Cultivated land quality was assessed by BP neural network in Dazu County, Chongqing. The assessment results showed that paddy lands were mainly of the second-grade and third-grade, while dry lands were mainly of the first-grade and second-grade. It illustrated the high natural quality of the cultivated land, but the natural quality only reflected land natural characteristics. Therefore, influence coefficient was used to modify natural quality index based on the investigation to households. At the same time, by using the household income as the value of cultivated land, the impact of natural quality and investment structure on the value were further discussed. The results showed that trinomial equation and binomial equation were fitted to reflect the relationship between natural quality and income.

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According to the 13-Article Code and the 16-Article Code which had been enforced for several hundred years in old Tibet, Tibetans were divided into three classes and nine grades. The lives of ironsmiths, butchers and women, who were declared an inferior grade of inferior class in explicit terms, were as cheap and worthless as a straw rope.

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