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以紧凑型玉米品种郑单958为材料,以“金得乐”化控试剂为调控株型的手段,在紧凑型的基础上进一步优化玉米的株型,挖掘玉米的增产潜力。试验设为3个密度:60 000、75 000和90 000株/hm2,每个密度下设置相同的化控处理:T(6+12)6、12叶展期分别叶面喷施2.25和1.5mL/L“金得乐”(EC)试剂;T(6+8)6、8叶展期分别叶面喷施1.5mL/L EC试剂;CK对照不喷施。结果表明:在不同的密度下存在着不同的理想株型。中低密度下较为理想的株型为穗位低(占株高的40%),穗位层短即棒三叶叶间距小(占株高的17%),穗位层叶面积大(占整株叶面积的29%),穗上层叶片紧凑,叶间距大。高密度下较为理想株型为穗位低(占株高35%),穗下叶面积大(占整株叶面积的47%),穗位及穗上叶片紧凑,穗位叶面积较小(占整株叶面积的26%)、穗位及穗上叶间距大。
The compact maize variety Zhengdan 958 was used as the material and the “Jindele” chemical control reagent was used as a means of controlling plant type to further optimize the plant type of corn on the basis of compactness and tap the yield potential of maize. The test was set to 3 densities: 60 000, 75 000 and 90 000 plants / hm 2, with the same chemical treatment at each density: T (6 + 12) / L “Gold ” (EC) reagent; T (6 +8) 6,8 leaf foliar spraying 1.5mL / L EC reagent; CK control spray. The results show that there are different ideal plant types under different densities. The middle and low density of the ideal plant type is low ear position (accounting for 40% of plant height), short ear layer that is sticky three leaves leaf spacing (accounting for 17% of plant height), ear panicle area (accounting for Whole leaf area of 29%), the upper panicle leaves compact, large leaf space. Under high density, the ideal plant type was low ear position (accounting for 35% of the plant height), large leaf area under the ear (accounting for 47% of the whole plant leaf area), compact ear and upper ear leaves, Accounting for 26% of the whole plant leaf area), ear spacing and ear spacing on the leaves.