【摘要】 在青南高寒牧区播种期是影响莞根产量的最关键因素，秋季降温是决定完报停止生长的主要因素，气温日较差大是莞根获得高产的重要原因。青南高寒地区降水量基本满足莞根生长对水分的需求，莞根可以在海拔高度4500m以下较平坦、气候条件相对较好的地区种植，并可获得较高的产量，这对大力发展人工青饲料，指导畜牧业生产具有重要的现实意义。更多还原

【Abstract】 Sowing time was the key factor affecting the yield of Brassica rapa in the alpinepastoral region of southern Qinhai Province,temperature decrease in autumn was main factorlimiting the root growth,and big difference of daily temperature played an imp0rtant role inhigh yield. The precipitation of Qinhai-Xizang plateau could meet the growth of B. rapa. B.rapa could grow well and get high yield in the flat and good climatic area below altitude 4 500m, It was important to develop artificiall forage and instruct animal husbandry.更多还原