杂交水稻制种中父母本花期相遇与否,是制种成败的关键。要使父母本花期相遇,就要根据亲本在当地气候条件下,各造的生育期及叶片数资料,准确地推算播种错期。但影响亲本生育期的因素非常复杂。在制种中,常见到同样的组合、播种期、播种错期和气候条件,有的花期相遇好,有的相遇不理想。据调查,育秧技术不同,致使秧苗素质(分蘖数)有异。插植基本苗数多少是否影响生育期?我们做了两个试验,旨在探讨插植基本苗数对生育期的影响规律。一、试验材料和方法 Hybrid rice seed production in the parents of flowering or not, is the key to the success of seed production. In order to meet the parents of the flowering season, it is necessary to accurately estimate the planting error period based on the information of the growth period and the number of leaves of the parents under the local climatic conditions. However, the factors affecting the parental growth period are very complicated. In the seed production, common to the same combination, sowing, sowing the wrong period and climatic conditions, and some flowering met, and some meet less than ideal. According to the survey, different seedling raising techniques, resulting in seedling quality (tillering number) vary. How many planting seedlings affect the growth period? We have done two experiments to explore the planting seedling number of the growth period of the law. First, the test materials and methods