KẾT QUẢ NGHIÊN CỨU CHỌN LỌC MỘT SỐ TỔ HỢP DÂU LAI CÓ TRIỂN VỌNG TẠI THÁI BÌNH

The results of experiment in comparing some combinations of hybrid mulberry F1 are planted seeds VH18, VH19, VH22 and GQ2 in Thai Binh show that the sprouting time of four combinations of hybrid mulberry F1 is earlier than the sprouting time of control variety VH13. Among of all combinations of hybrid mulberry F1, the combination of hybrid mulberry VH18 sprouts earlier than the control variety VH13 about 8 days. The sizes of mulberry leaves of the hybrid mulberry combinations VH19 and GQ2 are bigest. Comparing with the control variety VH13, the sizes of leaves are longer in length about 18% and wider in width about 10%-9%. The next combination VH18 has mulberry leaves that are biger in length and width than the ones of the control variety VH13 about 10%-6%. The numbers of leaves per 1 meter in length of branch of combination VH18 are 30.8, many more than the numbers of leaves per 1 meter branch of the control variety VH13 about 8%. The combination GQ2 has the numbers of leaves per 1meter branch many more than the control variety VH13 about 6%. In the second year after plating, the average yield of leaves per 1 hectare of combination GQ2 is 25.94 ton, of combination VH18 is 25.58 ton. These yield are higher than yield of leaves of the control variety VH13 about 14%-13%. The quality of leaves of the combinations VH18 and GQ2 is not better than the quality of leaves of the control variety VH13.