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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.
Saeed Ghavam; Hossin Homami; Abbas Khashei
Abstract
Water is one of the most important factors that limit agricultural development, especially in arid and semiarid regions around the world. One of the important data for water management is the amount of water requirement of different plants. In this regard, by measuring water input and output in lysimeters ...
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Water is one of the most important factors that limit agricultural development, especially in arid and semiarid regions around the world. One of the important data for water management is the amount of water requirement of different plants. In this regard, by measuring water input and output in lysimeters and using water balance equation, crop water use is determined. In this study, to determine crop coefficients of Milk thistle, as a valuable medicinal herb, a 1-year lysimetric experiment was conducted in Faculty of Agriculture, Birjand University, during the growing season of 2018. To conduct this project, six weighing lysimeters were used. To determine potential evapotranspiration as a reference crop, grass was grown in three lysimeters and, in three other lysimeters, Milk thistle (Silybum marianum L.) was planted. Based on the results, the reference crop evapotranspiration and actual evapotranspiration of the plant were equal to, respectively, 1179.5 and 920.2 mm, during the growing period of 177 days. The length of different stages of plant growth, including the initial, development, middle, and end stages was 22, 35, 70, and 50 days, respectively. Finally, based on the FAO method, the crop coefficient (KC) curve was drawn and the average of crop coefficient at each of four stages of plant growth was determined as 0.34, 0.69, 0.93, and 0.77, respectively.