In recent years, the research on laozi in "the moral youdao, but all in all, dung, military in rural" [7]. Its basic meaning should be "world too, the horses for the field; and when the war, the horses are to play", also reflects 475-221 BC, namely, the moral was already known to people using animal feces fields, and the development of agricultural production and the cultivation of interest-bearing truth.
Writing in the warring states period, the connections that "the earth", is the soil and fertilizer use transformation to become fertile soil, including thin by a ", is "the dung of cattle dung to improve using soil fertility, such as" Xing just use cows, sheep, "means with tweed Xing" just "(red), with just dung" red twips "(red) with sheep droppings, loess soil fertilizer pioneered by the [8]. Xunzi warring states thinker once said: "tree fell for this" (the dung of xunzi, "), "the mask, tian table mu yield, much of the farmer's field, manure and precious things." (" "), xunzi rich students of xunzi han fei also said: "the product of TianChou and filling the dung" (" old han fei zi, solution). Lu shi chun qiu ", and "as" can make fat, also can make the spines." Specify the fertility in soil could change the objective laws. In the period of social transformation in spring and autumn period, "FengQi ii, every state, each breath, scrambling for based on economic development, especially the agricultural production.
From the unearthed han tomb of toilet implement tao can see, in han dynasty, including building common toilet is the most common form of lavatory circle. The turn of WangLiuDan stab yan carrying "... in the toilet of quercetin, bad big officer." Toilet and in a pigsty, then people will have livestock waste treatment of unity consciousness.
Academic circles has in recent years saying to Lao Zi in "land under heaven in Dao De Jing , gallops along on horseback to manure but; Absence of right principles throughout the country , army horse are born in [7] development of suburbs " discuss that. The person is fundamental when that import responds to is a "piping times of peace for the country , raising a horse is for fertile land; That land under heaven raises a horse when chaos caused by war, is to be for going on an expedition but" , also reflect 475-221 B.C. being a Dao De Jing Cheng Shu period, people already has known that excrement enriches the soil to making use of animal, and development agriculture childbirth , accomplishment principle existing. Cheng Shu "law of melting in the Period of Warring States what be carried soil", it is view to make use of fertilizer to reform soil, with becoming fertile soil thin , that what be mentioned among them "cultivates with manure ", is to make use of the various animal manure to come to increasing of soil fertility , "? H uses just " (hard red soil) cow dung in other words ", orange red " (red loess) red use sheep excrement waits if "? H just uses the cattle , the orange red red use sheep ", Anything that is advocated earlier having started because soil applies fertilizer [8]. Warring States last phase thinker Xun Kuang once said: "Set up an assured source of life being that excrement is this " ("Master Xun & # 8226; Grain, is much muck field so that the scholar sheet "), "covers a field expressing a mu , thorn grass breeds, thing of being that farmer masses is multitudinous also ". ("Master Xun & # 8226; Fu Guo sheet ") Xun Kuang student Han Fei also says: "Accumulate the force Yu farmland , must manure at present forcing ("Han Fei Zi & # to drink " 8226; Untie the old sheet "). "Ls Spring and Autumn Annals & # 8226; The sheet " brings forward the Ren field: "Field but the messenger fertilizes , uses thorn ". Have shown clearly a soil fertility not bad objective law changing. The year reforming a period greatly in society Warring States period , independent warlords rise like a swarming of bees , compete for hegemony mutually, every leud strives for survival in order the country keeping a foothold , competes to develop the economy each other, take an agriculture seriously especially giving birth to a child. The lavatory is it can be seen from the bright implement earthenware that the Han Dynasty grave unearths at present, in the Han Dynasty toilet building comparison is common, among them the most common being marks lavatory-in-one form with a circle. "Han Shu & # 8226; Revolution " is loaded with "swallow thorn king Liu Dan , ... The hog group produces , spoils the high-ranking official cooking stove in the lavatory". The lavatory and the pigsty are put in one place, It can be seen that people already mental consciousness having the treatment uniting person animal manure urine at once.