human-readable summary of (and not a substitute for) the license. Disclaimer.

You are free to:

Share — copy and redistribute the material in any medium or format

Adapt — remix, transform, and build upon the material

The licensor cannot revoke these freedoms as long as you follow the license terms.

    Under the following terms:

    Attribution — You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.

    NonCommercial — You may not use the material for commercial purposes.

    ShareAlike — If you remix, transform, or build upon the material, you must distribute your contributions under the same license as the original.

    No additional restrictions — You may not apply legal terms or technological measures that legally restrict others from doing anything the license permits.

    Notices:

    You do not have to comply with the license for elements of the material in the public domain or where your use is permitted by an applicable exception or limitation.

    No warranties are given. The license may not give you all of the permissions necessary for your intended use. For example, other rights such as publicity, privacy, or moral rights may limit how you use the material.