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http://dx.doi.org/10.7740/kjcs.2016.61.2.087

Growth and Yield Under Low Solar Radiation During the Reproductive Growth Stages of Rice Plants  

Lee, Seonghak (DONGBANGAGRO Co.(Limited))
Son, Eunho (NIAS, RDA)
Hong, Seongchang (NIAS, RDA)
Oh, SungHwan (NICS, RDA)
Lee, JiYoon (NICS, RDA)
Park, Jonghyun (Korea National College of Agriculture and Fisheries)
Woo, Sunhee (Department of Crop Science, Chungbuk National University)
Lee, Chulwon (Department of Crop Science, Chungbuk National University)
Publication Information
KOREAN JOURNAL OF CROP SCIENCE / v.61, no.2, 2016 , pp. 87-91 More about this Journal
Abstract
Recently, rice growth and production have been influenced by climatic change worldwide. In particular, under low solar radiation and cloudy weather, rice plants show abnormal physiological responses. In this experiment, plants of the rice cultivar Samgwangbyeo grown 40% and 70% shading and natural conditions at the primordium initiation stage (PI) for 30 days and the booting stage for 10 days up to heading were compared. After shading treatments, culm lengths were significnatly longer than that in natural condition plots, and panicle lengths were shorter in the 40% and 70% shading treatment plots compared to control plots. After heading, the production of dry matter treated at the PI stage was significantly lower than that at the booting stage. SPAD values of the leaf color and N concentration of leaves treated with shading were greater than those under natural conditions. In the shading treatment, the lodging index at 20 days after heading was significantly higher than that in natural condition. For yield components, number of panicles, spikelet number per panicle, and ripened grain ratio significantly decreased with shading treatment; thus, rice yield decreased significantly. For rice quality, the protein content of the head rice treated with shading was significantly higher than that in the control plot, but the amylose content of rice treated with shading was signifiantly lower than that in rice in control plots.
Keywords
lodging index; low solar radiation; rice quality; SPAD value;
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