LỰA CHỌN GIỐNG VÀ THỜI VỤ TRỒNG CẢI BẮP AN TOÀN TRÁI VỤ CHO XÃ VÙNG CAO VÂN SƠN, HUYỆN TÂN LẠC, TỈNH HÒA BÌNH

Off-season cabbage production means growing cabbage during the summer months in Northern Vietnam. Therefore, this study aimed to select suitable off-season cabbage varieties and off-season planting date to take advantage of the favorable highland climate. A two-factor experiment was arranged in a split-plot design with main plot as three off-season planting date (March 25, 2023 (season 1), April 14, 2023 (season 2), May 7, 2023 (Season 3)), while subplots were three cabbage varieties Grand KKcross, Green Helmet and HMT34 with three replications. The results showed that both seasons 1 and 2 were suitable for the cabbage growth, physiology, yield and quality, with an actual yields of 22.48 tons ha-1 and 21.54 tons ha-1, respectively. Among the tested varieties, Grand KK cross cabbage was the most suitable for off-season cabbage production with the highest average head weight and actual yield (23.06 tons ha-1). The combination of Season 1 or 2 with the Grand KK cross proved the most optimal for the highland commune Van Son, as evidenced by superior growth characteristics, physiological performance, yield, and quality compared to other combinations, achieving actual yields of 26.67 tons ha-1 and 24.57 tons ha-1, respectively.