摘要：By the financial support from the International Development Research Center (IDRC), Canada to the Faculty of Agriculture, Chiang Mai University, Chiang Mai, Thailand, production of some vegetable seeds was tested on highland and lowland in the North of Thailand. Results showed that the highland was more suitable, climatically, than the lowland for seed production of Chinese radish (Raphanus sativus L.) and leaf mustard (Brassica juncea L.) in terms of seed yields/area. In October, seed yield of Chinese radish at Mae Hae (highland, 1,000 m asl) was 3.66 t/ha while the yield at Hoay Luk (lowland, 800 m asl) was 2.1 t/ha. In November the yield on the highlands was 2.83 to 3.01 t/ha while the lowland was only 1.05 t/ha. The same potential was observed on leaf mustard.Chinese cabbage (Brassica campestris var.pekinensis L.) seed production was also tested on the highland. However, when seed production was considered economically on the highland, only Chinese radish and leaf mustard seed production was profitable, but not for Chinese cabbage.F1 hybrid seed production of tomato (Lycoperisicon esculentum M.) was tested on the low and highlands. In first year, lowland seed yields were 34.34 to 47.41 kg/ha,while in the second year the low and highlands seed yields were 64.74 and 93.36 kg/ ha,for the two varieties tested. Both the low and highlands were suitable for the seed production of F1 hybrid tomato.F1 hybrid watermelon (Citrullus lanatus) was tested on the lowland while F1 hybrid squash (Cucubita pepo) was tested on the highland. Seed yield of watermelon was 73.65 kg/ha and squash was 71 kg/ha. The lowlands and highlands were suitable for the seed production of F1 hybrid watermelon and squash, respectively.%由加拿大国际发展研究中心(IDRC)资助,泰国清迈大学农学院在泰国北部的高海拔山区和低海拔坝区进行蔬菜种子生产比较试验,结果表明山区较坝区更适合萝卜和叶用芥菜的种子生产.在10月份,Mae Hae(山区,海拔1000 m)萝卜种子产量达3.66 t/ hm2,而在坝区的Hoay Luk(海拔800 m)则为2.1 t/ hm2.11月份,山区的萝卜种子产量在2.83～3.01 t/ hm2,而坝区只有1.05 t/ hm2.叶用芥菜的情况也一样.在山区也进行了大白菜种子生产的试验.然而,在山区进行蔬菜种子生产,从经济上考虑,只有萝卜和叶用芥菜种子生产有效益,而大白菜种子生产没效益.在山区和坝区同时做了番茄杂一代种子生产试验.第1年,坝区的种子产量为34.34～47.41 kg/ hm2,第2年,对两个品种进行试验,在坝区和山区的种子产量分别为64.74和93.36 kg/ hm2.在山区和坝区均适宜番茄杂一代种子生产.在坝区和山区还分别进行了西瓜和西葫芦杂一代种子生产试验,西瓜种子产量为每公顷73.65 kg,西葫芦为71 kg.坝区和山区分别适合西瓜和西葫芦的杂一代种子生产.
