培土高度对玉米节根数量和直径的影响

Analysis of earthing-up effects on number and diameter of nodal roots in spring maize

中耕培土是我国玉米生产中广泛应用的耕作方法之一,培土在大田管理中占有重要地位。本文采用田间试验,选用玉米品种郑单958 (ZD)和先玉335 (XY),利用PVC管,研究不同培土高度对玉米节根数量和直径的影响。试验中培土高度分别为8 cm (H1)和15 cm (H2),不培土植株为对照(CK)。研究结果表明:培土高度对单株玉米节根总数产生显著影响。与CK相比,培土植株的单株节根数显著增加,其中H2处理的节根数最高,与CK相比较,H2处理使郑单958的单株节根总数增加了13. 8%,先玉335增加了7. 4%。这种增加主要是第九层次生根数量的增加所致;培土对单株节根数量的影响存在品种间的差异。与CK相比,培土高度使第八层和(或)第九层次生根直径下降,且存在品种间差异。

Ridge -till with earthing -up is a widely used practice in maize production, while earthing up is also a key practice in crop produetion. To understand the effects of earthing - up height on the number and diameter of nodal roots in maize, a field experiment, by using PVC tube, was conducted with following treatments： 2 maize varieties, Zhengdan 958 （ZD） and Xianyu 335 （XY） ; 3 er- athing -up heights, H1 （8 cm） and H2 （15 cm） and CK （no earthing -up） . The results showed that the earthing -up height sig- nificantly influeneed the total number of nodal roots per plant. Compared with CK, the number of nodal roots of plant with earthing - up treatments increased significantly, and the number of nodal roots in Zhengdan 958 and Xianyu 335 with H2 treatment was increased by 13.8% and 7. 4% respectively, which was mainly due to the increased number on the ninth phytomer though the effects varied be- tween maize varieties. Compared with CK, earthing up treatments significantly decreased the diameter of nodal roots on the eighth and （or） ninth phytomers and differences between maize varieties also existed.