种植密度对冬小麦根系的影响

在大田和盆栽条件下,研究了种植密度对冬小麦根系的影响。单株次生根随密度增加而减少,且因生育期进展其影响更为显著;群体(?)生根量生育前期与密度呈正相关,生育后期处理间差异不显著。根干重的变化趋势与次生根相同。根系的垂直分布,密植处理拔节前发展较快;而稀播在生育后期发展迅速,(?)深层根比较发达。稀播小麦的根系活力强于密植的。单株次生根数、根重均与单株穗粒数、粒重呈正相关关系。所以,适当稀播可以培育壮根,增强根系活力,充分发挥土壤、特别是深层土壤的作用。

EFFECTS OF DIFFERENT PLANT DENSITIES ON ROOT GROWTH IN WINTER WHEAT (TRITICUM AESTIVUM L.)

The effect of different plant densities on root growth in winter wheat was studied in field and pot culture experiments.The results indicated that the secondary roots per plant decreased with the increase of plant density, especially in the later growth period.The total number of secondary roots and the root dry weight of plants perarea were positively correlated with plant density in the early period, but the relationship mentioned above was not significant in the later period.The vertical distribution of root system of close-planted wheat was different from that of sparse-planted wheat.The roots of close-planted wheat extended rapidly before jointing, whereas, the roots of sparse-planted wheat developed rapidly from flowering to milk stage, especially, in the deep soil.The root activity of sparse-planted wheat was higher than that of close-planted wheat.Both secondary roots and root dry weight per plant were positively correlated with the number of grains and grain weight per plant.Therefore, properly sparse-sowing was favourable to cultivate strong roots, increase root activity and bring the yield-increasing function of soil, especially of deep soil into full play.