TY - JOUR ID - 128594 TI - Response of yield and yield components of released rice cultivars from 1990-2010 to nitrogen rates JO - Central Asian Journal of Plant Science Innovation JA - CAJPSI LA - en SN - AU - Haghshenas, Hasan AU - Ghanbari Malidarreh, Abbas AD - Department of Agronomy and Young Research Club, Qaemshahr Branch, Islamic Azad University, Qaemshahr, Iran. AD - Department of Agronomy, Jouybar Branch, Islamic Azad University, Jouybar, Iran. Y1 - 2021 PY - 2021 VL - 1 IS - 1 SP - 23 EP - 31 KW - rice KW - nitrogen KW - Cultivar KW - Tiller KW - Panicle DO - 10.22034/CAJPSI.2021.01.03 N2 - This study examined to compare high-yielding cultivars and respond to N fertilization especially yield component and the aim of this development of rice cultivars suitable for low input requirements. An experiment was arranged in a randomized complete block design with a split-plot arrangement of five rice cultivars, three N rates with four replications in 2011 in Iran. N rates including 0, 69, and 138 kg N/ha as (N0), (N69) and (N138) and rice cultivars including Nemat (C1), Khazar (C2), Neda (C3), Shirodi (C4), and Tarom (C5). The results indicated that all traits response to cultivar and N rates were detected for the parameters examined. The lowest applied N rate had a lower yield than the other two N rates. Grain yields were 5552 for 69 kg N/ha and 6124 for 134 kg N/ha averaged over all cultivars. The grain yield of Khazar and Tarom was independent of the N rate, but the grain yield of Nemat, Neda and Shirodi increased when the N rate was increased from 67 to 138 kg/ha. Panicle density responded to an N rate similar to grain yield. Khazar produced more total spikelet number while Neda had a higher Panicle density. Grain yield and yield components of Nemat, Neda, and Shirodi respond to N rates dependently when planted into high nitrogen. Finally, modern rice cultivars were more efficient at recovering N than older cultivars. UR - http://www.cajpsi.com/article_128594.html L1 - http://www.cajpsi.com/article_128594_4727c1ffa8c80ac0be0cb482d9b8b32a.pdf ER -