ask:
What types of soil nutrients are there in pineapple?
Soil nutrients can generally be divided into five types.
1. Water-soluble nutrients: refers to nutrients that are soluble in water. They are present in soil solutions and are easily absorbed by crops and are highly effective against crops. Water-soluble nutrients include most inorganic salts and ions, such as K+, NO3-, Ca2+, etc., and a small number of organic compounds, such as amino acids, which are simple in structure and relatively low in mass.
2. Exchangeable nutrient: refers to the exchangeable ions that are adsorbed on the surface of the soil colloid. Such as NH4+, K+, Ca2+, H2PO42- and so on. The ions in the soil solution can be exchanged with the ions on the soil colloid and remain in dynamic equilibrium. The two have no strict boundaries and are effective for crops. Therefore, water-soluble nutrients and exchange-type nutrients are collectively referred to as available nutrients.
3. Slow-acting nutrients: mainly refers to the nutrients that are more easily released in some minerals, such as potassium fixed between clay mineral layers and potassium in some biotite. This part of the nutrients is less effective for seasonal crops, but can be used as a source of replenishing nutrients.
4. Insoluble nutrients: nutrients that are present in primary ore and are not easily decomposed and released, such as potassium in feldspar, which can only be absorbed by crops if they are released during long-term weathering. Insoluble nutrients, also known as delayed-acting nutrients, are reserves of crop nutrients.
5. Organic nutrients: refers to the nutrients present in the soil organic matter. According to the difficulty of plant absorption and utilization of nutrients, it can be easily divided into quick-acting nutrients and late-acting nutrients. In general, available nutrients only account for a small portion, less than 1% of the total amount. It should be noted that the division of available nutrients and delayed nutrients is relative, and the two are always in dynamic equilibrium. The factors affecting the soil nutrient form are: weathering conditions of soil minerals, cultivation management of farming areas, fertilization, irrigation and artificial habitat.
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