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Solāpur, India

The study was carried out to estimate reference crop evapotranspiration, develop crop coefficient, area factor and estimate evapotranspiration of pomegranate for Nasik district of Maharashtra. The crop coefficient values were estimated on weekly basis from the concept of shaded area approach. Shaded areas were estimated at mid-day with the help of plywood board having 20 × 20 cm grid. Pomegranate evapotranspiration was determined on monthly basis using crop coefficient and reference crop evapotranspiration. The water to be applied through drip system at 90% efficiency to pomegranate plantation spaced at 3 × 4.5 m ranged from 1.4-4.3, 3.1-10.7, 2.6-30.4, 3.9-40.7 and 4.4-50.1 L day-1 tree-1 for 1st to 5th years. The values of reference crop evapotranspiration, crop coefficient, area factor, water requirement and water to be applied would be useful for the irrigation water management of pomegranate.

Meshram D.T.,NRC on Pomegranate | Gorantiwar S.D.,Mahatma Phule Agricultural University | Singh N.V.,NRC on Pomegranate
Mausam | Year: 2013

The study was conducted to know the best method for estimation of reference crop evapotranspiration (ETr) for Nasik station (Latitude 20° 53′ N, Longitude 75° 16′ E and altitude 565.0 m amsl), Maharashtra, India. Reference crop evapotranspiration is a basic parameter in irrigation system design. Six reference crop evapotranspiration methods were used for their daily performances under semi-arid climatic condition. The Penman-Monteith method standardized by FAO was used to compare with the Modified Penman, Hargreaves-Samani, Pan Evaporation, Blanney-Criddle and Radiation methods. Performances of these methods were made on the basis of the least root mean square error (RMSE) and regression analysis (RA). The value of RMSE ranges from 2.01 to 1.09 with the highest in Pan Evaporation method followed by Blanney-Criddle, Radiation method, modified Penman and Hargreaves-Samani method. Out of six methods Hargreaves-Samani was found to have least root mean square error (RMSE = 1.09 mm/day) and highest correlation coefficient (r=0.99) under semi-arid climatic conditions of Nasik station of Maharashtra.

Meshram D.T.,NRC on Pomegranate | Gorantiwar S.D.,NRC on Pomegranate
Mausam | Year: 2015

Pan coefficient (Kpan) is the important factor for computation of reference crop evapotranspiration (ETr) from pan evaporation (Epan). In this paper, the five approaches proposed by Cuenca, Allen and Pruitt, Snyder, Pereira and Orang were evaluated by using weather parameters for a Solapur station over the years 1983 to 2012. It was observed that, the measured value shows the bi-model variation during the year with values ranging from 0.46 to 0.87. Out of the five methods, Synder method was found to be the best for estimating Kpan with RMSE of 0.38 and MAD of 0.34. By comparing with the Penman-Monteith method, the Snyder approach was best suited. © 2015, India Meteorological Department. All rights reserved.

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