Lodging of summer maize and the effects on grain yield | 玉米倒伏及其对产量的影响
2011
Cheng Fuli, Agricultural University of Hebei, Baoding(China), College of Agronomy | Du Xiong, Agricultural University of Hebei, Baoding(China), College of Agronomy | Liu Mengxing, Agricultural University of Hebei, Baoding(China), College of Agronomy
chinois. 摘 要：采用试验与生产调查相结合的方法，分析倒伏玉米植株性状表现及对产量的影响，研究种植密度、品种选择和氮钾肥对玉米抗倒伏的影响。结果表明，不同品种问抗倒伏能力存在显著差异，株高和穗位高不能作为评价品种抗倒伏能力强弱的主要指标，茎秆基部节间粗和长粗比值小的品种具有较强的抗茎折能力；随着密度的提高，植株的抗倒伏能力下降；氮钾肥配施能有效提高茎秆的抗倒伏能力。玉米吐丝1周后倒伏品种的穗粒数、千粒重、穗粒重分别降低19．4％～30．2％、29．6％～31．8％、45．0％～50．8％。
Afficher plus [+] Moins [-]anglais. The apparent characters of lodging maize plant, the effects of planting density, variety selection, and nitrogen-potassium combined application on stem-lodging resistance and grain yield were analyzed. The results showed that there was significant difference among different maize hybrids. Plant height and ear height should not be regarded as the major indexes to evaluate the lodging resistance of maize, and the stalk breaking resistance of the hy- brid was strong which was characterized as a thick basal stem and a small value of internodes length/diameter. The lodging resistance of summer maize decreased with the planting density increasing. The nitrogen-potassium combining application could improve the lodging resistance effectively. The lodging grain number per spike, 1 000-grain weight and grain weight per spike after silking in one weeks time could decrease 19.4% - 30.2% ,29.6% - 31.8% and 45.0% - 50.8%, respectively.
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