Document Type : Research Paper
Authors
Abstract
In order to investigate the economics of simultaneous effect of salinity and
drought stress on growth and yield of tomato plant (LycopersiconesculentumMill.
Cv. Oriental), four levels of irrigation (125% ET, 100%ET, 75%ET and 50%ET)
and six levels of salinity (0.1, 1.3, 3, 5, 7, and 9 dS/m) were combined in a
factorial and completely randomized design with 3 replication in a greenhouse
soilless culture. Economic model of deficit irrigation optimization was extracted
and used for growing tomato in a greenhouse under salinity and drought stresses.
The results of this model showed that the net profit of full irrigation of tomato in
soilless culture in greenhouse using water of 0.1, 1.3, and 3 dS/m was equal to the
net profit of deficit irrigation at 36%, 21%, and 24%, respectively. Thus,
considering the large number of tomato greenhouses with soilless production and
very high price of chemical fertilizers and other costs related to plant nutrition and
irrigation, applying approximately 25% deficit irrigation will cause a
corresponding reduction in total costs of production, which is economically
significant.
Keywords
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