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saeid ghavamsaeidi noghabi; ali shahidi; Hossin Homami
Abstract
Determination of crop water requirement is of great importance in irrigation planning and effective management of water in agriculture. In this regard, lysimeters are used to measure water input and output and water balance method. Therefore, this research was carried out to determine the water requirement ...
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Determination of crop water requirement is of great importance in irrigation planning and effective management of water in agriculture. In this regard, lysimeters are used to measure water input and output and water balance method. Therefore, this research was carried out to determine the water requirement of Cannabis sativa L. in 2017 at the Faculty of Agriculture of Birjand University. For this purpose, six weighing lysimeters were used and cannabis water requirement was calculated using the water balance equation. Three lysimeters were planted to grass (12 cm height) as the reference crop, and in the other three lysimeters the cannabis plant was cultivated. Based on the results of the water balance equation, the evapotranspiration potentials of the reference plant and cannabis were 899.6 and 688.89 mm, respectively. The length of different stages of plant growth, including the initial, development, middle and end stages, was 30, 55, 75, and 20 days, respectively. Also, the cannabis crop coefficient values in the four stages of plant growth were 0.28, 0.68, 1.01 and 0.54, respectively. These values are recommended for estimating the water requirement and irrigation management of cannabis.
Elham Saberi; fateme rezaei; a kh
Abstract
Detailed estimation of evapotranspiration is required for water balance studies, water utilities, design and management of irrigation conveyance systems and water resources management, and other purposes. In this study, crop coefficients and water requirements of Ajwain, which is one of the most important ...
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Detailed estimation of evapotranspiration is required for water balance studies, water utilities, design and management of irrigation conveyance systems and water resources management, and other purposes. In this study, crop coefficients and water requirements of Ajwain, which is one of the most important medicinal herbs, were determined during a growing season in College of Agriculture, University of Birjand, by using lysimeters. For this purpose, three weighing lysimeters were used and water requirement of Ajwain was calculated by water balance method. To calculate the reference evapotranspiration, common grass sown in green spaces was used with a height of 12 cm as the reference plant. Finally, at the end of the growing season, values of Ajwain crop coefficients during different growth stages including early stage, crop development, midseason, and late season were obtained as, respectively, 0.78, 1.06, 1.13 and 0.96. Also, the total evapotranspiration of the plant in lysimeter was 492 mm.