Stage Specific Actual Crop Evapotranspiration of Bt. Cotton under Different Mulch Conditions
G.V. Prajapati*
Junagadh Agricultural University, Junagadh, Gujrat, INDIA
R. Subbaiah
College of Agricultural Engineering and Technology, AAU, Godhra, Gujrat, INDIA
A.N. Kunapra
College of Agricultural Engineering and Technology, AAU, Godhra, Gujrat, INDIA
N.S. Vithlani
Junagadh Agricultural University, Junagadh, Gujrat, INDIA
A.M. Paghdal
Junagadh Agricultural University, Junagadh, Gujrat, INDIA
H.Y. Maheta
Junagadh Agricultural University, Junagadh, Gujrat, INDIA
H.H. Mashru
Junagadh Agricultural University, Junagadh, Gujrat, INDIA
H.R. Vadar
Junagadh Agricultural University, Junagadh, Gujrat, INDIA
R.J. Patel
Junagadh Agricultural University, Junagadh, Gujrat, INDIA
J.M. Modhvadia
Junagadh Agricultural University, Junagadh, Gujrat, INDIA
DOI: NIL
Keywords: Actual crop evapotranspiration, Biodegradable plastic mulch, Silver black plastic mulch, Wheat straw mulch
Abstract
Acquaintance of the exact water loss through actual evapotranspiration is necessary for sustainable development and environmentally sound water management to avoid the underestimation or overestimation of crop water consumption. An accurate estimation of crop evapotranspiration is important for better irrigation scheduling and water management. An attempt has been made to estimate actual evapotranspiration (ETa) at different growth stage of Bt. cotton under silver black plastic mulch, biodegradable plastic mulch, wheat straw mulch and no mulch condition using soil moisture sensor and it was compared with crop evapotranspiration (ETc) estimated using Penman- Monteith and Pan Evaporation method. Results revealed that Pan evaporation and Penmen Monteith approach over estimated cumulative ETc under by 46.11%, 45.84%, 39.33%, 56.10% and 22.89%, 22.50%, 13.19%, 39.42% than sensor based ETc under silver black plastic mulch, biodegradable plastic mulch, wheat straw mulch and control respectively at initial stage of Bt. cotton which was followed by development stage, mid stage and end stage of Bt. cotton. Sensor based approach estimated lower cumulative ETc at all growth stage than Penmen Monteith method and Pan ETc approach.
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