杂草稻与栽培稻的地下营养竞争

Research on Nutrient Competition between Root of Weedy Rice and that of Cultivated Rice

本文以栽培稻沈农265和杂草稻WR04-12为试验材料,采用盆栽试验,研究杂草稻竞争对栽培稻根部干物质积累及营养吸收的影响。结果表明,相同氮肥处理下,杂草稻根部吸收养分的能力明显强于栽培稻沈农265。杂草稻竞争使栽培稻根部氮、磷、钾积累量显著降低。增加施氮量对杂草稻和栽培稻根部的营养吸收均具有显著促进作用,但相对更有利于杂草稻。

A pet experiment was conducted to study the effects of dry matter accumulation and nutrition uptake in the roots of Shennong 265, the cultivated rice under competitive conditions of WR04-12, the weedy rice. Results showed that the nutrient uptake abilities of weedy rice roots were much higher than those of the cultivated rice roots by the same nitrogen treatment. The accumulation of nitrogen, phosphorus and potassium in cultivated rice roots decreased significantly under the competitive condition of weedy rice. The increasing effects of nutrient up- take abilities of both weedy rice roots and cultivated rice roots were significant by the increase of nitrogen levels, and the promoting effects on nutrient uptake were relatively more obvious in weedy rice roots than those in cultivated rice.