种植密度对杂种小麦C6-38／Py85-1群体生长和籽粒产量的影响  

Effects of Planting Density on Population Growth and Grain Yield of Hybrid Wheat C6-38/Py85-1

作　　者：张永丽[1] 蓝岚[2] 李雁鸣[1] 肖凯[1] 

机构地区：[1]河北农业大学农学院 [2]河北保定师范专科学校,河北保定071051

出　　处：《麦类作物学报》2008年第1期113-117,共5页Journal of Triticeae Crops

基　　金：国家粮食丰产科技工程项目(2004BA520A07);河北省博士基金项目(98540173D)

摘　　要：为确定杂种小麦合理栽培密度，在大田条件下，研究了种植密度对杂种小麦群体生长和籽粒产量的影响。结果表明，在试验密度范围内（150～450株／m^2），杂种的群体总茎数（PS）、叶面积指数（LAI）、群体干物重（PDW）和光合势（PP）均以低密度处理（150株／m^2）最低。杂种小麦高密度处理（450株／m^2）的PS始终高于中密度处理（300株／m^2），LAI和PP则在挑旗期前高于中密度处理，之后低于中密度处理；PDW在开花期前高于中密度处理，之后两处理间无显著差异。杂种小麦低密度处理的生长率（CGR）在拔节期前低于中、高密度处理，但在拔节期后，低密度与中密度处理间无显著差异，均高于高密度处理。杂种小麦中、高密度处理各生育时期PS的离中优势（Hm）均为负值，低密度处理冬前期、拔节期、开花期和成熟期分别为11．6％、5．9％、9．8和13．5％。除开花期PDW的Hm中密度和高密度处理间差异不显著外，其余各时期LAI和PDW的Hm均随密度增加而降低。杂种小麦的籽粒产量以中密度处理最高，但与低密度处理间无显著差异，高密度处理最低。产量的Hm随密度增加而降低。生产中采用较低的密度有利于杂种小麦群体生长和产量杂种优势的发挥。In order to clarify the effects of planting brid wheat C6-38/ Py85-1, a field experiment was results showed that the total number of population weight （PDW） and photosynthetic potential （PP） density on population growth and grain yield of hyconducted during whole wheat growth period. The stems （PS）, leaf area index （LAI）, population dry of hybrid were the lowest under low density treatment （150 plants·m^-2）. PS were higher under high density treatment （450 plants·m^-2） than that under medium density treatment （300 plants·m^-2）. LAI and PP were higher under high density treatment than under medium density treatment before flag leaf expansion, but lower after this stage. PDW was higher under high density treatment than that under medium density treatment before anthesis, but there was no significant difference after this stage. The crop growth rate （CGR） of hybrid was lower under low density treatment than that under medium and high density treatments before jointing, but after this stage there was no significant difference between low density treatment and medium density treatment, and higher than that under high density treatment. Under medium and high density treatments, PS had no mid-parent heterosis （Hm）, while under low treatment, it had the positive mid-parent at the growth stages. The Hm of LAI and PDW increased significantly with the increase of planting density, except that the Hm of PDW had no significant difference between medium density treatment and high density treatment at anthesis stage. The grain yield of hybrid was the highest under medium density treatment and the lowest under high density treatment, and there was no significant difference between low density treatment and medium density treatment. The Hm of grain yield increased significantly with the increase of planting density. In production of hybrid wheat, the relative low planting density should be applied to increase the heterosis of population growth and yield.

关 键 词：杂种小麦 种植密度 群体生长 籽粒产量 

分 类 号：S512.1[农业科学—作物学] S318