A few months ago, Gong Nanhai didn't have to do anything to get a very cheap micro "knife" from the county yawu. … A piece of land was bought. As for Weishenme, a large area of land near the big river is uncultivated, the Committee of Agriculture thinks that the local land is too large and there is a shortage of labor. However, Wang Tian heard that the "chiefs" had bought this land, and hurriedly ran to tell Wu Nanhai: This transaction is a loss!

In fact, this land has always been cultivated by cultivators from Fujian, but they always planted it for a year or two and then abandoned the land.

"The yield is too low." Wang Tian said, "I have worked hard to plant rice, and the yield per mu is seventy or eighty catties, and I can't even reach this number if I don't wait." Planting two crops can only harvest less than 200 catties of rice, which is not enough to fill the stomach

"Seventy or eighty pounds?" Wu Nanhai was almost shocked. Seventy or eighty catties is just dry grain, and after peeling, it will lose two or three percent. He knew that the level of agricultural production in ancient times was not high, but as far as he was concerned, as far as the general rice fields on both sides of the Wenlan River could be irrigated, it was still possible to produce 300 catties per mu in one crop.

"The old man doesn't know anything," Wang Tian said, "It's not easy to farm locally: if it doesn't rain, it's dry, and if it rains for three days in a row, it's slander." However, even if the United States and Taiwan do not suffer from drought and slander, they will not be able to harvest much rice from planting. ”

Wu Nanhai was surprised by this phenomenon, but because he was unable to develop it for a while, he did not investigate further. In order to prevent large areas of land from being abandoned, he had the peasants extensively plant some leguminous crops and green manure for silage on the land, some of which he had brought from another time and space. Some were found by long-range exploration teams. The result was quite dismal, with the exception of the barely decent yield of the first load, and the almost total destruction of the leguminous crops.

"The land is severely deficient in phosphorus. Soil improvement should be done

"So the low yield is probably a problem with the soil environment." Fa Shilu listened to his description and said, "We have not carefully investigated the soil quality and harvesting of the United States and Taiwan.

"Could it be that the pH of the soil is too high?"

Fa Shilu said: "It is possible. Since it is a high-yield and stable-yielding field, it involves the issue of improving the soil

He picked up some soil on the ground at random: "If I remember correctly, the soil in Lingao should be the same as the main soil type in Jiangxi and Guangdong, mainly brick red soil. In this case, it is relatively easy to improve, and the lime will be able to do the trick. If it's alkaline soil, you'll have to look for gypsum

He rubbed it slightly: "This red soil is developed from basalt, plus the sand washed down from the upstream by the river over the years. In general, the sand is heavier, but it is not a big problem for the rice fields

As she spoke, Chu Qing returned, carrying a large basket full of bottles of kvass and kombucha drinks.

"There is no stock in the canteen, so I went directly to the food factory to get it." Chu Qing smiled and said, "I'll soak it in water first." So saying, he carried the basket and went to a stream down the slope.

These two beverages have been officially mass-produced in food processing plants, semi-automatic filling, and hand-sealed bottles. The bottles are supplied by the glassworks and sealed with cork and wax. Because of the lack of preservatives, only sugar and citric acid can be used to preservative, so the shelf life is very short. It doesn't taste very good.

But for the traversal who were tired of drinking tea and boiled water, these two drinks came at the right time and suddenly became a hot item in the canteen. Many natives who bought a bottle out of curiosity also liked the taste, and some simply went out of the way of imitating the way of life of the people.

Fa Shilu watched her soak the basket in its entirety into the stream. The edge of this field is dotted with many low hills, and unlike the sparsely grassy fields, the vegetation on the hills is dense, and there are many ground streams between the hills, and the gurgling water flows among the verdant grass and trees. Some of them converge into large surface runoffs into the Wenlan River, some converge into pools between the hills, and some flow on the ground for a while before diving underground.

"The water is so abundant!" Fa Shilu muttered to himself.

"Have you investigated the water source here?" He suddenly asked Yan Quezhi. Yan Quezhi was originally staring at Chu Qing's back, but then he came back to his senses:

"No, the geological side of things is under the management of the remote exploration team. I didn't have time to help build a house at a construction company

"Since you are a hydrological student, you should know a little bit about it. Is the surface runoff here a spring? ”

"It's not mineral water, but it's good. The water quality is clear and the water temperature is low. "It should be that the precipitation has accumulated into the ground before it emerges." ”

"That's right." Fa Shilu nodded, and he beckoned everyone, "Let's go, let's go down to investigate the soil conditions here." ”

Several people walked down the hill together, and Wu Nanhai took his apprentice from the school to choose Lu Jia. Lu Jia's family is an official tenant, specializing in cultivating and learning fields. The burden of official tenants is very heavy, and it is far more difficult than that of ordinary tenants. In order to have a few fewer mouths, Lu Jia's father gave Lu Jia and Lu B's two brothers

"As soon as the Yue Group came, it was purely a mixed meal. Lu Jia is older. He knew a lot of farm work and was clever, so he was accepted as an apprentice by Wu Nanhai.

The group made several probes at intervals on the wasteland to take samples and observe the soil.

"Old law! It's still brick-red soil. It's everywhere, Wu Nanhai said.

"That's right, it's the most common soil in southern China." Fa Shilu squatted on the edge of the pit, "The fertility of this soil should be good. It would be strange to say that it would be strange to grow rice on such land for less than a hundred catties. ”

But further excavations soon revealed the mystery of the site's low yields. They began to dig up large quantities of rusty paddy soil. This kind of soil is caused by long-term poor drainage and irrigation, water accumulation in the soil layer, a large amount of rust-red hydroxide in the soil, high soil acidity, low content of nitrogen, and bell, and poor soil fertility.

"Strange, this is supposed to be caused by long-term standing water." Wu Nanhai said, "But this place is still far from the highest water mark of the Wenlan River in the rainy season." ”

"The water table in this place is high." Fa Shilu pointed to the lower hilly area, "The water of the stream, zuihou has dived underground. It looks like a plain, but in fact it is equivalent to a sponge full of water underneath, typical of waterlogging. ”

Yan Quezhi put up the equipment and observed: "Well, the terrain here can't be felt at all, but it is actually lower than the surrounding places, and the spring water in the hilly area is constantly replenished. The groundwater level is very high, so there is a long-term hidden fullness situation. ”

"That's right, otherwise there would be no way to say that Weishenme would have such a wide range of rusty paddy fields." Fa Shilu said, "Historically, the United States and Taiwan have not only been cultivated by people, but also paddy fields have been cultivated quite extensively. Zuihou was abandoned because of the soil problem. ”

He says this because paddy soil is essentially an artificial soil, developed by irrigating water every year in areas where rice is grown. In nature, there is generally no such soil structure.

"Master, this is called the Rusty Paddy Field here." Lu Jia interjected, "There is often a layer of red rust like oil on the surface of the paddy field. Actually, there are some rotten wet fields here, all on the side of the small hills."

"Rotten wet fields?. Wu Nanhai became interested, "Have you planted it in your family?" ”

"Nope." Lu Jia shook his head, "It's going to be a loss to farm here."

Except for Fu Lao who came to open up the wasteland without knowing it, no one in the county would come here to farm. ”

"Let's go, let's take a look." Fa Shilu proposed.

Soon they came to a hillside underneath, which at first glance looked like an ordinary wasteland, but if you looked closely, it looked like it had been reclaimed, and the ridges could still be faintly seen.

"There have been blessed guys here who have planted here in the past. zuihou is not available. Lujia said, "The good fields were flooded, and the rice was flooded." ”

They probed again. The situation here is even worse than there, and water comes out almost as soon as it is dug up, and in some places there are springs. Due to long-term water accumulation, the soil moisture is oversaturated, the soil is extremely scattered, the texture is sticky, paste-like, difficult to cultivate, and the soil layers are not distinct.

"The fertility of this soil will not be good." Wu Nanhai stirred with the mud, and separated a lot of dead leaves and grass from it. It's all intact and barely decayed, "and the organic matter basically doesn't decompose." ”

"Because it's too turning." Fa Shilu said, "The air can't get in. It is equivalent to a confined environment, how can organic matter decay? He shook his head. This kind of field is more difficult to do. ”

Wu Nanhai seized this opportunity. Lu Jia was taught for five minutes what organic matter is, and organic matter weishenme will decompose. What are the benefits of organic matter decomposition for planting? Whether he understands it or not, first pour the concept directly into it.

"The key is drainage." Fa Shilu made the final decision.

To change this situation, it is not enough to improve the soil, but to solve the fundamental problem: internal slander.

"To solve the problem of fullness." Pointing to the survey map, he said, "We have to expand the size of the drain." The water table is too high. At least 2 meters must be lowered to 2 meters to be suitable for farming. If necessary, a special pumping machine will have to be added. The five drainage branch canals planned now may not be sufficient, and three more need to be added. ”

"In that case, your embankment project is not small."

"The embankment is originally there in the reconstruction of the Wenlan River Basin." Yan Que Zhi said, "According to the Jihua of Ma Du Gong. In the future, the water surface of the entire Wenlan River will be raised by centimeters to facilitate navigation. At the moment, all the facilities along the river are in accordance with this plan."

According to Jihua, "a dam along the river should be built along the development zone to isolate the river water from the entire area of high-yield and stable-yielding fields, and to prevent possible flooding during the rainy season." A sluice gate for an aqueduct is set on the embankment. In addition, a steam pumping station was installed, and the steam engine was used as the power for irrigation and drainage. If you want to know what happened next, please log in to the muscle, more chapters, support work

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