동계녹비작물의 활용은 친환경농업을 위한 유용한 방법중의 하나이다. 고추 수량, 질소흡수, 탄수화물 합성 및 토양 질소공급에 대한 두과(헤어리베치) 및 화본과(호밀) 녹비작물의 효과를 조사하였다. 녹비작물로부터 무기화된 질소는 토양환원 후 30일경에 최대치에 도달하였으며, 무기태 질소의 양은 $645mg\;kg^{-1}$ (헤어리베치) 및 $237mg\;kg^{-1}$ (호밀) 이었다. 토양 환원된 헤어리베치로부터 무기화된 질소의 양은 화학질소 ($365mg\;kg^{-1}$)보다 높았는데 이는 헤어리베치의 투입량이 질소기준으로 약 2배였기 때문인 것으로 판단된다. 광합성량과 탄수화물 합성은 정식 후 70일까지 처리간에 큰 차이를 보이지 않았지만, 생육후기 호밀처리구의 고추 광합성량과 탄수화물 합성량(전분)이 다소 감소하는 경향을 보였다. 두과녹비작물인 헤어리베치가 호밀에 비해 고추의 생육 및 수량에 큰 영향을 미치는 것으로 나타나, 향후 고추재배시 헤어리베치의 화학비료 대체효과는 클 것으로 사료된다.
동계녹비작물의 활용은 친환경농업을 위한 유용한 방법중의 하나이다. 고추 수량, 질소흡수, 탄수화물 합성 및 토양 질소공급에 대한 두과(헤어리베치) 및 화본과(호밀) 녹비작물의 효과를 조사하였다. 녹비작물로부터 무기화된 질소는 토양환원 후 30일경에 최대치에 도달하였으며, 무기태 질소의 양은 $645mg\;kg^{-1}$ (헤어리베치) 및 $237mg\;kg^{-1}$ (호밀) 이었다. 토양 환원된 헤어리베치로부터 무기화된 질소의 양은 화학질소 ($365mg\;kg^{-1}$)보다 높았는데 이는 헤어리베치의 투입량이 질소기준으로 약 2배였기 때문인 것으로 판단된다. 광합성량과 탄수화물 합성은 정식 후 70일까지 처리간에 큰 차이를 보이지 않았지만, 생육후기 호밀처리구의 고추 광합성량과 탄수화물 합성량(전분)이 다소 감소하는 경향을 보였다. 두과녹비작물인 헤어리베치가 호밀에 비해 고추의 생육 및 수량에 큰 영향을 미치는 것으로 나타나, 향후 고추재배시 헤어리베치의 화학비료 대체효과는 클 것으로 사료된다.
Winter annual green manure crops may be an effective tool for environmental-friendly agriculture system. The effect of legume (hairy vetch), non-legume (rye) and N fertilization ($190kg\;N\;ha^{-1}$) was examined and compared on red-pepper yield, nitrogen uptake, carbohydrate composition,...
Winter annual green manure crops may be an effective tool for environmental-friendly agriculture system. The effect of legume (hairy vetch), non-legume (rye) and N fertilization ($190kg\;N\;ha^{-1}$) was examined and compared on red-pepper yield, nitrogen uptake, carbohydrate composition, and soil N and C contents. We monitored soil N and C for 120 days after incorporation (DAI) of green manures or mineral fertilizer. The mineralization of nitrogen reached the maximum around 30 DAI. The amount of inorganic nitrogen supplied by mineralization of hairy vetch residue was greater with than chemical N or rye. Photosynthetic rate was similar by 70 DAT in all treatments however, it in rye-incorporated red-pepper presented a sharp decline at later growth period. Leaf total nitrogen was greater with hairy vetch and chemical N than rye throughout the experiment. The soluble sugar increased steadily in all treatments from 40 to 110 days after transplanting (DAT) whereas starch showed a tendency of great decrease. Hairy vetch greatly promoted red-pepper growth by the later period however, chemical N showed the highest fruit yields.
Winter annual green manure crops may be an effective tool for environmental-friendly agriculture system. The effect of legume (hairy vetch), non-legume (rye) and N fertilization ($190kg\;N\;ha^{-1}$) was examined and compared on red-pepper yield, nitrogen uptake, carbohydrate composition, and soil N and C contents. We monitored soil N and C for 120 days after incorporation (DAI) of green manures or mineral fertilizer. The mineralization of nitrogen reached the maximum around 30 DAI. The amount of inorganic nitrogen supplied by mineralization of hairy vetch residue was greater with than chemical N or rye. Photosynthetic rate was similar by 70 DAT in all treatments however, it in rye-incorporated red-pepper presented a sharp decline at later growth period. Leaf total nitrogen was greater with hairy vetch and chemical N than rye throughout the experiment. The soluble sugar increased steadily in all treatments from 40 to 110 days after transplanting (DAT) whereas starch showed a tendency of great decrease. Hairy vetch greatly promoted red-pepper growth by the later period however, chemical N showed the highest fruit yields.
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가설 설정
, 2004). As monitoring the changes in inorganic nitrogen, which showed the decrease after around 30 DAI, in all treatments, it was considered that additional N sources should be supplied for crop growth and yield. Soil total nitrogen and organic matter by incorporating green manure crops were profoundly enhanced.
제안 방법
Exchangeable cations were extracted with 1N-NHQAc and measured by ICP (GBC, Austrailia). In order to monitor temporal changes in soil nitrogen and organic matter in red-pepper-growing field incorporated with different N sources, six random soils were drawn from the horizon (10-20 cm) of each plot using auger during 120 days after treatment. Soil inorganic nitrogen, NH4 (Kopp & McKee, 1978) and NO3 (Keeney & Nelson, 1982), concentrations in the fresh soil were determined by flow injection analyzer after the extraction with 2 M KCl.
데이터처리
Data analysis All data were subjected to an analysis of variance and when significance (P < 0.05, 0.01, 0.001) occurred for the effect of treatment, a least significant difference (LSD) was calculated using SAS 9.0.
성능/효과
The effects of hairy vetch and chemical fertilizer on crop growth, photosynthesis, carbohydrate composition and fruit yields were similar whereas rye resulted in poor crop growth, carbohydrate synthesis and fruit yield. On the basis of this study, it was demonstrated that hairy vetch was better green manure crops for the supply of nitrogen and growth of the succeeding crop.
However, a decrease in nitrogen availability resulted in a sharp decline of photosynthetic rate in rye treatment at 110 DAT. The stomatal conductance was not found in differences among treatments throughout the experiment, and the evaporation rate was significant at 70 DAT (p < 0.01) and 110 DAT (p < 0.05) among treatments. Total nitrogen of leaf presented the similar pattern between NPK and hairy vetch however, it in rye treatment was much lower compared with other treatments (Fig.
Thereafter, yield of red-pepper in rye treatment was considerable reduced (Table 3). Total- and marketable fruit yields were significantly higher with NPK than hairy vetch and rye (Table 3), and those between green manure crops were greater in hairy vetch. As mentioned above, the supply of abundant nitrogen from hairy vetch did not showed positive effect on crop yield.
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