容重对玉米植株养分吸收的影响

Effect of Soil Bulk Density on Nourishment Absorption of Maize

以棕壤为试材,采用盆栽的方式研究了容重对玉米根、茎、叶、种子中N、P、K元素吸收的影响,结果表明:随设计容重增加,在相同生育期同一玉米生理部位同一元素的积累下降,除根、茎中K含量随生育期先下降后上升外,其它元素含量在玉米生育期都下降。试验土样在设计容重小于1.3 g·cm-3时,容重对各项指标影响差异较小。各种元素在玉米不同生理部位随生育期变化有相对滞后现象,所以,对不同肥料的田间管理应该在作物相应生育期提前进行。

Taken tillage brown soil as tested objects, the effects of bulk density on the absorption of N, P, K elements in the roots,stems, leaves and seeds of maize were studied by using the method of plot experiment. The results showed that with the increase of the designed bulk density,the same element accumulation of the identical corn physiological parts declined in the same growth period,in addition to stem and root content of K which decreased at the initial stage and then increased, the other elements declined in the maize growing period. There had no obvious effect on maize element absorption when soil bulk density was less than 1.3 gcm -3. The absorption of various elements betwecn physiological parts of maize had relative hysteresis phenomena in maize grow＆ period,so fextilizer management would be in advance ac- cording to it.