Response of yield and yield components of released rice cultivars from ۱۹۹۰-۲۰۱۰ to nitrogen rates
Publish Year: 1400
نوع سند: مقاله ژورنالی
زبان: English
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شناسه ملی سند علمی:
JR_CAJPSI-1-1_003
تاریخ نمایه سازی: 5 خرداد 1400
Abstract:
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 ۲۰۱۱ in Iran. N rates including ۰, ۶۹, and ۱۳۸ kg N/ha as (N۰), (N۶۹) and (N۱۳۸) and rice cultivars including Nemat (C۱), Khazar (C۲), Neda (C۳), Shirodi (C۴), and Tarom (C۵). 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 ۵۵۵۲ for ۶۹ kg N/ha and ۶۱۲۴ for ۱۳۴ 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 ۶۷ to ۱۳۸ 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.
Authors
Hasan Haghshenas
Department of Agronomy and Young Research Club, Qaemshahr Branch, Islamic Azad University, Qaemshahr, Iran.
Abbas Ghanbari Malidarreh
Department of Agronomy, Jouybar Branch, Islamic Azad University, Jouybar, Iran.
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