摘要
辽西北地区是玉米早衰的高发地区。通过大田定位施肥试验,对春玉米生育后期穗位叶叶绿素含量、保护酶活性、根系干重和叶片枯黄比例进行调查,结果表明,随着施氮量的增加,叶绿素含量、根系干重都呈增加的趋势,黄叶比例逐渐下降;SOD、POD活性在灌浆期、乳熟期和蜡熟期随玉米生育期的推进呈逐渐降低的变化趋势;施氮量240 kg/hm2可明显提高SOD、POD活性,叶绿素含量、根系干重都达到较高值,黄叶比例最低,有效延缓了玉米叶片的衰老速度,籽粒产量最高达到9 284 kg/hm2,与无肥对照比较增产40.09%。
Premature senescence is a major reason of low yield of spring maize, especially in Northwest Liaoning. The experiment was carried in field, ear leaf chlorophyll content, protective enzyme activity, root dry weight and leaf scorch proportion in the dough stage of spring maize were investigated. Results showed that with the increase of nitrogen level, chlorophyll content, root dry weight increased, leaf scorch proportion decreased; the activities of superoxide dismutase （SOD）, peroxidase （POD） reduced at filling stage, milky stage and dough stage. When the nitrogen amount was 240 kg/hm, the activities of SOD, POD could be obviously improved, chlorophyll content, root dry weight achieved higher value. Leaf scorch proportion was the lowest, could defer decrepitude effectively the aging of leaves in late growth stage. The highest yield of maize could be up to 9 284 kg/hm, increased by 40.09% compared to no fertilizer.
出处
《广东农业科学》
CAS
CSCD
北大核心
2014年第7期16-19,共4页
Guangdong Agricultural Sciences
基金
国家科技支撑计划粮食丰产科技工程项目(2006 BAD02A12
2011BAD16B12)
关键词
施氮量
叶绿素
保护酶活性
早衰
N application level
chlorophyll
protective enzyme activity
premature senescence
