عنوان مقاله [English]
نویسندگان [English]چکیده [English]
The aim of this research was to study the effects of water stress on nitrogen and growth parameters of corn in a line source sprinkler irrigation system. For this purpose, effects of four levels of 0, 90, 180, and 270 kg N/ha from urea source and four level of irrigation water (6400, 7500, 8800 and 9500 m3.ha-1, I1, I2, I3, I4, respectively) in minimum tillage system were investigated by using a split-block design. In this tillage system, a combined cultivator was used and all tillage and cultivation operations were performed in one step. The results showed that the main effects of irrigation treatments on plant height, stem diameter, fresh yield, concentration and total uptake of nitrogen were significant at (P <0.01) levels. Nitrogen application also had significant effects (P <0.01) on plant height, fresh yield, moisture content of plants at harvest time, and total uptake of nitrogen, phosphorus, and potassium. Overall, the results showed that: 1) corn production was highly dependent on the amount of water used such that, at each level of nitrogen, reducing the amount of water reduced the yield, 2) the effectiveness of nitrogen depended on the amount of irrigation water, 3) the highest dry foliage yield was obtained from application of I1N270 treatment, and 4) there was no significant difference between I1N270 and some treatments such as I3N180 treatment (application of 180 kg nitrogen and 7,500 m3 irrigation water per hectare) and I2N90, therefore, in water scarcity condition and for similar areas, this treatment is recommended.