ZHOU Chao,WANG Jun-qiang,HAN Ye-hui,et al.Effects of Planting Density and Growth Regulators on Stem Characters of Nendan 19[J].HEILONGJIANG AGRICULTURAL SCIENCES,2022,(04):8-12.[doi:10.11942/j.issn1002-2767.2022.04.0008]
种植密度和生长调节剂对嫩单19茎秆性状的影响
- Title:
- Effects of Planting Density and Growth Regulators on Stem Characters of Nendan 19
- Keywords:
- maize; stalk traits; plantingdensity; plant growth regulator
- 文献标志码:
- A
- 摘要:
- 为了明确种植密度和植物生长调节剂对玉米茎秆性状的影响，本研究以玉米品种嫩单19为材料，设置3个密度水平，以及乙烯利矮壮素复配剂（EC）和喷施清水（CK）2个处理，研究植物生长调节剂和种植密度对嫩单19茎秆性状的影响。结果表明：随种植密度增加，玉米株高增加、重心高度上移、基部节间伸长、基部节间充实度和抗折力下降。EC处理显著降低了地上部第6节以下的节间长度，显著增加了地上部第7节以上的节间长度，株高略降低，重心高度和穗位高显著降低，基部节间长度缩短，从而提高了茎秆的抗倒伏能力。由此可见，在风灾倒伏频发地区以及种植密度过大等倒伏风险较大条件下，喷施植物生长调节剂可显著增加玉米茎秆的抗折力和茎秆外皮穿刺强度，显著降低穗位高、重心高度和倒伏率，有利于玉米高产稳产。
- Abstract:
- In order to clarify the effects of planting density and plant growth regulators on the stalk traits of maize variety Nendan 19,in this study,the maize variety Nendan 19 was selected,and 3 density levels were set and etheph on two treatments of meridian compound (EC) and spraying clear water (CK) were used to study the effects of plant growth regulators and planting density on the stem traits of Nendan 19.The results showed that with the increase of planting density,the plant height of maize increased,the height of the gravity center moved up,the elongation of the basal internodes,the fullness of the basal internodes and the bending resistance decreased.EC treatment significantly decreased the length of internodes below the sixth node above the shoot,significantly increased the length of the internode above the seventh node above the shoot,slightly decreased the plant height,significantly decreased the height of the center of gravity and the height of the ear,and shortened the length of the basal internode.Thus,the lodging resistance of the stem was improved.It could be seen that under the conditions of high lodging risk such as frequent wind disaster lodging and excessive planting density,spraying plant growth regulators could significantly increase the flexural strength of corn stalks and the puncture strength of stem outer skins,and significantly reduce the ear position,gravity center height and lodging rate were conducive to high and stable maize yield.
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备注/Memo
收稿日期：2021-12-28
基金项目：国家现代农业产业技术体系（CARS-02-46）；黑龙江省应用技术研究与开发计划（GA20B102-05)。
第一作者：周超（1986-），女，硕士，助理研究员，从事玉米遗传育种研究。E-mail：zhouchao1201@126.com。