The available nutrients decreased in the growing season, available N was depleted and available P, K were enriched in rhizosphere, which decreased gradually with the phonological progress.

• 生长季内速效性养分整体呈下降趋势，根际碱解氮亏缺明显，而根际速效磷、速效钾相对富集，这种作用亦随生育期推进逐渐减弱。