The Effect of Irrigation Interval and Different Levels of Chemical Fertilizer on Yield of Alfalfa

摘要

Different environmental conditions are one of the most important issues related to the growing of plants. In the meantime, water stress is considered one of the greatest problems facing the plant productions in arid and semi-arid areas including Iran. This experimental study was conducted to evaluate the effect of irrigation interval and chemical fertilizer on yield and uptake percent of elements of alfalfa in a farm located in Khash in the year 1395. The experiment was conducted as split plots in completely randomized blocks design with three replications. The main plot was assigned to irrigation interval with four levels I1 (six days), I2 (seven days), I3 (ten days) and I4 (twelve days) and subsidiary plot was allocated to the amount of chemical fertilizer with four levels of F1 (control-zero), F2 (N100 -P70-K40), F3 (N150-P100-K70) and F4 (N200-P150-K100). The results showed that increasing the irrigation intervals decreased morphological characteristics such as wet and dry weight of root and aerial parts of plant; that this reduction can be caused by insufficient water available to the roots, stomata closure and reducing photosynthesis which ultimately reduces the functions of the mentioned traits.