continuous cropping

Accumulation of phenolic acids in soil of a continuous cropping Poplar plantation and their effects on soil microbes;

杨树人工林连作土壤中酚酸积累规律及对土壤微生物的影响

Effect of continuous cropping on photosynthesis diurnal changes of Opium poppy;

连作对罂粟光合速率日变化的影响

Influence of continuous cropping and rotation on soybean cyst nematode and soil nematode community structure;

连作和轮作对大豆胞囊线虫群体数量及土壤线虫群落结构的影响

The reasons for the change are the over applied fertiliz- er,poorly added organic manure,continuous cultivation,irrational irrigation,etc.

结果表明,随着连作年限的增加,温室土壤盐分表聚和酸化现象明显,土壤主要养分含量有增加的趋势。

The result showed that the population of Trichoderma in soil were obviously decreased after many years of continuous cultivation, while obviously increased in rotation plots.

在不同的农业措施下,对大豆播前、苗期、花期和成熟期的土壤木霉菌数量进行测定结果表明,多年连作后大豆田土壤中木霉菌数量有明显减少的趋势,而轮作大豆田土壤中木霉菌数量明显增加;采取秸秆还田、施有机肥和化肥等措施有利于大豆田土壤中木霉菌的繁殖,采用免耕和深松措施比常规耕翻有利于土壤中木霉菌的数量增多。