Univrsity of Tehran Press Iranian Journal of Field Crop Science 2008-4811 53 3 2022 09 23 Yield response of low and high-yielding rice varieties to nutrition management improvement Yield response of low and high-yielding rice varieties to nutrition management improvement 107 119 89848 10.22059/ijfcs.2021.326551.654839 FA Seyed Farhad Saber Ali Department of Horticulture Science and Engineering, High Educational Complex of Torbat-e Jam, Iran. 0000-0002-1868-1313 Abdullah Darzi- Naftchali Water Engineering Department, Sari Agricultural Sciences and Natural Resources University, Iran. Shayegan Adibi Cereals and Basic Products Office, Ministry of Agriculture Jalhad, Iran. Faramak Aziz-Karimi Cereals and Basic Products Office, Ministry of Agriculture Jalhad, Iran. Journal Article 2021 07 06 Fertilizer management is one of the most important managements to improve production and also minimize its harmful effects on the environment. The aim of this study was to investigate the effect of optimal and conventional application of nitrogen (N), phosphorus (P) and potassium (K) on the yield of low (Deylamani and Hashemi) and high (Fajr and Shirodi) yielding rice varieties. The experiment was conducted as a split plot in a randomized complete block design with three replications at the research farms of Agricultural Sciences and Natural Resources of the University of Sari in 2019. In the absence of any of N, K and P fertilizers, the yield of Shiroodi cultivar was 5458, 8399 and 9926 kg ha^-1, respectively, and yield of Fajr cultivar was 4894, 7364 and 8903 kg ha^-1, respectively. In low-yielding cultivars and in the absence of any of N, K and P fertilizers, yield in Hashemi cultivar was 2969, 5134 and 4925 kg ha^-1, respectively, and yield in Deylamani cultivar was 3028, 5408 and 5384 kg ha^-1, respectively. Optimal application of N, P and K fertilizers caused a significant increase in Shiroodi, Fajr, Hashemi Tarom and local Tarom cultivars (82, 65, 55 and 34% of yield, respectively), compared to the current application of these three nutrients. The results showed that suboptimal application of nitrogen, phosphorus and potassium fertilizers is a main limiting factor in rice production, and improving the amount and split application of these fertilizers simultaneously can increase yield by 59% compared to their current application in the region. Fertilizer management is one of the most important managements to improve production and also minimize its harmful effects on the environment. The aim of this study was to investigate the effect of optimal and conventional application of nitrogen (N), phosphorus (P) and potassium (K) on the yield of low (Deylamani and Hashemi) and high (Fajr and Shirodi) yielding rice varieties. The experiment was conducted as a split plot in a randomized complete block design with three replications at the research farms of Agricultural Sciences and Natural Resources of the University of Sari in 2019. In the absence of any of N, K and P fertilizers, the yield of Shiroodi cultivar was 5458, 8399 and 9926 kg ha^-1, respectively, and yield of Fajr cultivar was 4894, 7364 and 8903 kg ha^-1, respectively. In low-yielding cultivars and in the absence of any of N, K and P fertilizers, yield in Hashemi cultivar was 2969, 5134 and 4925 kg ha^-1, respectively, and yield in Deylamani cultivar was 3028, 5408 and 5384 kg ha^-1, respectively. Optimal application of N, P and K fertilizers caused a significant increase in Shiroodi, Fajr, Hashemi Tarom and local Tarom cultivars (82, 65, 55 and 34% of yield, respectively), compared to the current application of these three nutrients. The results showed that suboptimal application of nitrogen, phosphorus and potassium fertilizers is a main limiting factor in rice production, and improving the amount and split application of these fertilizers simultaneously can increase yield by 59% compared to their current application in the region. https://ijfcs.ut.ac.ir/article_89848_6f3505772386d745318d6d2b6eca9a44.pdf