Please use this identifier to cite or link to this item: https://dspace.ctu.edu.vn/jspui/handle/123456789/73294
Title: Factors explaining differences in yield response to high nitrogen fertilization among rice varieties under tropical highland conditions in central Kenya
Authors: Samejima, Hiroaki
Katsura, Keisuke
Kikuta, Mayumi
Njinju, Symon Mugo
Kimani, John Munji
Yamauchi, Akira
Makihara, Daigo
Keywords: East Africa
Grain yield
Filled grain ratio
Low temperature
Lowland rice
Issue Date: 2021
Series/Report no.: Japan Agricultural Research Quarterly;Vol. 55, No. 03 .- P.209-216
Abstract: A decrease in the filled grain ratio (FGR) under high nitrogen (N) conditions inhibits the increase in rice yield in the tropical highlands of equatorial East Africa. We hypothesized that, under high N fertilization, the decrease in FGR is due to low temperatures during the reproductive growth stages, and that high grain yield can be achieved using cold tolerant varieties. Two cold-susceptible varieties (BW196 and Komboka) and a cold-tolerant variety (NERICA 1) were grown under 57, 114, and 171 kg N ha⁻¹ of N fertilization. Grain yield increased with a higher N fertilization rate only in NERICA 1. Shoot dry weight and total spikeiet number increased in all varieties under high N conditions.
URI: https://dspace.ctu.edu.vn/jspui/handle/123456789/73294
ISSN: 0021-3551
Appears in Collections:Japan Agricultural research quarterly

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