Studies on the Rotation Crop of Leafy Vegetables

• Main Authors: Yen-Yu Chen, 陳彥宇
• Other Authors: 李文汕 博士
• Format: Others
• Language: zh-TW
• Published: 2010
• Online Access: http://ndltd.ncl.edu.tw/handle/23744005594396228983

碩士 === 國立中興大學 === 園藝學系所 === 98 === Abstract Leafy vegetable are crops of high cropping index, hence the how to manage rotation crop system is the major factor in leafy vegetable production. Experiments were couducted to study the vegetative growth of chinese kale, lettuce, spinach, Pak-cho and water spinach as affected by repeat planting or by rotation with different previous leafy vegetables crops. Soil pH value was significantly affected by different leafy vegetables where soil pH value decreased by repeat planting of edible amaranth yet increased by repeat planting of pak-cho. It was found that the ammonium nitrogen, potassium and calcium contents in soil were the lowest while the nitrate content was the highest among all treatments after repeat planting of edible amaranth. In contrast, continuous cultivation of cruciferous leafy vegetables resulted in lower nitrate contents. As to EC value of soil, under the similar fertilization managements, lower EC value was observed in the soil after the cultivation of lettuce and edible amaranth than those of cruciferous leafy vegetables. It is postulated that cruciferous leafy vegetables are of higher fertilizer requirement than other crops. Field seed emergence rates of leafy vegetables were under the influence of repeat planting and rotation among different crops. The field emergence rates of spinach, edible amaranth and water spinach decreased significantly after repeat planting for there times. The seed emergence of spinach, water spinach and edible amaranth were inhibited in the soil after two continuous crops of leafy kale. Similar phenomenon were also observed on pak-cho, leafy kale, water spinach and edible amaranth after the repeat planting of spinach, and on kale, lettuce and pak-cho after the repeat planting of edible amaranth. Continuous cultivation of water spinach inhibited the seed emergence of lettuce and edible amaranth. Water leaching solusion from the above ground parts of edible amaranth and water spinach were found containing total phenolic compounds of 120 ppm and 109 ppm, respectively. Inhibition effects over the seed germination by the leaching solusion were observed on different leafy vegetables. The vegetative growth of lettuce as affected by different previous leafy vegetables and they didn''t affect subsequent leafy vegetables. The Pak -chore peat replant cause the serious insect for phyllotreta striolata, and decrease the vegetative growth of Chinese kale. The vegetative growth of spinach and edible amaranth were inhibited in the soil after two continuous crops of water spinach. Continuous cultivation of edible amaranth inhibited the vegetative growth of leafy kale and lettuce spinach and the seedling of edible amaranth., In conclusion, The growth of leafy vegetable was under the influence by rotation or monoculture. We obtained the vegetative growth of lettuce as affected by different previous leafy vegetables and they didn''t affect subsequent leafy vegetables. They were recommended to rotation with other leafy vegetable. Growth of leafy vegetables were under the influence of repeat planting by spinach, edible amaranth and water spinach. In the contrast, the growth of leafy vegetables has different influence by subsequent crops. Consider of the crop rotation be important for leafy production.