摘要： NP作种肥以及0.1%Zn⁺⁺,BR(油菜素内酯)浸种均可提高玉米的耐冷性.低温胁迫下,NP、Zn⁺⁺及BR处理均能降低叶细胞质膜透性,增加叶绿素含量,降低气孔阻力,使光合速率有所提高,单株籽粒产量增加.晚播玉米开花期叶面喷施0.5%PK、20ppmGA₃、0.05%Zn⁺⁺、1ppmBR皆有缓解低温影响,增加可育粒,减少秕粒和秃尖,以及增加百粒重的作用.

关键词: 玉米, 耐冷性, 矿质营养, 生长调节剂

Abstract: Treatments of NP as seed manure and soaking maize seeds with Zn++ (0.1%), BR (Brassinolide) (1, 0.1, 0.001Ppm) before sowing could increase cold tolerance of the plant. Compared with the control, under cold-stress environment, these treatments could all reduce protoplasmic membrane permeability of leaf cell, also increase the chlorophyll content and decrease stomatic resistance, thus increasing photosynthetic rate and adding kernel yield per plant. Spraying the leaves of late-sowing maize with PK (0.5%), GA3 (20ppm), Zn++ (0.05%) and BR (Ippm) at flowering stage could alleviate low temperature effect, raise fertile grains, decrease shrunken grains and the length of barren tip of ear and increase one hundred grains weight.

Key words: Maize, Cold tolerance, Mineral nutrition, Growth regulator