大豆重迎茬减产的原因及农艺对策研究——重迎茬大豆的根系分泌物与根茬腐解物

摘要

The experiments had been carried out for 8 years in 9 fixed rotation fields and 6 ecological regions of Heilongjiang Province by comprehensive tests, special research, pot experi- ment, laboratory analysis, and series of field experiments. The re- sult showed that： （1） When the soybean was planted continuous- ly, root secretion was more than that in normal rotation, which would be disadvantageous to growth and development of soybean and the system of microorganism in soil. Also, it would effect the activation of microelements in soil. （2） decaying substance of stubble effected on growth of soybean and activation of soybean roots disadvantageously, and reduced yeild of soybean significantly. All of this told us that the root secretion and decaying substance of stubble effect on growth and development of soybean and yield determinately, and they are one of the important reasons to reduce yield of soybeans planted continuously and al- ternately.%通过连续8年在黑龙江省6个生态区9个固定轮作场圃综合试验,试验区专项研究,框区、盆栽试验,实验室分析,以及大量的大面积生产调查,发现大豆重迎茬种植根系分泌物增加,且对大豆生长发育及土壤微生物区系有不利的影响,同时也影响到土壤微量元素的活化;根茬腐解物对大豆的生长和根系活力都有不利的影响,并使大豆的产量明显降低。研究结果表明,根系分泌物和根茬腐解物对重迎茬大豆的生长发育和产量有一定的影响,它们也是造成大豆重迎茬减产的一个原因。