油菜幼苗对硼的吸收与运转及钙的影响

硼促进油莱幼苗生长和对N、P、K、Ca营养元素的吸收。当油莱生长介质中钙浓度增大时，植株吸硼量和硼在新叶中的积累减少，老叶中积累增加。硼在油莱体内的运转系数在低硼条件下较大，并随钙处理水平的增加而下降。结果表明，在硼素供应有限的条件下，油菜体内硼仍具-定的移动性，钙则使硼的吸收和移动性下降。

Boron Absorption and Mobility in Rape Seedlings as Affected by Calcium

The effect of calcium on the absorption of boron by the rapeseedlings, and mobility of boron in plants were studied in this paper. Boron enhanced the absorption of N, P, K, Ca. Boron uptakeand accumulation in young leaves were reduced, while in oldleaves were increased when the calcium concentration of the medium was increased. There translocation index ( ratio of bown concentration in young leaves: old leaves ) of boron was greater inmedium containing 0.025 ppm B than in 0.5 ppm B, and it decreascd when there calcium was increased. These results showed that B isremobilized under boron deficiency, and boron translocation fromold leaves to young leaves appeared to be inhibited by high concentraction of calcium.