Neglected mango orchards with high canopy, low yields, heavy infection by anthracnose and fruit flies were popular in Yen chau district. Low yield and erratic fruit bearing were common for the orchards. It was also difficult to take care of them. | Tạp chí Khoa học và Phát triển 2008 Tập VI Số 2 105-109 ĐẠI HỌC NÔNG NGHIỆP HÀ NỘI MOT SO KẾT QUA BƯỚC ĐẦU VÊ CAI TẠO VƯỜN XOÀI ơ BAN COC LẮC HUYỆN YÊN CHÂU Tỉnh sơn la Some initial results of improvement of neglected mango orchards in Coc Lac hamlet Yen Chau district Son La province Phạm Thị Hương Khoa Nông học Trường Đại học Nông nghiệp Hà Nội SUMMARY Neglected mango orchards with high canopy low yields heavy infection by anthracnose and fruit flies were popular in Yen chau district. Low yield and erratic fruit bearing were common for the orchards. It was also difficult to take care of them. Post-harvest pruning of these orchards in combination with application of fertilizers and pest control promoted autumn shoots growth and reduced pest infection of these shoots. All pruned trees gave profuse blossoms in next spring. Continuing to apply fertilizers and pest control on pruned trees improved fruit set and fruit weight in both cultivars Tron and Hoi finally leading to yield increase in both cultivars compared with the controls. Chelated foliar fertilizer called Pomior has proved positive effect on shoot and fruit growth. Pre-harvest bagging could improve fruit external quality due to preventing mango fruits from pest infection. When these cultural practices were applied together local people could get more effects on crop yield and fruit external quality. Keeping annual pruning will reduce canopy height for easy caring of the orchards and for a shift from extensive cultivation to more intensive one. As a result the productivity of mango production in Yen chau district is improved. Key words Tron and Hoi mango cultivars neglected orchards post-harvest pruning pre-harvest bagging. 1. ĐẶT VẤN ĐỀ Cây xoài là một trong những cây trồng chủ lực và là nguồn thu nhập đáng kể của nông hộ ở huyện Yên Châu tỉnh Sơn La. Hai giống xoài Tròn và xoài Hôi rất nổi tiếng trong cả nước về hương vị thơm ngon đã từ lâu trở thành đặc sản của vùng đất này. Các vườn xoài ở đây được trồng
