Soil thermal regime, a crucial factor in plant growth and development, is influenced by the colour of plastic mulch. The effects of black plastic mulch (BPM), silver plastic mulch (SPM), transparent plastic mulch (TPM) and bare soil on the soil temperature regime as well as on the growth and yield of rainfed soybean were evaluated in a field experiment. The results revealed a strong correlation (r² = 0.85) between air and soil‐surface temperatures in the case of bare soil, but no correlation (r² = 0.03) in the case of TPM. The coloured plastic mulching raised soil temperature by 3–7 °C compared to bare soil, with a daily fluctuation of 6–17 °C at the early growth stage, while the soil temperature increased by 1–2 °C, with a daily fluctuation of 4–8 °C in later growth stages. BPM provided 1–4 °C more temperature than SPM and TPM at 5, 15 and 25 cm depths that augmented heat accumulation by 23% and 6% compared to bare soil and TPM, respectively. The coloured mulching significantly (p < 0.05) increased soybean growth attributes and thus augmented seed yield by 31–34% compared to bare soil. However, BPM, by maintaining the highest soil temperature, provided the highest seed yield of soybean. Therefore, BPM is recommended as a suitable mulch in the central Japan area. © 2020 John Wiley & Sons, Ltd.

中文翻译：

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彩色塑料覆盖物对烤后大豆土壤水热特性，生长和水分生产率的影响

土壤热状况是植物生长发育的关键因素，它受塑料覆盖物颜色的影响。在田间试验中，评估了黑塑料覆盖物（BPM），银塑料覆盖物（SPM），透明塑料覆盖物（TPM）和裸土对土壤温度状况以及雨育大豆生长和产量的影响。结果表明 ，在裸露土壤的情况下，空气与土壤表面温度之间具有很强的相关性（r ² = 0.85），而没有相关性（r ² = 0.03）（对于TPM）。与裸土相比，有色塑料覆盖覆盖使土壤温度升高了3–7°C，在生长期初期每日波动为6–17°C，而土壤温度升高1-2°C，每日波动后期生长阶段的温度为4–8°C。在5、15和25 cm的深度处，BPM比SPM和TPM提供的温度高1-4°C，与裸土和TPM相比，热量累积分别增加了23％和6％。 与裸土相比，有色地膜覆盖显着（p <0.05）增加了大豆的生长特性，因此使种子产量提高了31–34％。但是，BPM通过保持最高的土壤温度，提供了最高的大豆种子产量。因此，建议在日本中部地区将BPM用作合适的覆盖物。分级为4 +©2020 John Wiley＆Sons，Ltd.