유기 한우 사육농장의 순환 유형별 질소 수지 평가
Assessment of Farm-Gate Nitrogen Balance of Organic Hanwoo Farms at Different Recycling Farming Types
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The aim of the study was to assess whole farm nitrogen (N)-balance in organic Hanwoo farms of different recycling types. N input, output and within-farm N flows were calculated as a farm-gate balance on 12 organic Hanwoo farms. The observed farms were divided into three groups: as (a) recycling farms, with a forage cultivation area (more than 0.1 ha), (b) semi-recycling farms (0.01-0.1 ha) and (c) with non-recycling farms (less than 0.01 ha). The self-sufficiency forage crops for animal feed was 44.4, 15.0, and 4.2% in recycling farms, semi-recycling farms and non-recycling, respectively. The recycling rate of compost was 98.8, 63.8, and 20.6% in recycling farms, semi-recycling farms and non-recycling farms, respectively. The annual farm-gate N surplus (input–output) per head was 42, 47, and 55 kg in recycling farms, semi-recycling farms and non-recycling, respectively. The mean annual N balance per head in recycling farms was less than 28% of non-recycling. The field nitrogen budgets showed 234, 1,161, and 5,476 kg N ha-1 year-1 in recycling farms, semi-recycling farms and non-recycling farm, respectively. N-surplus reductions of in recycling farms was 5-23 times lower compared to the semi-recycling farms and non-recycling farm. The nitrogen use efficiency (NUE) was 54, 36, and 29%, in recycling farms, semi-recycling farms, and non-recycling farm, respectively. Results showed that compost recycling through crop-livestock recycling farm is significant in the contributing to circulating N balance and to greater efficiency and productivity. The recycling organic Hanwoo farm had the low N balance and the high NUE. To reduce the N balance, we considered how to increase the amount of recycling by using self production compost. The self production forage crops was mainly considered to reduce the N balance by decreasing input of purchased feeds and increasing crop production and recycling rate of compost.
Abstract
The aim of the study was to assess whole farm nitrogen (N)-balance in organic Hanwoo farms of different recycling types. N input, output and within-farm N flows were calculated as a farm-gate balance on 12 organic Hanwoo farms. The observed farms were divided into three groups: as (a) recycling farms, with a forage cultivation area (more than 0.1 ha), (b) semi-recycling farms (0.01-0.1 ha) and (c) with non-recycling farms (less than 0.01 ha). The self-sufficiency forage crops for animal feed was 44.4, 15.0, and 4.2% in recycling farms, semi-recycling farms and non-recycling, respectively. The recycling rate of compost was 98.8, 63.8, and 20.6% in recycling farms, semi-recycling farms and non-recycling farms, respectively. The annual farm-gate N surplus (input–output) per head was 42, 47, and 55 kg in recycling farms, semi-recycling farms and non-recycling, respectively. The mean annual N balance per head in recycling farms was less than 28% of non-recycling. The field nitrogen budgets showed 234, 1,161, and 5,476 kg N ha-1 year-1 in recycling farms, semi-recycling farms and non-recycling farm, respectively. N-surplus reductions of in recycling farms was 5-23 times lower compared to the semi-recycling farms and non-recycling farm. The nitrogen use efficiency (NUE) was 54, 36, and 29%, in recycling farms, semi-recycling farms, and non-recycling farm, respectively. Results showed that compost recycling through crop-livestock recycling farm is significant in the contributing to circulating N balance and to greater efficiency and productivity. The recycling organic Hanwoo farm had the low N balance and the high NUE. To reduce the N balance, we considered how to increase the amount of recycling by using self production compost. The self production forage crops was mainly considered to reduce the N balance by decreasing input of purchased feeds and increasing crop production and recycling rate of compost.
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