阿鲁科尔沁旗紫花苜蓿刈割期降水适宜性分析

Analysis on Precipitation Suitability of Medicago sativa L. During Cutting Periodin Ar Horqin Banner

以内蒙古自治区阿鲁科尔沁旗2013年种植的紫花苜蓿为对象,分析2015—2018年紫花苜蓿适宜刈割期与实际刈割期差异及近30年(1989—2018年)逐日降水保证率曲线。结果表明:适宜刈割期与实际刈割期之间存在较大的差异,其中第二茬推迟最为明显;第二茬紫花苜蓿刈割期降水风险最高,第一茬、第三茬次之,第四茬风险最低;第一茬紫花苜蓿应在6月上半月完成刈割,第二茬紫花苜蓿应根据气象预报选择合适时机刈割,第三、四茬紫花苜蓿刈割期选择范围较宽。

Taking Medicago sativa L.planted in Ar Horqin Banner of Inner Mongolia Autonomous Region in 2013 as the object,the difference between the suitable cutting period and the actual cutting period of Medicago sativa L.from 2015 to 2018 and the daily precipitation guarantee rate curve in recent 30 years(1989-2018)were analyzed.The results showed that there was great differ-ence between the suitable cutting period and the actual cutting period,and the delay of the second crop was the most obvious.The precipitation risk of the second crop cutting period was the highest,followed by the first crop and the third crop,and the fourth crop was the lowest.The cutting of the first crop of Medicago sativa L.should be completed in the first half of June,the second crop should be cut at an appropriate time according to the weather forecast,and there was a wide range of cutting dates for the third crop and the fourth crop Medicago sativa L.