Effects of Deep Loosening with Nitrogen Deep Placement on Root Growth, Grain Yield and Nitrogen Use Efficiency of Super High-yield Spring Maize
The effects of deep loosening with nitrogen deep placement on root growth, grain yield and nitrogen use efficiency of spring maizeat later growth stages, grown under super high-yield cultivation mode were introduced. With the growth of the advancement, root weight, root volume gradually began to decline after pollination, and demonstrated decreasing trend with the rise of soil depth in the same growth period. Plant root surface area(0 - 60 cm) appeared single apex after pollination, peak appeared at filling stage. On the whole, root activity increased at first and then decreased with the rise of soil depth, with growth progress, activity peak appeared decreasing. Deep loosening 30 cm, root weight and root volume and root surface area and root activity significantly increased, and nitrogen fertilizer applied 15 cm, promoted root growing down, and obviously improved the deep root vigor and proportion, especially for the 20-40 cm deep soil.
Spring maizeSuper-high yieldDeep looseningNitrogen deep placementRoot growth
NETL
NSTL
万方数据
维普
