CAJ | 학술논문

以玉米品种“郑单958”为材料，在大田条件下，研究了乙烯利(0和180 g hm–2)和氮肥水平(0、75、150和225 kg N hm–2)对夏玉米产量、氮素吸收和利用以及SPAD值的影响。结果表明，乙烯利处理显著降低了氮吸收量和吸收效率，但显著提高氮利用效率，其中乙烯利处理氮农学效率比对照提高了32.7%~34.6%，而且乙烯利处理对玉米产量及其产量构成因素没有显著影响；随着施氮量增加，夏玉米产量、产量构成因素和氮吸收量显著增加，而氮吸收效率、氮利用效率、氮偏生产力和氮农学效率随之降低，其中225 kg N hm–2处理氮吸收量比0 kg N hm–2处理提高了68.4%~91.8%，但225 kg N hm–2和150 kg N hm–2处理之间的氮吸收量差异不显著。乙烯利和氮肥对氮吸收量、氮吸收效率和氮农学效率具有互作效应。喷施乙烯利和增施氮肥均能提高灌浆期穗位叶 SPAD 值，但两者之间没有互作效应。通过相关性分析表明，夏玉米产量与吐丝期氮吸收量、收获期氮吸收量、灌浆期穗位叶SPAD值显著正相关。
이옥미품충“정단958”위재료，재대전조건하，연구료을희리(0화180 g hm–2)화담비수평(0、75、150화225 kg N hm–2)대하옥미산량、담소흡수화이용이급SPAD치적영향。결과표명，을희리처리현저강저료담흡수량화흡수효솔，단현저제고담이용효솔，기중을희리처리담농학효솔비대조제고료32.7%~34.6%，이차을희리처리대옥미산량급기산량구성인소몰유현저영향；수착시담량증가，하옥미산량、산량구성인소화담흡수량현저증가，이담흡수효솔、담이용효솔、담편생산력화담농학효솔수지강저，기중225 kg N hm–2처리담흡수량비0 kg N hm–2처리제고료68.4%~91.8%，단225 kg N hm–2화150 kg N hm–2처리지간적담흡수량차이불현저。을희리화담비대담흡수량、담흡수효솔화담농학효솔구유호작효응。분시을희리화증시담비균능제고관장기수위협 SPAD 치，단량자지간몰유호작효응。통과상관성분석표명，하옥미산량여토사기담흡수량、수획기담흡수량、관장기수위협SPAD치현저정상관。
A field experiment using maize hybrid Zhengdan 958 was conducted to study effect of ethephon (0 and 180 g ha–1) and nitrogen fertilizer (0, 75, 150, and 225 kg N ha–1) on summer maize yield and yield components, nitrogen uptake, nitrogen use and SPAD value. The results showed that ethephon significantly decreased nitrogen uptake and N uptake efficiency, whereas markedly increased N utilization efficiency. N agronomic efficiency under ethephon treatment was 32.7%–34.6% more than that under con-trol, and ethephon had no negative effect on maize yield and yield components. With increase nitrogen fertilizer of application, maize yield, yield components and nitrogen uptake were increased, but N uptake efficiency, N utilization efficiency, N partial factor productivity and N agronomic efficiency were decreased. Nitrogen uptake under 225 kg N ha–1 treatment was 68.4%–91.8% more than that under 0 kg N ha–1. However there was no difference for nitrogen uptake between 225 kg N ha–1 and 150 kg N ha–1 treatments. Significant effect of ethephon × nitrogen was observed on nitrogen uptake, N uptake efficiency and N agronomic efficiency. Ethephon as well as higher nitrogen rate increased SPAD value of ear leaf during grain filling stage, while there was no significant interaction between ethephon and nitrogen fertilizer on SPAD value. Correlation analysis indicated that summer maize yield was significantly positively correlated with nitrogen uptake at silking stage and harvest stage and with SPAD value of ear leaf.