Foliar Fertilization Effect of Environmentally-Friendly Organic Agricultural Materials for Grape Cultivation

This study was conducted to investigate foliar treatment effects of organic agricultural materials for the environmentally-friendly cultivation of grape. The organic materials applied were chitosan, wood vinegar (pyroligneous acid), amino acid solution, and ginkgo leaf extract. All the organic materials were relatively strong acidic ranging lower than pH 4.6. when comparing with other organic materials, amino acid solution contained relatively high contents of selected plant nutrients, such as N, P, K, Ca, Mg, Cu, Fe, Mn, and Zn. As comparison of selected soil properties in the grape cultivating field, soil pH values were lower at the harvest stage than at the first stage of grape growing (before treating the organic materials), and electrical conductivity (EC) and soil organic matter content were higher at the harvest stage in the all plots. The concentrations of available phosphorus increased in most of the plot soils except in control plot (conventional treatment). The concentrations of exchangeable K decreased in the plot treated with ginkgo leaf extract and the control plot. The exchangeable Mg concentrations decreased in soils of all the plots. On the other hand, the concentrations of N and K in the grape leaves were higher with the treatments of chitosan and amino acid solution, P concentrations were higher with the applications of chitosan, wood vinegar and amino acid solution, and Ca and Mg concentrations were higher with chitosan and amino acid solution treatments, respectively, than with others. The yields of grape were higher, $1,581{\sim}1,583kg\;10a^{-1}$, in the control and wood vinegar treatment plots than others. Sugar contents of grape were not different among all the plots.

포도재배를 위한 친환경 유기농자재의 엽면시비 효과

친환경 포도재배를 위하여 농가에서 용이하게 구입 및 제조가 가능한 유기농자재의 효과를 조사한 결과 본 연구에 사용한 농자재의 pH는 4.6이하였고, 아미노산액은 상대적으로 높은 비료성분을 함유하였다. 포도수확기 토양의 pH는 시험초기 (농자재 처리 전)와 비교할 때 감소하였고, EC와 유기물함량은 증가하였으며, 유효인산은 대조구 (관행처리)를 제외하고 증가하였다. 치환성 K는 은행잎추출액 처리구와 대조구, 치환성 Ca는 무처리구와 아미노산용액 처리구에서 감소하였고, 치환성 Mg는 모든 농자재 처리구에서 감소하였다. 포도 잎의 질소 (N) 함량은 chitosan과 아미노산액 처리구, P는 chitosan, 목초액 및 아미노산액 처리구, K는 chitosan과 아미노산액 처리구, Ca은 chitosan 처리구, Mg 함량은 아미노산액 처리구에서 가장 높았다. 포도 수량은 목초액 처리구와 대조구에서 $1,581{\sim}1,583kg\;10^{-1}$로 가장 많았고, 당도는 무처리구를 제외하고 같은 수준을 보였다.