What methods were used to treat cold-soaked fields in Qing Dynasty?

According to the records of Shunning County in Qing Dynasty, the local method to deal with cold-soaked fields is that "farmers should pile pears like kiln towers, hollow them out and insert firewood to make a fire. The soil was burnt and the water was transferred. The soil is greasy and the gas is Su Chang, so seeds can be planted. If the pears are not full or out of season, the seedlings should not ask. "

Deep ploughing and freezing is a kind of leisure field in winter. Deep ploughing should be carried out in autumn and winter to promote loose and mature soil. After thawing in spring, plough and harrow to conserve moisture, and furrow to build the border. When planting in summer, choose the stubble of early-maturing crops to rush to plant.

In addition, the records of Changning County, Yongzhou Prefecture and Xingning County in Qing Dynasty also recorded the methods of improving cold-dipped fields with lime.