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The research was done to observe open-field cultivation potential for growing melons Cucumis melo L. without covering in two regions of Latvia: Tukums and Cesis. Three varieties of melons 'Zolotistaya', 'Galiley' and 'Kolkhoznica' were used. In all, 15 individuals of each variety were grown at each place - Tukums region and Cesis region. To evaluate growth and development intensity for each variety in each region, the following parameters were measured parameters were measured: length of the main shoot, number of leaves per plant, time of appearance of the first male and female blossom, and number of perished plants. The most suitable variety for the Cesis region was found variety 'Kolhoznica', but for Tukums region - 'Zolotistaya'. The research suggests that variety 'Galiley'is the least suitable for growing in both regions. It was established that successful open-field cultivation of melons in Tukums and Cesis regions is possible only in case of favourable weather conditions. In the year of the investigation, 2004, insufficient sum of effective temperatures limited successful development and yielding of melon.

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