Wheat Yield Affected by Soil Temperature and Water under Mulching in Dryland

作者：Gang He, Zhaohui Wang, Xiaolong Ma, Hongxia He, Hanbing Cao, Sen Wang, Jian Dai, Laichao Luo, Ming Huang, S. S. Malhi · 发表于：Agronomy Journal · 年份：2017 · DOI：10.2134/agronj2017.04.0208 · 被引用次数：41 · 研究领域：Irrigation Practices and Water Management、Plant Water Relations and Carbon Dynamics、Soil and Unsaturated Flow

Core Ideas Plastic mulch increased soil temperature and water, thus increased wheat yield. High soil temperature by plastic mulch and planting legume reduced wheat yield. Incorporation of legume increased soil temperature of next wheat growing season. Planting legume increased soil water use in summer and decreased evapotranspiration in wheat season. In the Loess Plateau of northwestern China, soil water shortage is the main factor constraining dryland wheat ( Triticum aestivum L.) production. Soil mulching is considered an effective practice to improve wheat yield due to increased soil water storage, but the information related to integrated understanding of soil temperature and water is scarce. We conducted a location‐fixed field experiment with two soil mulching (plastic mulch and planting legume) treatments to confirm the effects of soil temperature and water on wheat yield under different precipitation levels. In 2014–2015 with higher than average precipitation, plastic mulch increased soil water storage by 13% at sowing and average soil temperature by 0.4°C, which in turn increased yield by 13%, compared to the control. In 2012–2013 with extremely lower than average precipitation, the high daily maximum soil temperature during wheat reproductive period decreased grain number per spike and grain weight by 16 and 4%, respectively, thus reduced yield by 16%. For planting legume, the lower soil water storage at sowing and high daily maximum soil temperature during the wheat...