This experiment was conducted to investigate the changes of sugar contents and chip color during 104days storage after harvesting of five potato varieties. The potato varieties were planted on 1st april in 1999 and harvested on 10. July in 1999. NO₂⁻ contents in potato petiole tended to decrease rapidly at tuber maturing stage. K⁺ contents in potato petiole tended to in crease at 70 days ofter planting on medium maturing varieties, and at 90 days after planting on late maturing variety. Snowden variety was no desirable cultivar for processing on spring cultivation due to long growth period. Contents of solid and sugar in potatoes affected on potato chip color. Higher contents of solid in potato varieties showed low sugar contents and no change on chip color during storage.

This study was conducted to investigate the effects of natural materials such as GB₁₀, chitofarm, chaff charcoal, and chaff charcoal sap, on quality and yield of chinese cabbage. Natural materials were treated on seeds, soil, and leaves. The total plant weight, head weight, head length, head width, leaf length, leaf width, and sugar content of chinese cabbage in treatment with natural materials showed significant difference compared with control. The yield of chinese cabbage in GB₁₀ soil treatment and 1% GB10 leaf treatment was increased 53% compared with control. The total nitrogen, P₂O₅, K₂O, CaO, MgO, Na₂O, and Mn in total plant were analyzed. The chemical components were increased in total plant of chinese cabbage treated with natural materials compared with control natural materials increased the quality of chinese cabbage.

This study was carried out to investigate the effects of natural materials on quality and yield of radish. The GB10, chitofarm, chaff charcoal, and chaff charcoal sap were used as natural materials. The total plant weight, root weight, root length, and root width of radish in treatment with natural materials showed significant difference compared with control. The yield of radish in 1% of GB₁₀ treatment was increased 75% compared with control. The chemical components were increased in total plant of radish treated with natural materials compared with control. This appears that natural materials increase the quality of radish.

This study was conducted to investigate the effects of microbial fertilizers on the yield of altari radish, chemical components of plant and soil, and the microbial floras. Six microbial fertilizers, MPK+Husk+Palma, Husk+Palma, MPK+Compost, Compost, Bio livestock cattle system (BLCS) cattle dropping, and Tomi, were used in this experiment. The yield of altari radish was increased in treatments of all microbial fertilizers. The concentration of all chemical components in plant were not significantly different. Whereas the amount of P₂O₅ in soil was increased in Compost treatment, the other components were not significantly different compared with control. The total bacteria and bacilli in soil were increased in Tomi, Husk+Palma, and MPK+ Husk+Palma treatments, and actinomycete and fungi were increased in Tomi treatment.

밀의 등숙에 따른 종실의 품질과 제분특성에 대하여 검토하였다. 천립중과 용적중은 등숙이 진행됨에 따라 그리고 수분함량이 감소함에 따라 증가하였으며 출수후 40일이 성숙기로 추정되었다. 종실의 수분함량과 천립중 및 용적중은 각각 -0.877＊＊ 및 -0.761＊＊의 부의 상관이 있었으며, Pearling index와는 0.915＊＊의 정의 상관이 있었다. 제분특성과 관련된 배유는 등숙초기에도 종실의 많은 부분을 차지하고 있었으나 제분평점은 출수후 40일이 되어서야 일정수준에 도달하였다. Break-Reduction flour ratio는 품종에 따라 큰 차이가 있었으며, 특히 조광은 높은 Break-Reduction flour ratio를 보였다. 천립중과 제분율, 회분함량 및 제분평점과는 0.603＊＊, -0.958＊＊ 및 0.956＊＊의 고도의 상관이 있었다.