Why can't good beans be grown on humid land? Why can good seeds be grown on hard land?

"塇" means soft soil. Agricultural proverb: bury wheat, expose beans. Wheat should be planted deep, and beans should be planted shallowly. Why do you say that? Wheat has pointed needles, which can easily break through the soil layer after germination, so it can be planted deep; beans are planted shallowly, and bean sprouts are round-topped, so it is not easy to break through the soil if planted too deep. If the soil is hard, artificial assistance is needed to dig up the soil layer so that the seedlings can emerge normally.

Why can't good beans be grown on dug soil?

Because the soil is soft and breathable, the water and heat evaporate faster on the swamp. On the other hand, the hard soil is firm and breathable, so the water and heat evaporate slower than on the swamp. It is because of this difference that beans grown on the swamp often fail to meet the requirements for bean germination due to the large amount of evaporation, and the temperature and water content are often insufficient, so they dry up before they germinate. On the other hand, the hard soil evaporates water and heat more slowly, and with the right temperature and water content, the beans are more likely to germinate.

The principle of how fast or slow the heat and moisture evaporates from soft and hard ground is similar to the clothes we wear. When we wear ordinary clothes, which are soft and breathable, we feel dry. If we wear leather clothes with fine texture and poor breathability, we will feel hot and humid.

Why can hard soil produce good seeds?

Why do beans planted on hard ground have good germination? ① Because of the hard soil, the seed drill naturally does not go deep into the ground, achieving the effect of burying wheat and exposing beans. ② The soil on the hard ground is not loose, and the water evaporates relatively slowly, ensuring that the seeds have enough water for germination, so the germination rate is high. (3) Maybe you dig holes manually for sowing, and plant them carefully and evenly, so the germination rate will be good.

Reasons for poor seedling emergence in dug fields

Regarding the problem of poor seedling emergence in the "dry" soil, I have analyzed the following points: (1) The seeds are planted too deep. The planting depth of legumes should be around 5 cm. If the depth is too deep, the seedlings will emerge slowly, and some seeds may even rot, resulting in incomplete seedling emergence.

(2) Planting too shallowly. One of the reasons is that the soil is too soft and the seeds are planted too shallowly. The wind and sun dry the seeds, causing serious loss of moisture in the surface soil, resulting in drought and insufficient moisture for the seeds to germinate.

(3) There are missed sowings during machine sowing. The holes of the plow are blocked during sowing, and it is not discovered in time, resulting in uneven sowing. The seedlings will not emerge well.

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This is because the habit of bean sprouts is that after germination, they first take root downwards to find the bottom layer of soil, and then push upwards after taking root on the hard bottom. The bottom layer of soil in unplowed land is shallow, and the soil in autumn plowed land has been accumulated after a winter and is already solid. The seeds themselves are on the bottom layer of soil. After germination, they take root at the bottom of the soil. They only need to push upwards. The initial strength of the seeds is enough to push out of the soil, so they are large seedlings.

The current arable land is dug land, and the seeds are sown in half the soil. After the seeds germinate, they need to take root, but to take root, they need to find a hard bottom. After finding the hard bottom and taking root, the strength of the young sprouts is almost exhausted, but they still need strength to push the soil up. Many weak seeds cannot push up and just circle halfway. The full seed seedlings have emerged from the soil, but they have become weak seedlings.