"Xia Qing, if you do this in the military aircraft workshop, is it possible that you are doing this wasteland...... Saline land, how to convert it into arable land that can be cultivated? Li Shimin looked at the land in the greenhouse and asked.

Xia Hongsheng nodded: "Yes, there are actually many methods, but because the places where the saline-alkali land is divided are different, there are different methods according to the characteristics of different places." It is not a one-size-fits-all approach. The big idea is the same, though. ”

"Tell me in detail!" Li Shimin looked solemn and said.

Xia Hongsheng rubbed his nose and said, "Back to Your Majesty, if you want to solve the problem of saline-alkali land, you must first know how saline-alkali land is formed." I don't know if Your Majesty has paid attention to it, but wherever it is saline-alkali land, there are some common characteristics. The first is that precipitation is low, evaporation is high, and salts dissolved in water tend to accumulate on the surface of the soil. The second is the topography, the height of the terrain has a great influence on the formation of saline-alkali soil, the height of the terrain directly affects the movement of surface water and groundwater, and it is closely related to the movement and accumulation of salt. Saline-alkali soils are mainly distributed in inland basins, intermountain depressions and flat plain areas with poor drainage, while from the perspective of small local topography, soil salt accumulation is the opposite of large topography, and salt often accumulates in small local convex places. Therefore, it is not difficult to find that there are two main reasons for saline-alkali land, less precipitation and low overall terrain. These two are currently unsolvable. ”

"Since there is no solution, what did Xia Qing do?" Li Shimin asked.

"Your Majesty, although the precipitation and terrain cannot be artificially controlled, we can start from some other aspects to improve the saline-alkali land as much as possible." Xia Hongsheng said: "The land cannot grow crops because there is too much salt in the soil. The method that Weichen tried here was to use earthworms to improve the saline-alkali land. ”

"Worms?" Li Shimin looked at Xia Hongsheng in surprise: "Can this earth dragon improve the saline-alkali land?" ”

Xia Hongsheng nodded and said, "Yes, Your Majesty." And this method is the simplest, easiest to implement, and the effect is very good. ”

"That's a novelty!" Li Shimin was very interested in this, and immediately said: "Come quickly for me!" ”

Xia Hongsheng nodded and said to Li Shimin: "Your Majesty, the dung of the earth dragon has a very good effect on improving the saline-alkali land. The dragon is extremely easy to breed, and only sludge is needed. The earth dragon is a treasure, but when the sludge is swallowed into its stomach and turned into feces, it becomes a very effective fertilizer. In the summer, when there is more rain, the salt in the soil seeps down with the rainwater, and the salinity in the soil decreases. Taking advantage of this time, a large amount of earth dragons are put into the soil, and then straw and the like are spread in it and allowed to ferment. The earth dragon feeds on the soil, swallows the soil of the saline-alkali land into the belly, and turns it into fertilizer, as long as the number of the earth dragon reaches a certain number of trees, the original saline-alkali land can grow crops in a year's effort. Your Majesty, this method can not only improve the saline-alkali land, but also kill several birds with one stone! ”

"How do you kill each other?" Li Shimin asked.

"Your Majesty, Xunzi has clouds, worms have no benefits of claws and teeth, strong muscles and bones, eat the soil on the top, and drink the yellow spring on the bottom." Xia Hongsheng said to Li Shimin: "Although this earth dragon can't really drink the Yellow Spring, it drills around in the soil, which is a disguised turn over the land, destroys the land fiber, and blocks the salt in the groundwater from seeping into the soil with evaporation, reducing the salt in the soil. The earth dragon swallows the saline-alkali soil with a large salt content, and after it is eliminated, it becomes fertilizer, so after the earthworms are raised in the soil, the land will become very fertile, which is conducive to the growth of crops, and the other is also. The number of cultivated dragons in the field is small, and it does not work, and the number is too large, which affects the growth of crops and destroys the root system. The experiment that Weichen did in the military machine workshop was to find out how many earth dragons were best and most appropriate to control the number of earth dragons in each half acre of land. The extra earth dragon can be caught, sold as medicinal herbs, or used as fodder to feed the chickens and ducks raised. Chickens and ducks like to eat this thing the most, and the chickens and ducks raised by eating this thing are strong, the meat is fat, and there are many eggs, and they are delicious to eat. You can keep the eggs, and you can sell chicken and duck meat. And using the earth dragon to breed chickens and ducks, the feces of chickens and ducks can be collected and put into the ground to fertilize the land. In such a circle, every link is useful, there is no waste, and good results are obtained, forming a good cycle, which is called circular agriculture! ”

"The soil raises the dragon, loosens the soil and fertilizes the land, improves the saline-alkali land, and gets grain; The earth dragon can be used to feed the chickens and ducks, and the chickens and ducks are obtained; The dung of the chickens and ducks can go to the fertile land, and they can get grain and earth dragons - and the earth dragons can turn back to loosen the soil and feed the chickens and ducks...... Circle after circle, not only improved the land, got crops, but also got chickens and ducks......" Fang Xuanling muttered in his mouth: "Okay! What a cycle! Interlocking, interlocking, interlocking, ringing, good! Your Majesty, this law ......"

Fang Xuanling's eyes burned and he looked at Li Shimin.

Li Shimin raised his hand, signaled Fang Xuanling to be calm, and said to Xia Hongsheng: "This method may be extended?" ”

"Wechen has been trying it out in Jingyang for two years." Xia Hongsheng said to Li Shimin: "However, as Weichen said, the specific situation of each place is different, so it is not that this model can be applied to the local situation everywhere." The general direction is like this, one ring and one ring complement each other, and the ring benefits are profitable. However, the specific model still has to be combined with the specific local situation and specific arrangements. For example, in Jingyang, because there is no saline-alkali land in Jingyang, Weichen ordered the farmers in Zhuangzi to plant grain, and at the same time there was a chicken farm in Zhuangzi, using a part of the grain to feed the chickens, and the leftover material of the mixed crops of chicken manure was fed to the pigs, and the pig manure was fed to the fish after fermentation, and the pond mud in the fish pond was used as fertilizer to fertilize the cultivated land and increase grain production. It's also a virtuous circle. And every link has benefited. ”

"Xia Qing means ......," Li Shimin asked.

"Your Majesty, Weichen means that we can promote the concept of circular agriculture, rather than a specific model." Xia Hongsheng replied: "We can promote this concept and then combine it with the model of improving saline-alkali land or Jingyang as an example. If the situation in any place is the same as these two situations, you can copy the past, if it is different and cannot be used, you can also use this way of thinking to consider it in combination with your own local situation. ”

Li Shimin thought for a while and said, "Regarding this matter, after I go back, Xia Qing will prepare a recital for me." ”

Xia Hongsheng nodded, and Li Shimin left there and went to visit other courtyards. (To be continued.) )