Effect of irrigation methods and nutrient stratification on yield and yield components of rice (Oryza sativa L.) Keshvari cultivars

  Water management in agriculture and rice cultivation can greatly reduce the constraints and problems caused by water scarcity. Irrigation has a significant role in rice yield and rice yield components, and any water stress reduces filling percentages Grain and eventually reduce grain yield. Regarding recent droughts, lack of water resources at the country level, inadequate water in different stages of rice growth and, finally, reduction of rice yield, it is necessary So with proper planning, apply proper irrigation management from existing sources and soluble elements Food, maximize use to maintain optimal performance. This experiment In order to evaluate the effect of different irrigation methods on yield and yield components of rice (Oryza sativa L.) an experiment was conducted at Rice Research Institute of Iran (Mazandaran - Amol) in 2017. This study was conducted as split plot In the form of a randomized complete block design with three replications on the Keshvari rice cultivar. Treatments included different methods of irrigation At three levels (flushing, wet and drying and saturation) As the main factor and spraying with food elements Each in a ratio of five in a thousand In six levels (ordinary water, nitrogen, nitrogen + potassium, nitrogen + potassium + zinc, nitrogen + potassium + zinc + boron and nitrogen + potassium + zinc + boron + molybdenum) As a sub-agent. The results of ANOVA indicated that the irrigation factor in terms on grain yield and biological yield was significant at 1% level and was not significant in other traits. Spraying factor on any of the traits was not meaningful. The interaction of irrigation and fertilizer in terms on paddy yield in 5% and in terms on biological yield was significant at 1% level and was not significant in other traits. The interactions of two irrigation and fertilizer treatments showed that the highest yield of rice with an average of 7284 kg ha-1 and the lowest with average 4690 kg ha-1, respectively, was related to watering irrigation under nitrogen + potassium spraying and irrigation drying under water spraying conditions. In general, the results of this experiment showed that the yield of sprat in saturated irrigation increased by 1.15% and in AWD irrigation, 11.85% decrease compared to traditional flooding irrigation. Water consumption in AWD irrigation and saturation were 26.4% and 9.9%, respectively, compared to waterlogging irrigation. The highest grain yield was obtained in N + K combination fertilizer application in saturated irrigation. Considering the results of this research, one of the irrigation wet and drying and saturation methods were prioritized in rice irrigation, respectively, in this study and benefit from it.