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连晚制种(秋制)是杂交水稻的一种制种耕作制。秋季制种的不利因素是花期有寒流威胁,父母本插秧因受早稻熟期牵动而影响错期安排,双亲生育期偏短而带来丰产苗架难搭,而且隔离防杂条件相对较差。这些因素都影响秋制稳产、高产、优质。认真总结各地经验,秋制必须掌握以下主要环节。一、按不同地区和海拔高度确定制种安全齐穗期,实行早稻栽培与秋季制种一次性安排。根据秋制双亲开花时,气温在25～30℃的异交率高,高于35℃或低于20℃的异交率低,杂交水稻秋制田的安全期要比常规稻的安全期提前半个月左右。以福建三明地区为例,杂交水稻秋制的安全齐穗期为九月上旬末至中旬初。以海拔高度来说,在海拔600公尺以上的地区就
Even the late seed (autumn) is a hybrid rice farming system. The unfavorable factors of autumn seed production are the threat of cold flowering in flowering period, the wrong arrangement of parental transplanting seedling due to the effect of early rice maturity, the short duration of parental growth resulting in the difficulty of seedling emergence and the relatively poor isolation and hybridization prevention conditions. These factors are affecting the stable autumn, high yield, high quality. To conscientiously sum up experiences around the world, autumn must master the following major aspects. First, according to different regions and altitude to determine the safe heading date, the implementation of early rice cultivation and autumn seed arrangement. The rate of outgrowth at 25 ~ 30 ℃ is higher than that at 35 ℃ or below 20 ℃. The safety period of hybrid rice in autumn is earlier than that of conventional rice Half a month or so. Taking Fujian Sanming as an example, the safe heading date of hybrid rice autumn is from late September to early middle of early September. In altitude, in the area above 600 meters above sea level