Leaf Development Responses of Trifolium repens to Climatic and Non-climatic Factors Effect of Cutting Frequency on Overground Biomass and Root System of Ceratoides lanata (Pursh) Howell Effects of Cutting Frequency on the Experimental Population of Common Wild Rice Oryza rufipogon Cutting Frequency Affects Growth, Development Character and Storage Substance Accumulations in Root of Allium mongolicum Regel Evaluation of Nutritive Value of New Lines of Dactylis glomerata L. Effect of Planting Density and Cutting Frequency on Biomass Yield and Quality of Pennisetum americanum×P.purpureum