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| The effect of various fertilization treatments on weed species composition of early rice crops were investigated in experimental plots established 26 years previously in Wangcheng county, Hunan province, China. The treatments examined influenced weed flora composition and density. Multivariate analyses showed that changes in the weed community composition were primarily due to light intensity on the field surface, followed by soil available P and N. More weed species and total weed density were observed in the control and NK plots, but less weed species and total density were found in the plots in which N, P, and K were applied together. Omission of P-application had more important influence on the weed community compared with the omission of N-, or K-application. Nutrient source from synthetic fertilizers and organic manure or lime application had no obvious effect on the weed community. |
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| Keywords:Weed community;Light intensity;Soil macronutrient;Nutrient source;Early rice |
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