Preliminary Study On Introduction And Cultivation Of Medicago Sativa Varieties In Zhanjiang

The introduction test was carried out on five varieties of alfalfa from Yunnan Province of beef cattle and forage research center to increase the fine grass species in Zhanjiang. We measured and compared rmination ratio and seedling growth, yield, nutrient composition, growth rate, yield, hay/green grass ratio and stem/leaf ratio, and winter overing rate and summer surviver rate, dynamic changes of proline content, proline content in different parts, such as chlorophyll content. Meanwhile, instantaneous net photosynthetic rate (Pn), transpiration rate (Tr), stomatal conductance (Gs), intercellular CO2 concentration (Ci), instantaneous water use efficiency (WUE) and some photosynthetic eco-physiological indicators of successful introduction of the three varieties of summer and the local Stylosanthes pasture Tongke excellent (cv.Reyan 2) tin were compared.The results showed that:1. The germination time of Sanditi and Futel is earlier than three other varieties. The growth of Futel on seedling stage is best. Sanditi and Algonquin are better than Central South Gap, and Wick Tin is the worst.2. The hay production order of five varieties before summer suriviver is Futel> Sanditi > Algonquin > Wick Tin)> Central South Gap; After summer suriviver, Futel> Sanditi > Algonquin.3. There is some difference on nutrient composition of five varieties. After comprehensiving analysis, we found than the quality and nutrient of Futel and Sanditi is better than others.4. The growth rate of five varieties changed greatly at different times. Before summer suriviver, an average growth rate of Futel can reach 1.48 cm/d, followed by Sanditi 1.24 cm /d; No matter before or after summer suriviver, the growth rate of Futel were significantly higher than other varieties.5. The results of green and dry grass ratio and stem/leaf ratio showed that the dry grass ratio of Futel is the largest for 25.64% , followed by Algonquin for 23.28%. The green and dry grass ratio of South Central Gorge is smallest for18.88%.The stem/leaf ratio was between 56.24%～67.38%. Futel is the largest, followed by Algonquin and South Central Gorge is smallest. Note Algonquin and Futel leaves have a high capacity and a higher harvest to promote the value, at the same time these two varieties have good quality.6. The results of winter overing rate and summer surviver rate show that the five alfalfa varieties of introduction are able to overwinter in Zhanjiang, winter rates are more than 95%, Sanditi and Futel were 100%; Central South Gap and Wick Tin can not over-summering in Zhanjiang, which is dead in the summer. Futel, Sanditi and Algonquin are able to over-summering, summer surviver rate are Futel 67.50, Sanditi 72.60%, Algonquin 56.00%. Futel and Sanditi were better adapt ability to hot conditions in Zhanjiang.7. The changes in proline content measured on the whole time, the changed of free proline of all varieties were the single-peak curve. The free proline accumulation and heat-resistant of alfalfa are existences relevance.8. The results of chlorophyll content measurement of different varieties showed that they are changes significantly in the leaf chlorophyll content at different times, Central-South Gap Wick Tin two varieties can not tolerate high temperatures, which was died in June, their changes of chlorophyll content than the other three varieties larger before the dead , After summer suriviver of the three species Sanditi, Futel and Algonquin, the chlorophyll content changes determination in the whole process, similar to "V" shape change.On comparisons between species in the five varieties tested in the ability to withstand adversity Futel the strongest, and its chlorophyll content remained the highest level, and changes is 0.7273 mg/g, Algonquin's largest on the changes to 1.8769 mg/g. Central South Gap and Wick Tin were worst,but they resistance are not bad on the time of early growth, they were died in June 2008,the maily reason is not tolerate high temperature.9. After the three varieties of successful summer suriviver and the local fine Tongke Stylosanthes pasture (cv.Reyan 2) in the determination of some comparative aspects of photosynthetic physiology and found: the three varieties of Introduction of Futel photosynthetic physiology was most, followed by Sanditi ,the result of that Futel and Futel is strong on the local environment in zhanjiang.