STUDIES ON THIN-LAYER CHROMATOGRAPHY OF FLAVONIDES FOR DIFFERENT POPULATIONS IN ALLIUM HOOKERI AND ITS RELATIVE SPECIES Sustainable Utilization and Economic Development of Some Plant Resources in Northern Pakistan Simulation of energy balance of SVAT system in the farming-pastoral zone of the Loess Plateau Evaluation of SHAW model in simulating energy balance,leaf temperature and micrometeorological variables within a maize canopy Changes of Glutamine Synthetase and Other Ammonia-Assimilating Enzymes during the Germination of the Seed and the Development of the Cotyledon in Cushaw