In this study, experiments were conducted to determine the effect of different compost teas on plant growth reponses and yield of leaf lettuce. Compost tea is a liquid extract of compost obtained by mixing compost and water for a defined period of time. The pig manure and spent mushroom compost were made by steeping compost in water. Compost tea was aerated from 24 hours and molasses and kelp were added as supplements. The four types of compost were tested growth of lettuce. EC of animal manure compost tea was higher than that of spent mushroom compost tea. Mineral nutrients were significantly higher in animal manure compost tea compared with spent mushroom compost tea. Compost tea contains nutrient and a ranges of different organisms. The beneficial fungi and actinomycetes were prominent in a spent mushroom compost tea. Compost tea from animal manure had the higher numbers of total bacteria. The actinomycetes densities were high in spent mushroom compost tea. But actinomycetes were not founded in animal manure compost tea. The growth characteristics of lettuce in animal manure compost tea were higher than those of spent mushroom compost tea. And also SPAD value in leaf was high in plot treated with animal manure compost tea. The fresh yield of lettuce in animal compost tea was higher by 181 % that of control plot. The effect of compost tea on growth of lettuce was largely attributable to mineral nutrient.

From the experiments on the effect of chitosan and wood vinegar, which are environment-friendly materials, on the growth of eggplant and leaf lettuce, the following results were obtained. 1. The effect of chitosan and wood vinegar treatment on the growth of eggplant 1) There was no difference in soil component elements before and after treatment with chitosan and wood vinegar. The total number of microorganisms tended to increase after treatment with chitosan and wood vinegar, while the number of bacteria increased among microorganisms. However, there was no consistent tendency in the number of Acinomycetes, fungi, and trichodema between treatments. 2) The growth and the yield of eggplant increased compared with the control plot in both the chitosan-treated plot and the wood vinegar-treated plot. However, there was no significant difference between the treatments. The yield of eggplant per 10a increased in chitosan- and wood vinegar-treated plots compared with the controlled plot. There was no significant difference in treatments, however, the plot treated with 800 times-diluted solution showed a higher growth. 2. The effect of chitosan and wood vinegar treatment on the growth of leaf lettuce 1) There was no difference in soil component elements before and after treatment with chitosan and wood vinegar. The number of bacteria increased among microorganisms. However, there was no consistent tendency in the number of Acinomycetes, fungi, and trichodema between treatments. 2) The growth of leaf lettuce in both chitosan-treated plot and wood vinegartreated plot increased compared with the control plot, however, there was no significant difference between the treatments. On the whole, the plot treated with greater concentration showed a higher growth.

혼합유기질비료는 대두박, 채금박, 어분, 철분, 골분 및 황토를 원료로 광합성 미생물 SA16 균주를 접종하여 pellet 상태로 제조하여 사용하였다. 1. 혼합 유기질비료 시용이 시설상추의 생육 및 토양의 생물학적 변화에 미치는 영향 화학비료 3요소와 성분량이 동량인 혼합유기빌비료 90 kg/10a 처리구는 대조구보다 주당 엽수는 2장 정도 많았고 뿌리길이도 2cm 정도 길었으며 생체중은 51% 증수되었다. 혼합유기질비료 시용량별 수확량은 45>90>135 kg/10a 순으로 많았고 처리간에 유의성이 인정되었으며 최대 수확량을 얻을 수 있는 시용량은 73kg/10a로 나타났다. 상추수확량에 대한 소득 분석결과 혼합유기질비료 90 kg/10a 처리구에서 소득이 37% 증가되었고 최대 수량을 얻을 수 있는 혼합유기질비료를 73 kg/10a를 시용하면 소득이 41%증가될 것으로 생각된다.수확 후 토양 용적밀도는 혼합유기질 비료 90 kg/10a 처리구가 1.09 g/㎤로 가장 낮았으며 혼합유기질 비료 45 kg 처리구의 용적밀도가 1.19 g/㎤로 가장 높았다. 공극율은 혼합유기질 비료 45 kg 처리구가 58.8%로 가장 좋은 것으로 나타났으며 혼합유기질 비료 45 kg 처리구가 55.0%로 가장 낮았다. 토양 염류농도는 혼합유기질 비료 45 kg/10a을 제외하면 시험전 EC 농도 1.35 dS/m에 비해 모든 처리구에서 높아졌다. 특기할 사항은 토양의 NH4-N 함량으로 화학비료를 시용한 대조구에서 43 mg/kg으로 가장 높게 나타났으며 혼합유기질 비료 시용구간에는 10 mg/kg 내외로 차이가 없었다. 혼합유기질 비료 처리에 따른 토양중 호기성세균의 분포는 혼합유기질 비료 90 및 135 kg/10a 처리구가 12.4, 및 12.8×106 CFU/g로 가장 높았으며, 생육기보다 수확기의 호기성세균의 분포가 전체적으로 낮게 나타났다. 곰팡이수의 분포는 생육기에 혼합유기질 비료 90 kg/10a 처리구가 0.74×104 CFU/g로 가장 낮은 분포를 보였으며, 수확기의 곰팡이 수는 모든 처리구에서 고른 분포를 보였다. 2. 혼합유기질 시용이 얼갈이 배추 생육 및 토양의 생물학적 변화에 미치는 영향 얼갈이 배추의 포장 시험재배에서 엽수, 엽폭, 지하부 생체중, 지상부 건물중, 그리고 지하부 건물중 등은 혼합유기질 비료 시용구가 대조구인 퇴비구와 화학비료구보다 생장량이 양호하여 수량은 퇴비구에 비해 7.6%, 화학비료구에 비해 181% 증가하였다. 혼합유기질 비료 처리에서 통계적으로 F-test에서 유의한 형질은 지상부 생체중과 지상부 건물중이었고, LSD 0.05에서는 엽폭이 유의한 차를 보였다. 광합성 미생물 Rhodobacter azotoformans의 개체수는 105개로 표시되어 있었으나 수확 후 토양 중 개체수는 1.93×104 CFU/g으로 나타나 세균의 토양 토착능력이 우수한 것으로 나타났다.

This study was conducted to investigate the effect of microbial product on microorganisms in soil and the growth of leaf lettuce. The test material were treated with chitosan, wood vinegar and EM activity liquid, and treatment concentration was 50 times solution and 100 times solution level with foliar application. The results were summarized as follows : Among foliar application of microorganisms treatments diluted by chitosan 100 times solution level was effective considering growth of leaf lettuce as compared other dilutions and control plot. Change of microorganism number in the soil for cultivation of chinese cabbages and leaf lettuce was increased with microorganism treatment plot as compared with control plot. Specially chitosan 100 times solution level showes the most significant effect.

To clarify the proper and safe duration of maturation periods for sawdust　pig manure composts, leaf lettuces were applied with pig manure composts fermented for 15, 30, 45, 60, 75 days and 1 year (control) and cultivated in a plastic house with or without additional PE film tunnel. The changes in physiochemical properties of soil and leaf lettuce growth were measured. Shorter duration of maturation periods enhanced the generation of NH₃ gas from the composts and resulted in significant decrease in seed germination, growth and yield of leaf lettuce. Under with and without PE tunnel conditions the concentration of NH₃ from compost over 3.8 and 2.1 ㎎/100g composts, respectively induced growth reduction. In proportion to the increase of maturation duration saw　dust containing pig manure exhibited decrease in C/N ratio, NH₄⁺　N, NH₄⁺/NO₃ ratio but increase in NO₃ N contents. In case of applying pig manure compost without PE film tunnel condition the minimum maturation period of pig manure composts for safe leaf growth was 60 days, while minimum 75 days of maturation was required when applied with PE film tunnel.