Studies On The Effects Of Optimal Nitrogen Application And Irrigation Time On Seed Yield And Yield Components Of Leymus Chinensis

Leymus chinensis (Trin.) Tzvel, is a dominating grass species distributed in eastern end of Eurasia. It is also an important grass species for artificial grassland establishment and eco-environmental restoration in northern and northwestern China. However, it has low heading percentage, low seed setting percentage and low seed yield in natural conditions, that severely refrains the artificial utilizing for it. Water and nutrients are indispensable for plant growth and development. So, the experimental design of Water and Nitrogen application was a randomized complete block design with a conducted split plot, in order to find the optimal control of time to improve the seed yield. The results showed that the heading percentage and the number of reproductive shoot per m2 were significantly influenced by waters and nitrogen applications in the last growing season. Increased the reproductive shoots per m2, grains number and weight can improve the seed yield by waters and nitrogen applications in the last growing season and heading year, respectively. More waters and nitrogen applications has the more significantly effect on the seed number and 1000-grain weight in April, but on the number of reproductive shoot per m2 in July. From the results of this experiment, in order to improve the seed yield of Leymus chinensis, the optimal methods is waters 30 kg/m2, meanwhile, application nitrogen 5.52 g/m2 in April and July.