六、调整花期,确保相遇。在玉米生长过程中,掌握两亲本的生长动态,判断是否能够花期相遇,是田间管理的一项重要内容。预测花期的方法很多,最常用的是叶片检查法。具体做法是:在一般情况下,父本的未出叶比母本的未出叶多1～2片时,被视为两亲花期可能相遇。在确知制种亲本在当地 Six, adjust the flowering, to ensure that meet. In the process of corn growth, grasping the growth dynamics of the two parents and judging whether they can meet in flowering stage are important contents of field management. There are many ways to predict the flowering period, the most commonly used is the leaf check method. The specific approach is: Under normal circumstances, the father of the non-leaves more than the mother of the leaves out more than 1 or 2, is considered likely to encounter the flowering of the two parents. In determining the seed production in the local