【摘要】 棉花主茎倒四叶宽度是看苗诊断的一项重要指标。本文应用沿江棉区海门县１９８３～１９９１年盐棉４８等５日定点生育调查资料，分析阑述了麦垄套栽、麦后移栽、地膜覆盖、露地直播４种茬口棉花的主茎倒四叶宽增长变化规律及其不同点，提出了不同茬口中熟陆地棉不同生育期的倒四叶宽诊断指标更多还原

【Abstract】 The width of the inverse fourth leaf of cotton plant is used as an index to give thenutrition diagnosis. Plant development data obtained by 5 day interval investigation of 1983～1991 in Haimen county of Yanjiang cotton growing area was analysed on Yanmian 48 forthe growing regulation of inverse fourth leaf width planted by intercropping with wheat,ortransplanted after wheat harvest,or mulched with plastic film or sowed directly.Diagnosis in-dex for the nutrition at different developing stages of the early mid maturity upland cottonunder different planting pattern was raised.更多还原