Crop Coefficients of Some Selected Crops of Andhra Pradesh

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• 作者：K. Chandrasekhar Reddy ; S. Arunajyothy…
• 关键词：Reference crop evapotranspiration ; Crop coefficient ; Crop evapotranspiration ; Polynomial model
• 刊名：Journal of The Institution of Engineers (India): Series A
• 出版年：2015
• 出版时间：June 2015
• 年：2015
• 卷：96
• 期：2
• 页码：123-130
• 全文大小：646 KB
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• 作者单位：K. Chandrasekhar Reddy (1)
  S. Arunajyothy (2)
  P. Mallikarjuna (2)
  
  1. Department of Civil Engineering, Siddhartha Institute of Engineering and Technology, Andhra Pradesh, India
  2. Department of Civil Engineering, S V U College of Engineering, S V University, Tirupati, 517502, Andhra Pradesh, India
  
• 刊物主题：Civil Engineering;
• 出版者：Springer India
• ISSN：2250-2157

文摘

Precise information on crop coefficients for estimating crop evapotranspiration (ET_c) for regional scale irrigation planning is a major impediment in many regions. Crop coefficients suggested based on lysimeter data by earlier investigators have to be locally calibrated to account for the differences in the crop canopy under given climatic conditions. In the present study crop coefficients were derived based on reference crop evapotranspiration (ET₀) estimated from Penman–Monteith equation and lysimeter measured ET_c for groundnut, paddy, tobacco, sugarcane and castor crops at Tirupati, Nellore, Rajahmundry, Anakapalli and Rajendranagar centers of Andhra Pradesh respectively. Crop coefficients derived were compared with those recommended by FAO-56. The mean crop coefficients at different stages of growth were significantly different from those of FAO-56 curve though a similar trend was observed. A third order polynomial crop coefficient model has therefore been developed as a function of time (days after sowing the crop) for deriving suitable crop coefficients. The crop coefficient models suggested may be adopted to estimate crop evapotranspiration in the study area with reasonable degree of accuracy.