我们于1980—1982年在射洪县平安公社建设大队四、五队各选棉田一块(不同地势和土质),用抗病棉73—27作材料,进行棉花模式株调查。每年在各棉田选择正常棉株10株,绘制图形,按时观察记载,各生育期所需天数,或脱落及黑烂铃日期,根据最后开花阶段所结的铃数及其铃重,确定有效开花期。收获期间,按模式株各果枝、果节成铃单收或混收,进 In 1980-1982, we set up a team of four or five teams in Ping’an Commune of Shehong County (different topography and soil quality) to carry out the investigation of the cotton model plant with disease-resistant cotton 73-27. Select 10 normal cotton plants in each cotton field each year, draw a graph, observe the records on time, the number of days required for each growth period, or fall and black rotten bell date, according to the number of bolls and boll weight at the final flowering stage to determine the effective flowering period. Harvest period, according to the model strains of fruiting branches, fruit section bells single income or mixed, into