长期轮作和连作对土壤中 大豆胞囊线虫数量的影响

在白浆土设计长期轮作和连作试验区,采取麦麦豆油玉豆6区轮作和麦玉豆连作, 18a内连续调查土壤 中大豆胞囊线虫( SCN)的胞囊数量,观察轮作或连作对土壤中SCN胞囊数量的影响。试验结果表明,长期轮作使 土壤中胞囊数量有减少的趋势,各茬口间胞囊数量变化幅度减小,轮作12a后土壤中胞囊数量达到动态平衡;大豆 连作的前2a土壤中胞囊数量急速增加,以后缓慢增加, 7a后有下降趋势, 14a后土壤中的胞囊数量在较高水平上趋 于平衡;小麦或玉米连作前3a土壤中的胞囊数量呈快速下降, 4a后缓慢减少, 14a后土壤中胞囊数量极少。

The influence of soil on the long-term rotation and continuous cultivation on soybean cyst nematode

The quantity of Heterodera glycines Ichinohe(SCN) in soil after long-term rotation cultivation(wheat-wheat-soybean-rape-corn-soybean) and continuous cultivation(wheat,corn,soybean) in albic soil was investigated.The reaserch showed that SCN cyst quantity tend to reduce in long-term rotation cultivation.SCN cyst quantity reduced in different crop stubble of shift scale.After 12 years,SCN cyst quantity reached the dynamic balance.SCN cyst quantity increased rapidly in the first 2 years,then the increase became slower.After 7 years,the SCN cyst quantity decreased,tended to be balanced in 14 years.SCN cyst quantity descreased rapidly in the first 3 years in continuous cultivation of wheat or corn.After 4 years,the reduction became slower.After 14 years,only few SCN cyst was detected.