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近年来,上海郊区复种指数增加,作物产量明显提高,化肥和机械对土壤肥力的影响亦随之增加。据研究,郊区多数土壤的养分供给能力随着化肥和有机肥用量的增加,而逐步有所提高。即现代集约农业中,土壤养分供给能力,可以通过大量施用化肥来维持和改善。但对土壤物理性质的影响却不太清楚。为此,我们从1979年4月起,在上海郊区青紫泥土壤上作了三年八季作物的定位试验,以研究长期施用化肥、有机肥和无肥对土壤物理性的影响。
In recent years, the index of multiple cropping in suburbs of Shanghai has been increased, crop yield has been significantly increased, and the impact of fertilizers and machinery on soil fertility has also increased. According to the study, the nutrient supply capacity of most soils in the suburbs gradually increased with the increase of the amount of fertilizers and organic fertilizers. In modern intensive agriculture, the soil nutrient supply capacity can be maintained and improved through the large-scale application of fertilizers. However, the impact on soil physical properties is not clear. Therefore, from April 1979, we conducted a three-year positioning experiment of eight seasons crops on the soil of Shanghai suburbs to study the effects of long-term application of fertilizers, organic fertilizers and no fertilizers on soil physical properties.