... and Bacgiang provinces, the percentage of farmers using animals for preparing land was about 67-100%. On the other hand, the percentage of farmers using machines for preparing their land was ... Quangtri, mainly as a winter crop in Thanhhoa and as a winter and spring crop in Bacgiang. • Farmers in all investigated localities needed new, high yielding varieties with good quality, and an accompanying ... cultivated as the winter-spring crop. On the other hand, in Thanhhoa and Bacgiang provinces, sweet potato was largely cultivated as the winter and spring crops, respectively. • Farmers in all investigated...