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Effects of Liquid Pig Manure Application Level on Growth Characteristics, Yield, and Feed Value of Whole Crop Barley at Reclaimed Tidal Land in Southwestern Korea

  • Received : 2014.10.30
  • Accepted : 2014.12.15
  • Published : 2014.12.31

Abstract

This study was conducted to investigate liquid pig manure (LPM) application rates on the growth characteristics, yield, and feed value of whole crop barley in Yeongsangang and Saemangeum reclaimed tidal land. Electronic conductivity (EC), organic matter (OM), and available phosphate (Av. $P_2O_5$) increased in chemical properties of Yeongsangang and Saemangeum soil as raising LPM application level. As increasing LPM application level, exchangeable $Na^+$ significantly increased in Yeongsangang, while exchangeable $K^+$ significantly increased in Saemangeum. Plant height was not significantly different from LPM 100% to LPM 200% in Yeongsangang and in Saemangeum. Dry matter yield of whole crop barley increased steadily, but crop yield of LPM 200% in Yeongsangang ($10.5ton\;ha^{-1}$) was as much as that of LPM 150% ($10.0ton\;ha^{-1}$). Yield of LPM 200% ($11.2ton\;ha^{-1}$) in Saemangeum was similar to that of LPM 150% ($10.5ton\;ha^{-1}$). Crude protein (CP) increased depending on LPM application level, but total digestible nutrients (TDN) increased regardless of LPM application level. LPM 200% was the highest in TDN yield (Yeongsangang: $7.4ton\;ha^{-1}$, Saemangeum: $6.9ton\;ha^{-1}$), but there was no statistical difference between LPM 150% (Yeongsangang: $6.9ton\;ha^{-1}$, Saemangeum: $6.6ton\;ha^{-1}$) and LPM 200%. From the results described above, optimum rate of LPM for cultivating whole crop barley is considered 100% in Yeongsangang reclaimed tidal land and 150% in Saemangeum reclaimed tidal land, showing that the effect of LPM application is better in Segmentation than that in Yeongsangang for yield of whole crop barley.

본 연구는 영산강간척지와 새만금간척지에서 청보리 재배시 돈분뇨액비 적정 시용수준을 구명하기 위해 전남 해남군 소재 농가포장과 벼맥류부 계화간척지에서 처리구를 무시용, 액비 50%, 100%, 150%, 200%로 두고 토양 화학성, 생육, 수량, 식물체 양분흡수 및 사료가치를 조사하였다. 돈분뇨액비의 시용수준이 증가할수록 pH는 변화가 없었으나 토양유기물 및 유효인산의 함량이 증가하였고 치환성 양이온은 영산강간척지에서 $Na^+$가, 새만금간척지에서는 $K^+$가 크게 증가하였다. 영산강간척지에서 청보리의 초장은 돈분뇨액비 100%, 150%, 200%에서 각각 102 cm에서 103 cm로 큰 차이가 없었고 새만금간척지의 청보리 초장 또한 각각 100 cm에서 103 cm로 큰 차이가 없었다. 하지만 $m^2$당 경수의 영향으로 인해 영산강간척지에서 청보리 생체수량이 $27.5ton\;ha^{-1}$에서 $32.6ton\;ha^{-1}$로 증가하였고 새만금간척지에서 $9.7ton\;ha^{-1}$에서 $11.2ton\;ha^{-1}$으로 증가하였다. 영산강간척지에서 건물수량은 각각 $10.0ton\;ha^{-1}$, $10.5ton\;ha^{-1}$이었고 새만금간척지에서 돈분뇨액비 150%시용과 200% 시용의 건물수량은 각각 $10.5ton\;ha^{-1}$, $11.2ton\;ha^{-1}$이어서 통계적으로 차이가 없었다. 식물체 분석에서는 액비 시용수준이 증가할수록 T-N, T-P, $K^+$, $Na^+$의 함량이 증가하였다. 사료가치 분석에서 조단백질은 영산강간척지에서 4.9%에서 6.7%로, 새만금간척지에서 4.7에서 7.7%로 액비 시용수준이 증가할수록 증가하였다. TDN 함량은 액비 시용수준에 따른 경향을 찾을 수 없었지만 TDN수량은 영산강간척지에서 $2.1ton\;ha^{-1}$에서 $7.4ton\;ha^{-1}$로, 새만금간척지에서 $2.0ton\;ha^{-1}$에서 $6.9ton\;ha^{-1}$로 액비 시용수준이 증가할수록 TDN 수량이 증가하였다. 두 간척지에서 청보리의 수량을 고려했을 때 돈분뇨액비 시용시 영산강간척지는 청보리 질소 표준시비량의 100%, 새만금간척지는 150% 수준을 2번 나누어 시용하는 것이 바람직하다고 판단된다.

Keywords

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