Potの土壌温度調節に関する研究 : III Wagner potを用いた秋季における栽培例

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There have been only a few reports which demonstrate the micrometeorological relationships between plant roots and soil environment in pot cultures. The objective of this study was to elucidate the effect of albedo on the growth of radishes planted in Wagner pots. For this purpose, four pots of different conditions were prepared, i. e., the outer surface of the pot was coated with a black lacquer, covered with aluminum film, covered with soil by buryng the pot in the ground and remained uncovered. On September 12, 1975, radish seeds (cultivar Shiju-nichi) were sown at the center of pots and four portions (east, west, south and north) from the center and equally distant each other. At each portion one seedling of uniform size was left and used as plant materials afterward. Observations terminated on October 22. The ratio of solar radiation onto the outer surface of pots changed at every directions during the observation period, resulting in the change of soil temperature environment in the pots. Similar trend was observed for soil in the non-planted pot, indicating that, in this case, the radish growth may slightly affect the temperature environment. The growth of radish roots was most superior at the north portion of the black lacquered pot, among all portions and all pots examined, as measured by fresh weight on October 22. It was proposed that for the growth of plants in pots two factors should be considered, one is the conditions of outer surface of pots and the other is the location of plants to be grown in pots.Pot栽培における地下環境と, 生育との関連性に冠する微気象的な研究は, ほとんどなされていない. 本報ではPot壁面のAlbedoを高低に調節した2区, Potを埋設処理した1区, Pot壁面無処理の計4区を設け, 各々Pot内の中央部と東西南北の計5地点に四十日大根を栽培し, 土壌温度の影響をみた. 実験は1975年9月12日より10月22日まで行なった. 生育期間中, Pot壁面の各方位における日射量の平地に対する比率は, 月日の経過につれて各方位ごとに, その差が大きくなった. したがって, Pot内土壌温度の分布様相もそれの影響をうけ, Pot栽培大根の地下部の環境は, 増々複雑化した. 大根繁茂の土壌温度に及ぼす影響は, 晴天日でも大きくはなかった. 全地点を通じて, 黒塗Pot北地点の地下部重が最大となった. 以上の点から, Potの壁面処理をした場合, Pot内作物の生育地点が問題になることが示唆された.
香川大学の論文
1978-09-30

Potの土壌温度調節に関する研究 : III Wagner potを用いた秋季における栽培例

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