论文部分内容阅读
在我国北方地区,干旱历来是农业生产的主要威胁。我国劳动人民在长期与干旱作斗争中,积累了相当丰富的经验。而抗旱播种保全苗在全年抗旱斗争中是第一个有决定
In northern China, drought has historically been a major threat to agricultural production. The working people in our country have accumulated considerable experience in the fight against drought for a long time. Drought seedlings planted seedlings in the fight against drought throughout the year is the first decision