Evaluation of Salt Tolerance of 16 Introduced Varieties of Italian Ryegrass at Seedling Stage STUDIES ON THE RELATIONSHIP BETWEEN ROOT GROWTH AND YIELD IN MAIZE(ZEA MAYS) Ⅰ.RELATIONSHIPS BETWEEN THE GROWTH AND ABSORPTION ABILITY OF THE ROOTS AND THE GROWTH AND DEVELOPMENT OF THE ABOVE-GROUND PARTS OF MAIZE A Study on the Technique of Silviculture and Management of Fuelwood Study on the Above-ground Biomass Production and Nutrition Accumulation in Various Mixed Plantations of Forest Trees and Rattan Study of the Relationship Between Aboveground Biomass of the Artemisia phaerocephala Stipa bungeana Community and Climate Variables at Sandy Grassland in Erdos Plateau Varied morphological and physiological responses to drought stress among four tea Chrysanthemum cultivars DYNAMICS OF BIOMASS AND ITS COMPONENTS AND MODELS OF NUTRIENTS ABSORPTION BY SPRING MAIZE UNDER DIFFERENT NITROGEN,PHOSPHOROUS AND POTASSIUM APPLICATION RATES