(IPPM) in Vegetables - Vegetableipmasia.org

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Resource Manual on IPPM in Vegetable World Education Philippines, Inc. e. Preparation of Bed There are two common types of beds used for pak-choi production. the raised bed and the flat bed. Raised beds are used during wet season planting to prevent flooding in case of heavy rains. The bed is raised about 30 cm in height with 1.0 m width. Weeding in this type of bed is much easier. When direct seeded, the bed should be well pulverized in order not to hamper the germination of the very tiny seeds of the crop. If transplanted, the big clods should be reduced into smaller sizes. f. Transplanting Transplant pack-choi seedlings at 10 14 days after emergence. It is important to harden off the plants prior to planting to minimize transplant shock that can cause premature bolting (seed head formation). g. Fertilization The amount of NPK to be applied is determined through proper soil analysis, usually through the use of soil test kit. Among the major elements required by pak-choi, nitrogen is the highest enough to say that it is a voracious eater of nitrogen. The amount of application ranged from 70 120 kg per hectare depending on the inherent N fertility of the areas. Compost, P and K fertilizers are applied at the same time. N containing fertilizers, because of their solubility in water are applied in several doses. Below is the schedule of fertilizer application for direct seeded and transplanted pak-choi. Table 14. Fertilization Schedule for Direct Seeded and Transplanted Pak-choi. Methods of Planting Schedule of Application Amount (kg/ha) Direct seeded Pre-planting or last harrowing All P and K and 1/3 of N All the require compost Transplanted h. Irrigation At 2 weeks after emergence At 3 weeks after emergence Pre-planting or last harrowing At 2 weeks after transplanting 1/3 of N 1/3 of N All P and K and 1/3 of N All the required compost 2/3 of N Frequent irrigation is recommended to encourage brisk growth. Pak-choi should receive at least 1 inch of water weekly (irrigation or rainfall) for optimum yield and quality. Irrigation should be applied early in the day to allow plants time to dry before evening. This also facilitates lower field temperatures during the day, which is an additional benefit during warmer days of midsummer. 74
Resource Manual on IPPM in Vegetable World Education Philippines, Inc. i. Insect Pest and Diseases Insect which can cause damage to pak-choi include aphids, flea beetles and diamondback moth larvae. Flea beetles and DBM are the most common and can easily render a crop unfit for sale. The common disease problems in pak-choi are damping-off (Phytium sp.), soft rot (Erwinia caratovora) and leaf spot (Alternaria brassicae). Diseases are most prevalent when there is excessive soil moisture. j. Weeding Use of handweeding is the most effective means of controlling weeds in pak-choi fields. k. Harvesting Pak-choi can be harvested at 25 30 days after sowing or 15 20 days after transplanting. It is not advisable to harvest in the hottest part of the day because the plant can wilt quickly. To harvest cut entire plant off at ground level, then remove any damaged leaves and trim root base. Pack loosely into boxes to allow adequate air circulation. 75
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ACKNOWLEDGM ENT World Education (IN
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1. Leaves 48 2. Flower 49 3. Fruit
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Sources 203 Part XII: Farm Record K
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