Mineral Fertilizers’ Influence on Rice Productivity in Saline Soils in Kyzylorda Region - Kazakhstan

The goal-directed study sought to determine the effects of mineral fertilizers on the productivity of two rice cultivars in the Kyzylorda region, Kazakhstan.In 2015, with the constant flooding of rice crops, the growing of two rice cultivars (Anait -a Russian breed, and Tugusken -a national breed of Kazakhstan) sustained mineral fertilizers with rates of N 120 Р 90 K 60 .In 2016, the field experiments continued on the norms of mineral fertilizer application.The highest density of rice herbage, tillering, and grain yield were visible on the fields with the rice cultivar Tugusken.In 2015, the low rice yield of 31.34-34.5 t/ha was evident, caused by severe soil salinization and insufficient mineral fertilizers.Therefore, in 2016, the following varied doses of mineral fertilizers gained scrutiny for rice on the degraded site: N 120 Р 90 K 60 , N 150 Р 90 K 60 , and N 180 Р 90 K 60.Based on the 2016 study results, for rice, the optimal dose of fertilizers N 150 Р 90 K 60 performed better, and the increased dose of nitrogen (180 kg) did not considerably enhance the rice grain yield (49.2-47.5 = 1.7 t/ha).With enhanced nitrogen dose, the rice growing season also lengthened, causing the appearance of empty grains in panicles.