施钾量对玉米产量及叶片部分酶活性的影响

选用天津市主推玉米品种中单509,设置5个施钾水平,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,随着施钾量的增加,玉米产量先升高后下降,呈单峰曲线变化,当施纯钾量在67.50 kg/hm2时,产量达到最大。随着施钾量的增加玉米叶片SOD活性、POD活性、CAT活性都是先升高后下降,呈单峰曲线变化,SOD和POD活性以施纯钾量为67.50 kg/hm2时抽雄期为最高,CAT活性以施纯钾量为90.00 kg/hm2时抽雄期为最高,硝酸还原酶活性以施纯钾量为67.50 kg/hm2时拔节期达最高。不同施钾量处理对玉米叶片的酶活性及产量有显著的影响,施用适量的钾肥有利于玉米叶片的氮代谢和产量的提高。

Effects of Potassium Fertilizer on Enzyme Efficiency of Leaves and Yield in Spring Maize

The changes of the spring maize of Zhongdan509 leaves in each growth stage using five levels of potassium fertilizers sets were monitored. The results demonstrated that the yield possessed a close relationship with the increasing use of potassium, and showed a unimodal pattern in pace with potassium fertilizers supplement at the level of 67.50 kg/ha. Catalytic efficiency of SOD, POD and CAT could reach onto the maximum at the level of 67.50 kg/ha for potassium fertilizers in the form of a unimodal pattern. In detail, a level of 67.50 kg/ha for potassium fertilizers supplement could endow a maximum SOD and POD efficiency on tasseling stage, but for nitrate reductase efficiency on jointing stage, beside these, CAT catalytic efficiency could reach to a peak at the level of 90.00 kg/ha for potassium supplement on tasseling stage. All the results illustrated that potassium supplement possess significant relationship with yield and leaves enzyme efficiency, and suitable increased potassium supplement would be a best suggestion for enhancing nitrogen metabolism and yield.