The nutrient absorption of crops mainly depends on the root system. All kinds of crops have large root systems, and there are downward growth habits. The root hair zone about 1 cm from the root tip is the most active area for nutrient absorption. There are many root hairs. The root hairs are connected, and the total length is up to 20 kilometers. Therefore, the area where the roots absorb nutrients in the soil is quite large, and the more developed the root system, the stronger the ability to attract fertilizer. Root absorption of nutrients depends mainly on mass flow, diffusion and interception in three ways. Mass flow refers to the massive flow of water to the root zone through the water transpiration of the crop, which produces a mass flow. The nutrients in the soil solution are absorbed by the root as the soil moisture migrates to the surface of the root. Diffusion means that crop roots constantly absorb non-flowing nutrients in the soil, making the concentration of nutrients in the vicinity of the rhizosphere relatively lower than other parts of the soil, resulting in a difference in nutrient concentration between the nutrient concentration in the soil and the soil on the root surface. Nutrients migrate from the high to the low root surface and are absorbed by the root. Interception means that the root system is in direct contact with the nutrients in the soil and exchanged with ions. It is not absorbed by the roots through transportation. The amount of nutrients absorbed depends on the size of the contact area between the root system and the soil. From the point of view of the characteristics of root-absorbing fertilizer, fertilization should pay attention to depth or position, so that the fertilizer is concentrated in the densely-rooted area, and the contact area between the fertilizer and the root system is increased, and fertilization must also be combined with watering to dissolve the fertilizer in water. The mass flow and diffusion patterns are absorbed by the crops to increase the utilization of chemical fertilizers and also prevent fertilizers from sprouting. Since carbon, hydrogen, and oxygen are mainly provided by water and air, and nitrogen, phosphorus, and potassium are provided by soil and fertilizer, nitrogen, phosphorus, and potassium are called three elements of fertilizer. Since carbon, hydrogen, and oxygen are mainly provided by water and air, and nitrogen, phosphorus, and potassium are provided by soil and fertilizer, nitrogen, phosphorus, and potassium are called three elements of fertilizer. Since carbon, hydrogen, and oxygen are mainly provided by water and air, and nitrogen, phosphorus, and potassium are provided by soil and fertilizer, nitrogen, phosphorus, and potassium are called three elements of fertilizer.
To cause a temporary loss of sensation with medicine or acupuncture.
Figurative use of some means to make people vague, depressed
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