Effects of Clomequat-Uniconazole 30% Micro-Emulsion on Stem Physical and Chemical Characteristics of Rice Effect of growth inhibitors on biomass structure, energy distribution and lodging rates for populations of Elymus sibiricus Effects of plant growth regulators on Tagetes erecta L.seedling growth Effects of Ethylene-Chlormequat-Potassium on Leaf Nitrogen Assimilation after Anthesis and Early Senescence under Different Planting Densities Effects of Ethylene-Chlormequat-Potassium on Characteristics of Leaf Senescence at Different Plant Positionsafter Anthesis under Different Planting Densities