CASE-STUDIES ON THE FLOW AND SUPPLY OF NITROGEN IN ALTERNATIVE FARMING IN SWEDEN .1. SKILLEBY-FARM 1981-1987

被引：21

作者：

GRANSTEDT, A

机构：

[1] Department of Ecological Agriculture, Swedish University of Agricultural Sciences, Uppsala, 750 07

来源：

BIOLOGICAL AGRICULTURE & HORTICULTURE | 1992年 / 9卷 / 01期

关键词：

D O I：

10.1080/01448765.1992.9754616

中图分类号：

S3 [农学（农艺学）];

学科分类号：

0901 ;

摘要：

Case studies examining nitrogen supply dynamics were carried out on two biodynamic farms in Sormland (for a 7 year rotation period on one farm and 3 years on the other) and on one biodynamic farm in Skane (for 3 years) in Sweden. Each of the farm locations had a different set of climatic and soil conditions. Two conventional farms. one with and one without livestock, served as controls in each of the two areas. In this paper results from the biodynamic farm in Sormland are presented. Changes in soil mineral nitrogen, nitrogen uptake by the crop and productivity were studied in relation to previous crops, crop rotations, and nitrogen fixation. A nitrogen balance and flow of nitrogen in the farm ecosystem is presented. For a farm to meet its nitrogen needs without resorting to the use of artificial fertilizers requires that nitrogen be effectively recycled within the farm with only small losses; that enough nitrogen-fixing crops be cultivated (legumes on a third of the area in the circulation); and that the intensity of livestock management is adjusted on the basis of the farm's feed production capacity.

引用

页码：15 / 63

页数：49

共 28 条

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