关键词: 土壤容重, 玉米, 养分, 吸收, 分配

Abstract: Abstract:The study was carried out using pool cultivation under field exposure to indicate the influences of soil bulk density in deep soil layers on the absorption and redistribution of nitrogen,phosophrous and potassium in maize.The soil structure was made of 3 differernt soil layers,0-20cm,20-40cm and 40-60cm with different soil BD(bulk density).The main results showed that soil BD had a great effect on the absorption of N,P,K in maize, represented significantly in silking stage,and the order of this effect was K> P > N,The accumulation of N,P,K differed among the 5 treatments wtith the order T224>T244>T226>T246>T266,and this difference reached significant level.Soil BD also affected redistributive proportion and transferring rate of N,P,K in the different parts,especially in the centre growth, of corn plant in each stage,the redistributive proportion of N,P,K decreased with the increase of soil BD,and it always exhibited the highest proportion in T224 and the lowest in T266.Adjustment of soil BD in the deep soil layers can make the corn plant absorb more mineral nutrition,distribute more in the centre growth,and promote the growth of corn plant.

Key words: soil bulk density, maize, nutritive absorption, nutritive redistrubution