抗寒育种是防寒和抗寒的最根本的途径。长期以来,育种家们培育出了不少抗寒新品种,对避免和减小寒害损失起了重要作用。一、杂交育种杂交育种是育种工作中迄今为止采用最普遍最有效的方法,也是培育抗寒新品种的有效方法,例如在法国,玉米原来只能在南部和西南部种植,通过杂交育种培育出了耐寒、早熟、高产的新品种,使玉米栽培扩大到北部和西北部,种植 Cold breeding is the most fundamental way to prevent cold and cold. For a long time, breeders have cultivated many new cold-resistant varieties, and played an important role in avoiding and reducing the loss of cold damage. First, hybrid breeding Cross breeding is by far the most common and effective breeding methods, and is also an effective way to cultivate new varieties of cold, for example, in France, the original corn can only be planted in the south and southwest, through breeding breeding Cold-resistant, precocious, high-yielding new varieties of corn to expand to the north and northwest, planting