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Accueil du site → Master → Inde → 2018 → Estimation of reference evapotranspiration (Eto) by different methods and determination of crop water requirement of major kharif

Vasantrao Naik Marathwada Krishi Vidyapeeth, Parbhani (2018)

Estimation of reference evapotranspiration (Eto) by different methods and determination of crop water requirement of major kharif

Phad, Sachin Venkatrao

Titre : Estimation of reference evapotranspiration (Eto) by different methods and determination of crop water requirement of major kharif

Auteur :

Université de soutenance : Vasantrao Naik Marathwada Krishi Vidyapeeth, Parbhani

Grade : Master of Science in Agricultural Meteorology 2018

Résumé partiel
The research work was conducted for “Estimation of Reference evapotranspiration (ETo) by different methods and determination of crop water requirement of major kharif cereals” during 2017-18. The historical daily weather data (29 to 35 years) for all districts except Hingoli were obtained from IMD, Pune. Daily mean data of all parameters were used to calculate reference evapotranspiration (ETo) by eleven methods for Parbhani district and by two methods for Aurangabad, Jalna, Parbhani, Nanded, Osmanabad, Latur and Beed districts. The daily crop water requirement (ETc) of major kharif cereals (Sorghum, Maize and Pearlmillet) was determined by multiplying daily ETo of each districts with FAO-56 Kc values. The results indicated that, for Parbhani district highest daily ETo is 13.17 mm day-1 Hargreaves-Samani method (H-S method) and lowest is 3.93 mm day-1 (Turc method). Highest weekly ETo is 13.17 mm day-1 (H-S method) and lowest is 3.27 mm day-1 (Modified Penman method). Highest monthly ETo is 401.76 mm (H-S method) and lowest is 107.07 mm (Modified Penman method). During summer season ETo was found to vary between FAO Modified Penman method (522.76 mm) to H-S method (1985.13 mm) while during kharif season it varied between Turc method (370.57 mm) to H-S method (1530.56 mm) and in rabi season it was between Modified Penman method (369.66 mm) to H-S method (1305.39 mm). Highest annual ETo is 4821.09 mm (H-S method) and lowest is 1284.86 mm (Modified Penman method).

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