谷子免间苗技术的土壤水分阈值研究

Study on Soil Moisture Threshold of Realization of Millet Free Thinning

目的:研究土壤水分、水势与谷子出苗率的关系,为生产应用谷子免间苗技术提供理论依据。方法:选用2种谷子品种(晋谷29号、张杂谷5号),在不同土壤水分条件下研究谷子的出苗规律及基本全苗的水分临界阈值,同时利用土壤水分特征曲线分析土壤水势对谷子出苗的影响。结果:出苗率达到80%以上的土壤水分可作为应用谷子免间苗技术的适宜播种指标,褐土性壤质土表层含水量需达到11.8%,田间持水量达到55%以上,土壤水势大于-2.15巴。结论:该研究可以为谷子免间苗技术的实施提供科学依据。

Purpose： In order to study relationships of soil moisture content and soil water potential and emergence rate of millet, and provide scientific basis for millet free thinning technology on production. Method ： It studied the regulations of millet emergence and soil moisture threshold of millet which had the full emergence of two different kind of millet varieties which were Jingu29 and Zhangzagu5 under different soil moisture content, meanwhile, it used the soil water characteristic curve to analyse the effect of soil water potential on millet emergence. Results ： The re- suits showed, when the surface moisture content of cinnamon soil of loamy soil reached 11.8%, and the field capacity reached above 55%, and soil water potential was more than-2.15bar, the millet emergence rate could reach more than 80%, and these index could be used as the optimal sowing indicators for the technology of millet free thinning. Conclusions ： So it would support scientific basis for carrying out millet free thinning technology.