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Effects of nitrogen fertilization rate and planting density on cotton biomass and nitrogen accumulation in extremely early mature cotton region of Northeast China. Study on the integrated early mature and frost。avoiding cultivation techniques of cotton in Shanxi Province THE CHARACTERISTICS OF HIGH\|YIELD GENOTYPE OF EARLY\|MATURE MUTANT LINES IN BARLEY EARLY MATURING MUTANITS IN INDICA RICE AND THEIR TRAITS Early Autumn Cabbage Hybrid ‘Huifeng 4’ Early Autumn Cabbage Hybrid ‘Huifeng 4’