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本文试图通过夏大豆密植试验,探讨与农业技术相适应的密植幅度,同时揭示能够充分利用光能的群体叶面积,以及在群体条件影响下个体的相应变化,为夏大豆的高产稳产提供依据.一、试验经过与方法本试验系1971年以来,于我所中等肥力、粘质壤土条件下进行的.品种主要是跃进4号(中等分枝型),供试密度达五次的有0.6、0.8、1.0、1.2、1.5、1.8、2.0和2.5万株/亩.研究中心内容:一是确定夏大豆合理的密度,了解和掌握奠基于个体生长的群体叶面积大小和进程;二是明确不同生产条件下具体的适宜密度.生育期间,除按时观察外,并定期对叶面积(重量法)、干物质重、光合生产率和植株生育性状进行了调查.近年来又增加了叶绿素含量(光电比色法)、表观光合强度(酸碱法)、消光系数K(门司氏法)和株间C0_2浓度(滴定法)的测定.叶绿素和光合强
This paper attempts to explore the close planting range compatible with agricultural technology through the summer soybean planting test, revealing the leaf area of the population that can make full use of light energy, and the corresponding changes of individual under the influence of population conditions. First, the test and the method of test The test since 1971, my medium fertility, clay loam conditions were mainly varieties Yuejin 4 (moderately branched), the test density of five times the 0.6, 0.8,1.0,1.2,1.5,1.8,2.0 and 25,000 plants / mu Research Center: First, determine the reasonable density of summer soybean, understand and master the size and process of leaf area based on individual growth groups; the second is clearly different The specific suitable density under the production condition.In the period of reproduction, in addition to the observation on time, the leaf area (gravimetric method), dry matter weight, photosynthetic productivity and plant growth traits were investigated regularly.In recent years, the content of chlorophyll Colorimetric method), apparent photosynthetic intensity (acid-base method), extinction coefficient K (Menth’s method) and C0_2 concentration (titration method) .Chlorophyll and photosynthetic capacity