ps: Congratulations to Zhuang John on his promotion to the position of head of Chujiazhai, the promotion of the first house girl in Jiangnan to the position of hall master, and the promotion of the magic knife boy to the position of helmsman!

Everyone saw that Chu Jiaqiang had already raised his trouser legs and was about to weed in the paddy field, and they also followed suit, moving their muscles and bones.

At this time, the weeding work is not difficult, and there are not many aquatic weeds in the paddy fields. There are not a lot of weeds that can be soaked in water all day long, and the transplanting of seedlings is about a month, which is not long, so there is not much grass in it, and it is relatively easy.

Soaking paddy fields in water can not only inhibit the growth of weeds to a certain extent, but also have many other benefits. This is the way that rice can not only grow safely in the water, but also live a good life.

"Rice is so dependent on water! If it were another plant, I'm afraid I don't know how many times it would have died. Zhou Furong stepped on it, the water was still as deep as his feet, and he said suddenly.

"Huh! It can't be said that flooded fields actually have a lot of benefits, but some plants enjoy the five blessings. Chu Jiaqiang said with a smile.

He explained to Chen Wu and others that the soil in the paddy fields in the south is called paddy soil. Paddy soil is formed under the influence of a certain natural environment and the use of various cultivation measures after people plant rice.

Due to long-term irrigation and alternating wetting and drying, it forms soil traits that are different from those of dryland. During the irrigation period of paddy soil, the tillage layer is saturated with water and presents a reduced state. In the drainage, drying, autumn and winter dry fields, the tillage layer is in an oxidized state. This periodic process of alternating wet and dry soils forms the physical, chemical and biological properties unique to paddy soils.

"Under the condition of flooding and hypoxia, the decomposition of organic matter is relatively slow, the degree of humus is high, the fertilizer efficiency is relatively stable, and the nutrient loss is less. However, if the soil is more reducible and the organic matter is decomposed by gas, a variety of organic acids will be produced, which will hinder the oxygen secretion capacity of rice roots. When the reduction is stronger, it will also produce toxic substances such as methane and hydrogen sulfide to poison the rice roots. In severe cases, the rice roots turn black, rot, and die. Chu Jiaqiang analyzed.

The others listened very unpleasantly, and Li Quan said depressedly: "That's what you learned when you went to college?" ”

"Huh!" Chu Jiaqiang rolled his eyes: "Big brother, please!" This thing, junior high school and high school chemistry has already been learned, so can it be used in college? ”

As soon as these words came out. Zhou Furong and others were even more speechless. Save yourself for a while and be even more useless and ignorant.

"Moreover, according to research, a certain reducing environment in paddy fields is still beneficial to the growth of rice. In the reduced state, almost all of the inorganic nitrogen exists in ammonia nitrogen, which is suitable for the absorption and utilization of rice, and at the same time, ammonia nitrogen is cationic. It is easy to be adsorbed by soil colloids and is not easy to lose.

Another characteristic of paddy soil is that after the paddy field is flooded, the pH value tends to increase, and the redox potential decreases, thereby promoting the hydrolysis of iron phosphate, and the phosphate of high-valent iron is reduced to the phosphate of low-valent iron, and the iron-silicon complex is also reduced. As a result, the content of available phosphorus and silica in the soil increases, which is conducive to rice absorption.

However, sandy paddy fields with strong leakage and paddy fields with more active iron, aluminum and calcium phosphate are the main paddy fields. Available phosphorus decreases. For this kind of paddy field, it is necessary to increase the application of organic fertilizer and phosphorus fertilizer at the same time to meet the demand for phosphorus for rice growth. Chu Jiaqiang spoke again.

This time, what Professor Wen said to Chu Jiaqiang at that time, and the experts said a lot at the beginning. Chu Jiaqiang just listened to this.

In addition, after the field is flooded, the ferric iron is reduced to ferrous iron, which is soluble in water, and similar changes occur in manganese. Potassium is also partially replaced by iron, manganese, ammonium and other ions to be released for rice growth. Moreover, ferrous and hydrogen sulfide combine to form ferrous sulfide precipitation, which reduces the harm of hydrogen sulfide.

These are the favorable aspects of rice growth formed by the appropriate reduction environment of paddy field after flooding, but when the reduction degree is too strong or the reduction state is too long, it is not conducive to rice growth.

Therefore, it is necessary to use drainage and irrigation technology, drying fields, tillage and other measures to make the soil have appropriate leakage performance to water, so as to adjust the redox state and pH value in the soil, continuously update the soil nutrient environment, and meet the nutrient needs of rice growth and development.

"Huh! Whose duck is that? Running to your paddy field, aren't you afraid that they will spoil the rice? Chen Wu suddenly saw a flock of ducks foraging for food in the field at the other end, chirping non-stop.

"Generally, if you grow in the farmland for about a month, you will not be afraid of ducks trampling. In the past, the villagers usually let the ducks out at this time. Chu Jiaqiang explained.

Some time ago, the villagers consciously locked up the ducks, just to prevent them from escaping into the paddy fields. At that time, the seedlings were not stable and were not suitable for disturbance.

Now it's different, the seedlings have taken root, it can be said that they are growing steadily, and there is no worry about that aspect.

"Moreover, it is also useful to put ducks at this time. When these ducks come to the paddy fields, they can often eat the insects that breed in the water, and even some aquatic plants will be trampled or eaten by them. Chu Jiaqiang glanced at the past and immediately smiled.

Of course, in addition to insects, there are also some small fish and shrimp, all of which they like very much.

"Hey! What kind of egg is this? It's so big, and it is so irresponsible to run to the farmland to lay eggs. Zhou Furong suddenly found a blue-white egg in front of him, and immediately walked over and picked it up.

Chu Jiaqiang looked at it and immediately said, "What bird eggs?" Duck eggs only! ”

"Duck eggs? No way? Who would throw a duck egg here? Zhou Furong didn't believe it, but he still insisted in his heart, this is some kind of bird's egg. Because in his mind, isn't a duck a poultry? Will poultry run outside to lay eggs? It's illogical!

"What to throw here? It's here in itself, okay? Ducks lay eggs, it's all so casual. Therefore, sometimes you have to look for duck eggs, and you have to search far away to find them, and the villagers hate the duck the most. Chu Jiaqiang said.

In the past, such things were not uncommon, and I picked up a lot of duck eggs in the paddy fields. These ducks come to the paddy fields to find food, and suddenly they want to lay eggs, so they just find a random place to squat down.

If you find this kind of duck egg in time, it's fine, if you let it soak in water for several days, or even more than ten days, it will definitely spoil.

"Why is this like this?" Chen Wu and the others stared at each other in disbelief, and the image of the duck in their hearts suddenly collapsed.

"Otherwise, what do you think? Ducks are really not very responsible, and many ducks don't even hatch eggs. Therefore, some farmers use hens to hatch ducks. Chu Jiaqiang said unabashedly.

The character of the hen, Chen Wu and others have also seen that the hens in Chu Jiaqiang's house not only hatch ducks, but also swans. In the backyard, you may see a flock of chickens with a few ducklings and geese mixed in.