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THE ROOT EXUDATION OF GRAIN AMARANTH AND ITS ROLE IN RELEASE OF MINERAL POTASSIUM Potassium release characteristics of microcrystalline potassium mineral and its effects on growth of grain amaranth Change characteristics of organic acid and amino acid in root exudates in different grain amaranth genotypes Screening grain amaeanths for genotypes of the capability of enrichment in potassium A comparison of stress effects between chloridion and sodium ion on grain amaranth seedlings under NaCl stress Study on the physiological and biochemical characters of grain amaranth genotype with rich-potassium Study on compound ecological models of orchard taking Grain amaranths as a link UPTAKE OF POTASSIUM IN SOIL AND MINERAL BY GRAIN AMARANTH (Amaranthus spp.)