不同磷浓度对玉米生长及磷、锌吸收的影响

在不同磷水平（0.1、1.0、5.0、10和100 μmol·L^-1 P）的水培液中培养玉米苗，测定不同培养时期玉米的生长和玉米植株对P、Zn吸收和利用效率.结果表明，玉米在100 μmol·L^-1 P的溶液中生长速率最大，而根冠比在0.1 μmol·L^-1 P的溶液中为最大.随着水培液中P水平的增加，植株对P的吸收速率增加，而利用效率降低；玉米根系含Zn量增加，而冠层含Zn量变化不大，说明增P使Zn在根内富集，Zn向冠层转移速率较小，玉米幼苗根系中P和Zn的浓度呈正相关关系.

Maize growth and phosphorous-and zinc uptake under different phosphorous supply levels

By the method of solution culture, this paper studied the P and Zn uptake of maize at its growth stages under different P supply levels. The results showed that maize growth reached its maximum at the supply level of 100 micromol P.L(-1), while the root/shoot ratio was the highest at 0.1 micromol.L(-1) P supply. Increase of P concentration in culture solution promoted the uptake of P, but decreased its utilization rate. The Zn content in root increased with increasing P supply, while that in shoot varied little, which meant that the Zn transportation rate from root to shoot had little change with increasing P concentration. There was a positive correlation between the concentrations of Zn and P in maize seedling roots.