Investigating the effect of water stress and different levels of organic and chemical fertilizers on rice yield and yield component

This research aims to investigate the effect of water stress at different levels of organic and chemical fertilizers on the agronomy characteristics of two cultivars of Guilaneh and Hashemi rice in two separate conditions in the form of flood irrigation (irrigation interval in 3 days) and in water stress (irrigation interval in 13 days) in the agricultural year of 2018 and 2019 were carried out in the east of Guilan province. For this purpose, a field experiment was carried out in the form of split plots in the form of a randomized complete block design in three replications. The treatments included the fertilizer factor as the main factor and cultivar as a secondary factor. Fertilizer factor were includes nitrogen chemical fertilizer from urea source 50, 100 and 150 kg/ha, pelleted poultry manure 1250, 2500 and 3750 kg/ha, cattle manure and municipal waste compost each at three levels 3750, 7500, 11250 kg/ha and without fertilizer. The results of the research showed that the highest yield of paddy in the first and second year in flood irrigation conditions was achieved by the interaction of fertilizer treatments in cultivars treated with , pelleted poultry manure, 3,750 kg/ha in Guilaneh with 7,399 and 7,621 kg/ha respectively. The maximum of thousand-grain weight in Guilaneh cultivar and in flood irrigation condition treatment and with pelleted poultry manure 3,750 kg/ha was 7.24 grams. The maximum index of chlorophyll meter in flood irrigation conditions and the interaction effect of fertilizer treatments in cultivars was obtained in the treatment of pelleted poultry manure 3,750 kg/ha with 6.44 in Guilaneh cultivar. Due to the fact that the Guilaneh showed the highest yield of paddy with the consumption of 3750 kg/ha of pelleted poultry manure in the conditions of stress and flood irrigation, therefore it is recommended for the study area.