Determining the optimal depth of irrigation water in tomato plants
Subject Areas : Crop Production ResearchDavood Akbari Nodehi 1 , Nadia Nadia Dekdouk 2 , Fatemeh Naderi 3 , Abed Vahedi 4
1 - Assistant Professor and Academic Member, Department of Irrigation, Qaemshahr Branch, Islamic Azad University, Qaemshahr, Iran.
2 - Mazandaran Region 2 Secretary of Education, Health, Mazandaran, Iran.
3 - M. Sc Graduate, Department of Water Engineering, Faculty of Agricultural Engineering, Sari University of Agricultural Sciences and Natural Resources, Sari, Iran.
4 - Assistant Professor and Academic Member, Department of Agronomy, Qaemshahr Branch, Islamic Azad University, Qaemshahr, Iran.
Keywords: Optimization, Production function, Productivity of irrigation water,
Abstract :
This experiment was done in 2010 to determining the optimal depth of irrigation and observing the application of this depth compared to full irrigation can significantly save irrigation water consumption and on the other hand, due evaluate the possibility of increasing the cultivated area, it can increase the amount of net income to a great extent. In this research, the optimal amount of irrigation water for tomato plant in different conditions, maximum yield, land limitation, water and low irrigation was determined. The treatments were carried out in the form of a randomized complete block design with six irrigation levels: zero (no irrigation), 20, 40, 60, 80 and 100 percent of the plant's water requirement). Comparison of average data showed that there is a significant difference between tomato yield in different treatments. The relationships between performance and cost with water consumption were obtained by linear and quadratic polynomial functions, respectively. The amount of irrigation water for maximum production was equal to 570 mm, in the condition of land limitation it was equal to 513 mm and in the condition of water limitation it was 458 mm. In the conditions where the land is the limiting factor, applying low irrigation for tomatoes, the amount of 21% profit per unit area is equal to full irrigation. In this case, the amount of water used for tomatoes will be 454 mm. In the conditions where water is the limiting factor, with the application of low irrigation for tomatoes by 35%, the profit from the surface unit is equal to the profit from full irrigation. In this case, the amount of irrigation water for tomatoes is equal to 366 mm and the surface that can be irrigated by this water is 1.56 times the surface that will be irrigated by the maximum amount of water.
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