Effect of sowing and fertilizer rates on rice varieties crop yield depending on sowing date

The article studied the main agrochemical indicators of the experimental field in the Lankaran-Astara Zone. The results of the analysis showed that the pH in the arable layer of the experimental field was 6.12-5.87; in the lower layers, this indicator ranged from 5.98 to 6.20. The site has low acidity. There is no carbonation in the soil, and there is generally no carbonation in areas where the pH is below 6.5. The lands of the experimental field in the Lankaran-Astara District are recognized as of high quality. The amount of humus in the topsoil is 3.03-3.14%, while in the lower layers it is 1.63-1.73% and 1.05-1.06%. The site is moderately supplied with mobile phosphorus and exchangeable potassium. The article shows the dependence of rice varieties crop yield on the timing of sowing, sowing rates and fertilizers. In each of the fertilizer rates, a decrease in crop yield was observed with an increase in the sowing rate from 1.7 million to 2.5 million per hectare. The highest crop yield was obtained when sowing in the first decade of May with a fertilizer rate of N90P60K40 and a sowing rate of 1.7 million units per hectare.