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选用天津市主推玉米品种中单509,设5个施磷水平,测定不同生育期叶片的硝酸还原酶(NRase)、超氧化物歧化酶(SOD)、过氧化物酶(POD)和过氧化氢酶(CAT)活性及玉米产量。结果表明,随施磷量的增加,玉米产量先升高后下降,呈单峰曲线变化,施纯磷量在75 kg/hm~2时中单509产量达到最大。随施磷量的增加,叶片SOD、POD、CAT、硝酸还原酶活性均先上升后下降,呈单峰曲线变化。施纯磷量在105 kg/hm~2时,大喇叭口期叶片POD活性最高;施纯磷量在75 kg/hm~2时,抽雄期叶片SOD活性和CAT活性、拔节期叶片硝酸还原酶活性最高。不同施磷量处理对玉米叶片的酶活性及产量有一定影响,增施适量磷肥有利于玉米叶片的氮代谢和玉米产量提高。
In this experiment, the main poplar variety “Zhongdan 509” was selected in Tianjin to set five phosphorus levels. The contents of NRase, superoxide dismutase (SOD), peroxidase (POD) and hydrogen peroxide Enzyme (CAT) activity and maize yield. The results showed that with the increase of phosphorus application, the yield of maize firstly increased and then decreased, showing a single peak curve. When the content of pure phosphorus reached 75 kg / hm ~ 2, the yield of maize reached the maximum. With the increase of phosphorus application, the activities of SOD, POD, CAT and nitrate reductase in leaves firstly increased and then decreased, showing a single peak curve. The POD activity was the highest at 105 kg / hm ~ 2 phosphorus application, and at the level of 75 kg / hm ~ 2, the activities of SOD and CAT were the highest at the leaf stage and the nitrate reductase activity at the jointing stage was the highest. Different application rates of phosphorus had some effect on the enzyme activity and yield of maize leaves. Adding appropriate amount of phosphate fertilizer was beneficial to nitrogen metabolism and corn yield of maize leaves.