Effects of Air Temperature, Nitrogen Concentration in Irrigation Water, and Cultivation Practices on Rice Production in the Rice Terrace Region
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概要
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Rice production in the rice terrace region was investigated, using three paddy fields located at different altitudes in different water systems in Hoshino village, Fukuoka prefecture, Japan. The effects of air temperature, nitrogen concentration in irrigation water, and cultivation practices of individual farmers were assessed, based on the growth indicators, yield components, and physicochemical properties of brown rice. It was found that abundant amounts of nitrogen-comparable to the standard nitrogen fertilization for the Yumetsukushi cultivar- were supplied from the irrigation water of field 1. Initial growth was restricted in field 2, due to early transplantation and early basal fertilization, resulting in a large percentage of ripened grains (PRG) and low protein content. The early transplantation resulted in a higher air temperature during the early ripening period and led to low amylose content. The 1000-GW was small in field 3; this was because the accumulation of starch in each grain was insufficient, due to the small production of dry matter per tiller. The underlying reasons were thought to be increased respiration and reduced efficiency of photosynthesis, both caused by excessive growth. Based on these results, the following recommendations for improving rice production in the region are indicated: an earlier transplantation date, to increase air temperature during the early ripening period and restrict initial growth; a reduction of basal nitrogen fertilization, to preclude excessive growth; and avoiding nitrogen-fertilizer applications on fields where abundant nitrogen is supplied from irrigation water.
- 2009-10-29
論文 | ランダム
- 中世史部会共同研究報告 治承・寿永の「戦争」と鎌倉幕府 (1990年度日本史研究会大会特集号--社会構造の変容と国家) -- (第1分科会〔含 討論〕)
- 河内国金剛寺の寺辺領形成とその政治的諸関係--鎌倉幕府成立期と畿内在地寺院をめぐる寺僧・武士・女院女房
- 治承・寿永の「戦争」と鎌倉幕府(中世史部会共同研究報告) (1990年度日本史研究会大会に向けて--統一テ-マ 社会構造の変容と国家)
- 奥州合戦ノート : 鎌倉幕府成立史上における頼義故実の意義
- 日根野シンポジウムと日根荘保存運動〔含 日根荘の保全と総合調査を求める声明〕 (荘園遺構と歴史的景観) -- (日根庄と歴史的景観--関西新空港と遺跡の危機)