Determination of Crop Yield Response Factor (Ky) in Deficit Irrigation Management at Different Stages of Quinoa Plant Growth

Deficit Irrigarion in water scarcity is the most important strategy to maintain crop water productivity.Therefore, cultivating drought-resistant crops such as quinoa can increase physical productivity on farm. To evaluate the yield and growth of quinoa plant in deficit irrigarion, data is needed on the yield response factor to water stress. In this study, Quinoa cultivar Titicaca was cultivated in two cropping years of 1398 and 1399. To evaluate different irrigation, 4 treatments: full irrigation, 30% allowable moisture drainage, 50% allowable moisture drainage and 70% allowable moisture drainage based on Soil moisture determinayion was applied at different periods of plant growth. Based on the results obtained, in the two crop years, the initial growth period was 20 days, the development period was 30 days, the middle period was 28 days and the final period was 12 days. The most sensitive growth period in quinoa plant was determined as the middle period with a yield response factor of 0.88. On average, with a consumption of 2563 cubic meters of water, the maximum productivity will be about 1.85 kg per cubic meter. In general, the results show that this plant has a high resistance to deficit irrigation and therefore this plant can be grown in areas with water shortage and good performance can be expected in water stress conditions.