To investigate the effects of fertilization,cropping density and weed-control on the biomass and grain yield of winter wheat,an experiment was conducted in semi-humid farmland.The results showed that weed-control did not influence the biomass and grain yield of wheat but the effects of fertilization and cropping density were positively significant at the 0.01 level.The biomass and grain yield of wheat under normal density(150.0 kg seeds·ha-1) were 15.5% and 9.1% higher than these under low density(90.0 kg s...
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