When watering crops, why do we need to ensure that the soil is dry and wet?

See dry and wet" watering method, that is, the best way to replenish water. When the soil is slightly dry, there is enough air in the crevices of the soil, and the roots can get enough energy from the respiration to carry out life activities, such as absorbing water, nutrients, and the elongation and growth of the roots themselves. When watering, the amount of water reaches the point where water flows out of the small holes in the bottom of the pot, at this time, the soil crevices are filled with water, and the capillary water is fully replenished.

Because the roots of crops need to breathe in the soil, when watering crops, it is necessary to wait for the soil to dry out, and through the process of alternating dry and wet, it can be more conducive to the root respiration of crops.

The purpose of seeing dryness is to prevent too much water content, soaking the roots and rotting them, affecting the growth and fruiting of plants, and seeing moisture is to keep the soil nutrients and prevent plants from drying up due to lack of water.

In Nantong, the southern part of Tongliao City, my hometown, which is related to the northern part of Liaoning Province, belongs to the mountainous area and lacks water. People have eaten in the sky for years, the rain still hurts a bit, and the end of the year with a drought. Large areas of vast and arid, dry water are basically lacking in this case.

However, hard work is not tolerant, land is abandoned, and many of the three saving techniques have been summed up over the years. This is a common method for our Namani flag, introducing it to everyone, willing to drought, water scarce land is not broken.

It is usually necessary to build a horizontal terrace on a slope of 6 to 20 degrees. The slope above 20 degrees returns to the grass, and the grass is usually not planted, and the terrace is not carried out. Make a unified plan and focus on:

It is carried out in a way that is combined with man-made buildings. Use a measuring instrument to determine the roller line of each terrace before constructing the measuring instrument. The squid line is slightly higher than the contour line, and the specific operation is "big bend, small bend".

The length of the terraces is set to the terrain as much as possible. The width is determined according to the slope of the slope, and the steering surface is narrow, and the terraces are usually 8 to 14 meters.

The field has a horizontal level with a slight slope on the outside. The ground is solid, the slope is even, and the top of the kanka is. The field of soil is imagined that the diameter of the Earth can not be greater than 15 mm.

In the field of elevators, there must be roads paved for agriculture and transportation. The main road is 3 meters wide and meters wide. The longitudinal slope of the road should not be greater than 10 degrees, because it is more than 10 degrees to work on the vehicle machinery.

Roads built on slopes greater than 15 degrees are "S" shaped.

After repairing, I immediately turned into soil and sterilized, and received rainwater. After the rainy season, I turned around again. Combine 3000 kg of high-quality farm fertilizer per acre, 30 kg of calcium phosphate, 20 kg of urea, and then wrestle.

Drought resistance is increased by using engineering techniques to build reservoirs that intercept surface runoff or shallow subsurface runoff and supplement irrigation when crops need water. Dramatically increased production. At present, we are mainly promoting the energy irrigation technology for reservoirs.

The technology is to stop the surface of manure, ensure that agricultural water is used in drought noodles, improve afforestation, reduce the loss of fluid lost has a significant effect.

First of all, the current collection environment, near irrigated farmland, water, easy to water, is generally around the corner of the field. Secondly, there is a certain aggregation surface, which can form surface runoff after sedimentation, and water storage cellars can be combined. Depending on the size of the grounding flow, a water cellar can be built.

The third is the conditions for construction, the geological conditions of Jiaoji should be good, avoiding mountain floods, slits and water storage temperatures, steep slopes, sediments, landslides, stacked layers. Everything is non-complete cylindrical spouts with an inner diameter of meters, the cellar is 8 10 meters and the water is 30 cubic meters. It mainly consists of several parts of the cylinder, filter layer, and crystal lattice, which cannot be covered.

The surface can be improved, but the local topography cannot be completely changed. Because watering is not completely moist for an arid land, it is difficult to change an environmental landscape artificially, so watering is only on the surface to alleviate drought.

Watering can improve soil drought, but be careful not to pour directly on the soil.

It can be improved, if there has been no rain in the local area recently, and there are no irrigation conditions, the field corn can no longer continue to emerge, then there is no way, after the destruction of some crops with relatively strong drought tolerance, or wait until the rainfall, plant corn varieties suitable for the local shorter growth period.

a. Timely soil relaxation and ventilation can increase the aeration of the soil, which is conducive to aerobic respiration of the root system of plants, and can promote the absorption of inorganic salts in the soil by the oak trap.

b. The wilting of Liang Nanian in the flooded corn plants is due to the fact that the anaerobic respiration produces alcohol from eggplant, and B is wrong;

c. Bandaging the wound with breathable gauze can inhibit the proliferation of anaerobic bacteria, C is correct;