国审超高产新品种新麦29灌浆特性分析

Analysis of Grouting Laws of New Variety Xinmai 29 with Super-high Yield

[目的]分析国审超高产新品种新麦29灌浆特性。[方法]以新麦29为试验材料,研究了其籽粒形成和灌浆规律,叶片组成、干物质积累的动态变化。[结果]在超高产条件下,新麦29籽粒灌浆期长,粒重增加快,每日每千粒增重平均达2.3 g;新麦29叶片上挺,透光性好,上三叶功能期长,特别是旗叶功能期更长。在超高产栽培条件下,叶面积系数达7.75,上三叶叶面积系数为5.06,旗叶叶面积系数1.72;小麦籽粒灌浆所需要的干物质主要来自开花后的光合水平产物。[结论]新麦29在7 200~9 115 kg/hm2产量水平下表现最稳定;其产量构成最佳模式为:有效穗数611.5万/hm2以上,穗粒数32.3粒左右,千粒重50.5 g左右。

[Objective]To analyze the grouting laws of new variety Xinmai 29 with super-high yield. [Method] With Xinmai 29 as the test materials,we researched the dynamic changes of seed formation,grouting laws,the dynamic changes of leaf composition,and dry matter accumulation. [Result] Under the super-high yield condition,Xinmai 29 had a long period of grain filling,and the weight of grain in filling stage increased fast with an average of 2. 3 g of 1 000-grains per day; the leaves of Xinmai 29 stuck out and had good light transmittance,and the top-three leaves had long functional period. Under the super-high yield condition,the index of the leaf area came to 7. 75,the index of the top-three leaf was 5. 06 and the index of the flag leaf was 1. 72; the dry matter weight of Xinmai 29 was mainly from the photo-synthate after flowering. [Conclusion] Xinmai 29 was most stable under the yield level of 7 200-19 115 kg/hm2. The optimal mode of yield structure was effective spikes more than 6115 000 spikes/hm2,32. 3 grains per spike and 1 000-grain weight around 50. 5 g.