Determination of Production Function and Optimal Depth of Irrigation of roselle under Water Deficit and Potassium Fertilizer

Water restriction is one of the main inhibitors of crop production. Therefore, choosing a superior and superior strategy is essential for making water in its design. For this purpose, an experiment was conducted in a split plot in a randomized complete block design with three replications at the Semi-drainage Research Farm on roselle. Treatments included four levels of irrigation water (120, 100, 75 and 50% of plant water requirement) and three levels of potassium fertilizer (100, 75, 50 and 25% potassium). The purpose of this research is to estimate the production capacity, index calculations, and water intake. The best sour tea production function was selected from four production functions (linear, logarithmic, quadratic, and transcendental) based on the lowest error statistics. In order to investigate the separate and combined effects of potassium fertilizer and irrigation water depth from end production to depth of irrigation water (MPI), end production to potassium fertilizer (MPk), final ratio of technical alternative rate to potassium fertilizer and irrigation depth (MRTSI, k), final production value for irrigation water depth (VMPI) and final production value for potassium fertilizer (VMPk) were used. Final production index was 1.4 for water depth at minimum depth of irrigation water (MPI) and its value for maximum irrigation depth was -0.86 kg/cm depth. It was water. The final production index for minimum and maximum potassium fertilizer consumption was 3.92 kg and 3.77 kg, respectively. The results also showed that by applying irrigation under water limitation conditions, the optimum depth of water consumption compared to the maximum depth of water use at levels of 75, 121.5 and 150 kg potassium fertilizer were 13.29, 14.34 and 1.1, respectively. It has reduced water consumption by 13 cm. As can be seen, increasing the potassium fertilizer up to 75% resulted in more water savings. The use of potassium fertilizer can reduce the damage caused by drought stress in roselle.