论文部分内容阅读
任何一个优良品种,年代种得一久,就会发生变异。因而须经常加以整理,并从原有基础上加以提高。整理的方法,苏联专家提托夫,在新疆所採用的,为在品种内,选择为数较多的单株,经室内考种,选品质优良的单株,第2年分行栽种,当年行田间选拔。第3年分系栽种。第4年混系繁殖。华北农业科学研究所所选育的密字棉33号和103号,由于栽种年份较久,纯度逐年降低。于1951年我们採用了新疆所应用过的方法,开始整理密字棉33
Any one of the fine varieties, the age of a long time, there will be mutation. Therefore, it must be collated regularly and be improved from the original basis. Sorting method, the Soviet expert Titov, used in Xinjiang, in the variety, the choice of a large number of single plants, indoor test species, selection of high quality single plant, the second year of branch planting, field line Selection. The third year of planting. 4 years mixed breeding. North China Institute of Agricultural Sciences selected Miannian 33 and 103, due to the planting of a long time, purity decreased year by year. In 1951 we adopted the method used in Xinjiang to begin the process of sorting the word cotton