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任何牧草品种的正常生长发育都要有相适应的生态条件。因此,掌握不同生态条件及生态型,才能确定从什么地区引入品种容易成功,一般来说,从生态条件相似地区引入品种成功的可能性大,具体说引种应遵循以下几条原则: 1、纬度相同或相近地区间引种较易获得成功。因为日照时数及月平均温度和年平均温度随纬度的高低而有差异。纬度越高,夏季白昼时间愈长,温度愈低,月平均气温和年平均
The normal growth and development of any forage species have to adapt to the ecological conditions. Therefore, to grasp different ecological conditions and ecotypes, can it be determined that it is easy to introduce varieties from different regions. In general, it is highly likely that varieties will be introduced successfully from areas with similar ecological conditions. Specifically, the introduction should follow the following principles: 1. Latitude The introduction of the same or similar interval easier to succeed. Because sunshine hours and the monthly average temperature and the average annual temperature varies with the latitude. The higher the latitude, the longer the summer daytime, the lower the temperature, the mean monthly temperature and the annual average