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＜departmental bulletin paper＞
Multivariate Analysis of Factors Controlling the Yield of Paddy Rice : Case Study of the Usa Plain, Oita Prefecture

Creator
Author PID
K001541
Creator Name
江頭, 和彦
Egashira, Kazuhiko
Affiliation
Affiliation Name
九州大学農学部土壌学教室
Laboratory of Soils, Faculty of Agriculture, Kyushu University
Language
Japanese
Publisher
九州大學農學部
Faculty of Agriculture, Kyushu University
Date
1989-11
Source Title
Science bulletin of the Faculty of Agriculture, Kyushu University
Vol
44
Issue
1/2
First Page
47
Last Page
53
Publication Type
Version of Record
Access Rights
open access
JaLC DOI
https://doi.org/10.15017/23323
Related DOI
九州大學農學部學藝雜誌 || 44(1/2) || p47-53
Science bulletin of the Faculty of Agriculture, Kyushu University || 44(1/2) || p47-53
http://www.agr.kyushu-u.ac.jp/
Related URI
九州大學農學部學藝雜誌 || 44(1/2) || p47-53
Science bulletin of the Faculty of Agriculture, Kyushu University || 44(1/2) || p47-53
http://www.agr.kyushu-u.ac.jp/
Relation
九州大學農學部學藝雜誌 || 44(1/2) || p47-53
Science bulletin of the Faculty of Agriculture, Kyushu University || 44(1/2) || p47-53
http://www.agr.kyushu-u.ac.jp/

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Details

Record ID
23323
Peer-Reviewed
Unrefereed
Subject Terms
水稲収量
土壌要因
多変量解析
宇佐平野
数量化分析Ⅰ類
ISSN
0368-6264
NCID
AN0005519X
Notes
Hayashi's theory of quantification No.1 was used to examine the controlling factors of the paddy-rice yield in the Usa plain, Oita prefecture. The rice yield of the years 1984, 1985 and 1986 was employed as a criterion variable, and the following independent variables as items: year, soil type (soil series group), rate of nitrogen fertilizer application, soil reaction of a plow layer, and cation-holding capacity of a subsurface layer. The multiple correlation coefficient was 0.78, so 61% of the total variance in the yield was explained. Year gave the highest partial correlation coefficient (r=0.70), followed by soil type (r=0.56). The item year is an indication of weather in the rice cultivation season of that year. Thus, the weather of the rice cultivation season is the most important item to control the paddy-rice yield. The items such as rate of nitrogen fertilizer application, soil reaction of a plow layer, and cation-holding capacity of a subsurface layer hardly contributed to the size of the rice yield. These items are relating to management practices, so the soil management should be practiced depending on weather and soil type.
大分県宇佐平野での3年間の水稲収量(精玄米重)を外的基準として数量化分析I類を行い,各要因が水稲収量に及ぼす寄与について評価した.要因としては年次,土壌統群,窒素施肥量と,土壌の化学性に因子分析を適用して抽出した表層土の土壌反応を表わす因子と下層土の養分保持能を表わす因子を採用した.数量化分析の決定係数は0.61であり,一応の予測精度と考えた.要因のなかでは年次の寄与が最も大きかった.年次はその年の稲作栽培期間の天候に対応するので,水稲収量には,土壌要因や肥培管理要因よりも気象要因がより強く影響すると言える.年次に次いで,土壌統群の寄与が大きかった.水稲収量に対する土壌要因という観点からみる場合,個々の土壌の性質でみるよりも土壌統群という分類単位でみるほうがより適切である.窒素施肥量,表層土の土壌反応因子,下層土の養分保持能因子の水稲収量に対する寄与は,極めて小さいかあるいはほとんどみられなかった.単年度の水稲収量を外的基準とした場合でも,その寄与は小さかった.これらの要因は栽培管理に対応すると考えられる.気象条件と土壌統群に応じて栽培管理を行うことの必要性が示唆される.
Created Date 2012.07.25
Modified Date 2022.11.11

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