中温带黑土区紫花苜蓿不同农艺措施下生产能力研究

Study on productivity of Medicago sativa with different agronomic measures in black-soil region of mid-tempenate agriculture zone

围绕如何提高中温带黑土区紫花苜蓿Medicago sativa生产能力，开展了与此相关的品种、种植方式、施肥、播期试验研究。结果表明，该区域紫花苜蓿生产能力达到9826．3～12191kg／hm^2。如果进一步优化集成品种、种植方式、施肥、播期等先进实用技术，即在种植方式上应用有利增加保苗株数和分枝的15cm平作，在品种上应用生长快、抗寒性强的龙牧801品种，在施肥上应用有利活化土壤、促进根系生长的磷钾有机肥组合（P2O5 138kg／hm^2＋K2O 150kg／hm^2＋有机肥30t／hm^2）施肥技术，在播期上应用有利提高光水热资源利用、加快植株生成、增强抗寒能力的夏季早期（7月5日左右）播种技术，该区紫花苜蓿的生产能力将会更高。

In order to improve the productivity of Medicago sativa in black-soil region of mid-temperature agriculture zone. Experiments were conducted in terms of variety, fertilization and sowing time. Results showed that the yield of M. sativa was 9 826.3--12 191 kg/hm2 under the integration of current techniques. The productivity of M. sativa could be improved if the related techniques were optimized. One of optimized techniques was applying the 15 cm width of ridge that could increase the number of seedlings and the branches of the plants. Another way was to use fast grow and cold tolerant variety such as Longmu 801. Fertilization of P20s （138 kg/hm2 ）, K20 （150 kg/hm2 ） and manure （30 000 kg/hm2） could increase activation of soil and the roots growth. The fourth way was sowing early in summer （July 5th） to improve the productivity.