Research Of Native Grass Seed Coating In Qinghai-Tibet Plateau And Screening Of Anti-Shattering Matters In Vicia Sativa

The Qinghai-Tibet Plateau accounts for about 1/4 of China’s land area and serves as a barrier for China’s water resources and ecological security.Although the vegetation activity of alpine grasslands on the Tibetan Plateau tended to be better during the recent decades under the influences of climate change and human activities,but most of the grassland is still degraded to varying degrees,and some parts have deteriorated.Elymus nutans is the dominant species in alpine steppes and meadows,and Vicia sativa is widely used as a high-quality leguminous forage.The use of seed supplementary sowing technology can slow down grassland degradation to a certain extent,but there are some problems such as low seed emergence rate,easy to be eaten by animals,and easy cracking of pods of V.sativa which is not conducive to seed harvest.Aiming at the above problems,the effects of different seed coating agents on seedling emergence of the two forages and the effects of anti-shattering pod agents and different harvest time on seed yield and quality of V.sativa were studied.The main results were as follows:1.The coating scheme 6 was determined as the best seed coating agent formula.The formula contains nutrients,plant growth regulators and fungicides.The effects of different herbs on plant growth were compared,and the sensitivity of common vetch to different herbs was found to be different.2.Matters 7 of anti-shattering pod agent was the best.The results showed that there was no significant difference in the germination of the seeds under different treatments,and the pod shattering rate and pod shattering power of the fruit pods under different treatments were significantly decreased and increased,respectively.3.The seed quality of V.sativa tended to be stable after flowering for 25 days.With the increase of time after flowering,the seed germination rate increased at first and then tended to be gentle,while the seed yield and other agronomic traits increased at first and then decreased.The change mainly occurred between 25 and 30 days after flowering.