The object of this study was to simulate the formation of cotton seed oil by allometry growth relationship between the change of cottonseed oil content and the biomass accumulation. A set of field experiments were conducted in the lower reaches of Yangtze River Valley （ Nanjing, Huaian） and the Yellow River Valley （ Xuzhou, Anyang） in 2005, where Kemian 1 and NuCOTN 33 B were selected, two sowing dates and three N fertilizer application rates were conducted. According to the data collected in Nanjing, a simulation model of cotton seed oil content was developed based on allometry method, and the response of cotton seed oil content to meteorological factors were quantified. The parameters in the model were calibrated using the field data obtained in Nanjing. The model was tested using an independent field data obtained in Huaian, Xuzhou and Anyang. The results showed that the model was sufficiently robust to accurately predict cottonseed oil content with the RMSEs of 2.2% ,2.9% ,and 2.4% respectively. It proved the feasibility that using allometry growth equation to accurately simulate cotton seed oil content.
Cotton （ Gossypium hirsutum L）