北京地区引种国外紫花苜蓿品种生态适应性的研究

Study on ecological adaptability of alfalfa introduced from foreign countries in BeUing area

摘要: 连续3年引种国外紫花苜蓿品种试验研究结果表明，适合华北平原北部地区种植的苜蓿品种为2～5级秋眠级品种，但秋眠级FD5(Key)品种需采取相应措施提高其越冬率，而FD6(Lobo)和FD7(Durango)品种越冬率低下故不适合该区种植推广。“Haygarzer”(FD3)、“Vector”(FD4)和“Key”(FD5)品种产量高且1年可收获4～5茬，这些品种可在北京和气候类似北京的地区种植。紫花苜蓿可在北京地区安全越夏，但夏季要注意防治病虫害。紫花苜蓿播种当年的产量与积温呈线性关系，且在以后年份呈现对数关系。

Abstract: The results from three year’S continuous experimental study on the alfalfas of introductory varieties show that the alfalfa varieties with fall-dormancy grades 2～5 are suitable to be cultivated in north of North-China Plain，meanwhile some counterm easures must he taken to enhance the survival rate in winter；the varieties with falbdormancy grades 6 and 7 can not be spread out；the three varieties Haygarzer，Vector and Key can be harvested from 4 to 5 crops annually，and are suitable to be cultivated in Bering area；the alfalfas survive safely in summer in Beijing area，but some prevention measures must be taken to resist plant diseases and insect pest；the relation between the output and accumulative temperature of alfalfa is linear in that sowing year，and logarithmic in the following years．