大豆残茬腐解液对大豆生长发育的自感效应

THE AUTOPATHY OF DECOMPOSED LIQUIDS OF SOYBEAN STUBS ON THE GROWTH OF SOYBEAN

通过恒温腐解 1个月所得的根茬腐解液处理大豆种子表明 :根茬腐解液显著地抑制了大豆种子的萌发 ,表现在胚根长度显著降低 ,抑制率达 4 1.79%。通过大豆腐解根茬盆栽试验表明 :与对照相比 ,大豆腐解根茬降低了大豆的根系活力 ,降低了大豆的抗逆性 ,表现在 ( -萘胺氧化酶活性下降 ;同时 ,腐解根茬使大豆植株的生物膜结构受到破坏 ,表现在叶片的相对电导率增加 ;产量分析结果也表明 :腐解根茬的综合效应使大豆产量和百粒重都较对照降低 ,差异极显著 ,达 11.16%- 2 4 .61%。由此表明了大豆根茬腐解物 (包括腐解的中间产物 )是大豆连作的主要自感物质之一。

In this study, soybean seeds were treated by decomposed liquids from soybean stubs under fixed temperature treatment for one month. The result shows that, the decomposed liquids inhabit the germination of soybean seeds significantly. The rates for five days reach 41.79%. In pot experiment, mixing earth with soybean stubs, shows that, compared with control, decomposed stubs reduced the soybean roots activities and adverse resistance which embody in dropping alpha-naphthylamine oxidase; At the same time, the decomposed stubs damage the structure of biomembranes which embody in increasing of the leaves relative electric conductivity. Depending on the results of yield analysis, the decomposed stubs can reduce yield and 100-seed weight than that of the control, the difference is significant, reaching 11.16%-24.61%. This shows that the decomposed compounds from soybean stubs are one of the main autopathic compounds of soybean continuous cropping.