关键词: 免耕栽培, 免耕栽培, 施肥方法, 烤烟, 产量, 质量

Abstract: The objective was to study the growth and development rules of different varieties of pigeons. The growth curve of European pigeons, white Carnean pigeon and white king pigeon from 0 to 4 weeks old was analyzed and fitted with five kinds of nonlinear models (Gompertz, Logistic, von Bertalanffy, MMF(Morgan-Mercer-Flodin) and Weibull). The results showed that there was no significant difference in body weight between the two pigeon breeds except the four-week-old pigeons, which were significantly lower than the European pigeons. The overall line of growth and development showed a consistent trend. Absolute yield of European pigeons was significantly higher than that of Carnean pigeon and white king pigeon, and the relative growth rate curves were basically in overlapping. The result shows that five models were well fitted for the growth curves with more than 0.9 degree of fitting, but the optimum fitting curve for the pigeons was Weibull with R2 was 1.000, and the optimum fitting curve for white card pigeon was MMF with R2 was 0.999. A fixed point of growth model has certain limitation, flexible inflection point of growth model has better applicability, Four-parameter growth curves is better than three-parameter growth curves, it is recommended to use four parameters growth curves with flexible inflection point to fit the pigeon growth curve. Inflection point data showed that the first week was the critical period of pigeon growth, so we need to strengthen feeding and management of the pigeon during this period.