【摘要】 在中等土壤肥力下对隆玉2号玉米的干物质积累与养分吸收特性进行研究。试验结果表明,植株干物质和养分吸收量随着生育期延长而持续增加,动态变化可用Logistic方程拟合;干物质积累速率前期上升快,至高峰后缓慢下降;氮、钾吸收速率高,上升快,下降也快。磷吸收速率低,上升慢,下降也慢;养分最大吸收速率出现的时间,钾最早,氮次之,磷最晚,但均早于干物质最大积累速率出现时间;抽雄吐丝后N、P2O5主要分配在籽粒中,而K2O在籽粒中的分配量很少;干物质、N、P2O5、K2O的转移率分别为14.28%、40.41%、47.47%、37.04%;每100 kg籽粒吸N 1.65 kg、P2O50.56 kg、K2O 1.40 kg;较佳的施肥方法是:氮肥要多次分期施用,“适量种肥、前轻、中重、后补”;磷肥作基肥或种肥一次施用;钾肥要求“适量种肥,前轻中重”,最好在抽雄吐丝前全部施完。更多还原

【Abstract】 The laws on dry matter accumulation and nutrient uptake of Longyu No.2 were studied under middle level of fertilizer.The results were as follows:the dry weight（excepting roots） and nutrient uptake amounts of each plant were continuously increased with plant growth,dynamics of dry matter accumulation and nutrient uptake amounts could be described by Logistic curve equations.The rate of dry matter accumulation was increased fast at early stage,and gradually decreased after reaching the peak.The uptake rate of N and K₂O was higher,and their increase and decrease were both fast while P₂O₅ was in reverse case.The time of maximum uptake rate appeared earlier for K₂O,followed by N,and then by P₂O₅.In any case,uhe time of maximum nutrient uptake rate appeared earlier than the dry matter.After spinning,N and P₂O₅ were mainly distributed in grains but K₂O was very little.Rate of transference of dry matter,N,P₂O₅ and K₂O were 14.28 %,40.41 %,47.47 % and 37.04 %,respectively.The amounts of N,P₂O₅,K₂O absorbed by maize plants for the production of 100 kg maize grains were 1.65 kg,0.56 kg and 1.40 kg,respectively.A better way of using fertilizer was that all P₂O₅ was fertilized in a time used as base manure,N and K₂O were used in several times and all K₂O should be used before spinning stage.更多还原