生育期間的追肥是促进水稻群体合理发展、提高产量的一項重要措施。但具体运用时必須根据苗情,“看天、看地、看苗”适时、适量追施,方能取得預期效果。否則常易招致倒伏、貪青、罹病从而使产量降低。我国农民在这方面累积了丰富的宝貴經驗,如陈永康的看叶色(三黄三黑)、长势(株型、“平头叶、枪头叶”) Top dressing during birth is an important measure to promote the rational development of rice populations and increase the yield. However, the specific application must be based on the Miao situation, “see the sky, look at, see Miao” timely, appropriate top-dressing, can achieve the desired results. Otherwise often lead to lodging, greed green, sick so as to reduce production. Our peasants have accumulated a wealth of valuable experience in this field. For example, Chen Yongkang’s view of Yehsan (three yellow and three blacks), its growth (plant type, “flat head leaves and head leaves”),