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所谓良种繁育,就是要求运用一系列的技术手段,保持和稳定一个品种的特性,迅速扩大其应用范围,并且能够相应延长品种种植年限,提高品种的使用价值。严格地说,良种繁育是一个种子质量的控制系统,它的主要任务有两个:一是迅速繁殖新品种种子;二是保持品种的纯度和种性。目前,在棉花原种的繁育方法上,应用较多的有以下几种模式。 1 传统的三年三圃制:使用该方法较多的是县及县以下的原种场、农科所等。它的一般程序是,选择优良单株进行株行比较鉴定;选择优良株行进行株系比较试验;优系混合生产原种,这种方法强调优中选优,以量取胜。由于初选单株较多。需测定两年后代,工作量大。在条件不具备的一
The so-called breeding, is to require the use of a series of technical means to maintain and stabilize the characteristics of a variety of products, and rapidly expand its scope of application, and can extend the variety of planting years, improve the use of varieties. Strictly speaking, breeding is a seed quality control system, its main task has two: First, the rapid breeding of new varieties of seeds; the second is to maintain the purity and species variety. At present, the breeding methods of cotton seed, the more used in the following modes. A traditional three-year three-nu system: the use of this method is more than the county and county of the original species farms, agricultural science and so on. Its general procedure is to select good plants for identification and comparison; to choose good lines to conduct comparative tests of lines; to produce hybrids of superior quality, which emphasizes the selection of the best and the best, and the quantity to win. Due to the primacy of more plants. Need to measure two years later, heavy workload. One that does not have the condition