Abstract: (165 Views)
In the conditions of lack of moisture in the soil, which affects the absorption of nutrients and especially nitrogen, it is necessary to establish a balance between the nitrogen consumption and the availability of moisture in the soil. Therefore, determining the optimal level of fertilizer to achieve high performance is one of the important goals of the research. Considering that green squash is cultivated in the region and no research has been done on the effect of agricultural inputs on the characteristics of this plant. Therefore, in this research, the effect of drought stress and nitrogen fertilizer on the yield and productivity of green squash was done year 2015 in Sari city. The experiment was in the form of split plots with randomized complete design, in three replications The evaluated treatments included four irrigation levels of 25, 50, 75 and 100% of the required water as the main treatment and three levels of zero, 100 and 200 kg/ha of nitrogen fertilizer from urea source as secondary treatment. The measured factors included length, width and weight of single fruit, total plant weight, number of leaves, fresh weight, dry weight and leaf area, total yield and water consumption efficiency. The results showed that the highest yield of the product, fresh and dry weight, width and number of leaves, total weight of the plant was related to the treatment with 100% water requirement and 200 kg/ha of nitrogen fertilizer. The highest single fruit weight and fruit width are related to the treatment of 75% of water requirement and 200 kg/ha of nitrogen fertilizer. The highest water productivity was related to the treatment with 25% water requirement and nitrogen consumption of 200 kg/ha. Considering that with a 25% reduction in water consumption, a 12% reduction in yield and a more than 30% increase in water productivity, the treatment of 75% of water requirement and 200 kg of nitrogen fertilizer per hectare can be introduced as the best treatment in water-limited conditions.
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