Korean Journal of Soil Science and Fertilizer (한국토양비료학회지)

Korean Society of Soil Science and Fertilizer (한국토양비료학회)
권호 표지

Effects of Green Manure Crops on Improvement of Chemical and Biological Properties in Soil

토양 화학성 및 생물학성 변화에 대한 녹비작물 시용 효과

  • Received : 2010.08.31
  • Accepted : 2010.10.22
  • Published : 2010.10.30
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Abstract

We used green manure crops such as hairy vetch, crimson clover, rye, sorghum, and sudan grass by mixing with soils to assess the effects of green manure crops on nutrient supply and soil quality improvement. Temporal changes in soil inorganic nitrogen, carbohydrate, microbial biomass, and humus content were determined as soil quality indicators. Inorganic nitrogen content of the control maintained similar level during the whole period, but it had continually increased until 4 weeks after incorporation (WAI) of green manure crops. Especially, inorganic nitrogen content sharply increased in sudan grass. After incorporation of green manure crops, temporal change of soluble sugar in soils was as follows: it had gradually increased in legume green manure crops-incorporated soils until 7 WAI, which was the highest, and then showed the tendency to be reduced. Meanwhile, it in non-legume green manure crops-incorporated soils rapidly increased after the incorporation, and reached the maximum around 4 WAI. Humic acid by the decomposition of crop residues in green manure crops-incorporated soils was greatly enhanced with the elapsed time of 4 WAI, although it was low at the same level as the control until 2 weeks. In addition, there was a difference in fulvic acid by incorporated crops, fulvic acid in hairy vetch, sorghum and sudan grass showed a similar tendency with the change in humic acid. Our results suggest that soluble sugar, microbial activity and humic acid could be available indicators to evaluate the fertility of green manure crops-incorporated soils.

시설재배지의 경우 휴작기간 동안 녹비작물의 활용가능성이 높을 것으로 판단된다. 본 연구는 녹비작물이 시설재배지에서의 양분공급 및 토양질 개선에 미치는 영향을 평가하고자 두과 (헤어리베치, 크림손클로버) 및 화본과 (호밀, 수수, 수단그라스) 녹비작물을 재배 후 토양과 혼합하였으며, 무기질소 공급능과 생물적 지표로써 토양 탄수화물, 미생물활성 및 부식함량의 경시적 변화를 측정하였다. 관행구의 무기태 질소함량은 전 기간 비슷한 수준을 유지하였으나 녹비작물을 처리한 토양에서는 토양처리 후 4주까지 무기태질소 함량이 지속적으로 증가하였고, 특히 수단그라스에서 무기태질소 함량이 두드러지게 증가하였다. 녹비작물 처리 후 토양 중 수용성 당은 두과 녹비작물 처리 후 서서히 증가하기 시작하여 7주 경에 가장 높았으며 이후 서서히 감소하는 경향이 나타났다. 반면 화본과 녹비작물 처리 후 수용성 당이 빠르게 증가하여 처리 후 4주 경에 최대치에 도달한 후 감소하는 양상이 나타났다. 토양 내의 부식산 (humicacid)은 아무것도 첨가하지 않은 관행구와 녹비처리 초기에는 비슷한 수준으로 낮았으나 녹비처리 후 4주 정도 시간이 경과하면서 녹비작물의 부숙에 의해 형성된 부식산이 점점 증가하는 것을 확인할 수 있었다. 또한 양이온과 결합하여 물에 잘 용해되는 염을 만드는 fulvic 산에서도 작물 간 차이는 있었지만 부식산의 함량 변화와 비슷한 경향이었다.

Keywords

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