Effects of planting hole and soybean canopy on soil temperature beneath film mulch

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  • フィルムマルチ下地温に及ぼす植穴とダイズ植被の影響
  • フィルム マルチ シタジオン ニ オヨボス ウエアナ ト ダイズ ショクヒ ノ エイキョウ

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Abstract

This experiment examined how the planting hole diameter of films used in film mulch cultivation affects the soil temperature, in relationship to soybean. The experiment was conducted from March to June 2007. In zones without vegetation, the albedo and surface temperature of film mulch changed in proportion to the planting hole diameter. In zones with vegetation, no obvious correlation was observed. In vegetation‐free zones, the daily maximum and minimum soil temperatures were lower when the planting holes were larger. In vegetation zones, no distinct relationship was found. In all zones, the daily range ratio of soil temperature related to the planting hole diameter and the daily range ratio were also affected by the ground coverage rate. Both with and without vegetation, the daily range ratio of soil temperature was smallest in zones with 16 cm diameter planting holes.

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