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以东农253为试验材料,在玉米9叶期喷施密高和KP(主要成分DCPTA和ETH),在玉米5个生育时期测定叶片光合酶活、内源激素及茎秆力学特性参数,并进行测产及相关性分析,探究大田条件下化控剂对玉米生长发育的影响。结果表明,喷施密高和KP后叶片SPAD、P_n、RuBPc和PEPc显著提高,增加叶片IAA、GA和ZR含量并降低ABA含量。玉米茎秆单位节间长度干物重、穿刺强度、横折强度和田间致倒伏推力有所增大,降低扁率及子粒含水量,密高和KP处理下玉米产量分别增加6.47%和9.23%。相关性分析表明,除ABA含量与产量呈显著负相关外,光合和其他激素指标呈显著正相关,PEPc、SPAD在完熟期与产量相关性最大,RuBPc在乳熟期与产量相关性最大,P_n在灌浆初期与产量相关性最大。
Dongnong 253 was used as test material to screen the leaf photosynthetic enzyme activity, endogenous hormones and stalk mechanical properties parameters in the 9 stages of maize, with dense Kp and KP (main components DCPTA and ETH) Measured yield and correlation analysis to explore the impact of chemical control agent on corn growth and development under field conditions. The results showed that the leaf SPAD, P_n, RuBPc and PEPc increased significantly after sprayed high density and KP, and increased the content of IAA, GA and ZR and decreased the content of ABA. The dry matter weight, puncture strength, transverse bending strength and field induced lodging thrust of maize stalk were increased, and the yield and grain water content of maize stalk were decreased. The yield of maize increased by 6.47% and 9.23% under the high and KP treatments respectively. Correlation analysis showed that there was a significant positive correlation between photosynthesis and other hormones except ABA content and yield, PEPc and SPAD had the highest correlation with grain yield at maturity, and RuBPc had the highest correlation with grain yield at milk ripening stage. P_n In the early filling and yield the most relevant.