When determining the amount of fertilizer needed for a crop, the amount of various elements absorbed by the entire growth and development cycle must be taken under the premise of ensuring the normal development of the crop, and also those elements similar to the catalyst and enzyme should be considered; When the soil is fertilizing capacity, based on the analysis of the various nutrients in the soil, the pH value of the soil solution, soil moisture and nutrient retention (CEC), electrical conductivity (EC), and redox potential ( EH), the balance of anion, cation and base, the interaction between inorganic nutrients and other factors to determine the actual fertilization capacity of the soil; when determining the fertilizer utilization rate, we must consider the soil after the fertilizer is applied. The pH of the solution. CE, CEC, EH, the important role of various nutrients, the balance of anion, cation and base, the influence of soil parent material, microorganisms, organic matter and water, gas, light and heat on the effectiveness of fertilizer. To apply fertilizer. The new balance of soil fertility after formation, the percentage of crops actually absorbed as fertilizer utilization.
In summary, the scientific application of fertilizer should grasp the following principles: First, when considering fertilization varieties, we must first know what elements are missing in the soil, whether the absolute quantity of these elements is really lacking, or why there is any reason to make use of these elements. The rate is limited and what methods can be used to eliminate these limits so that we can determine what fertilizer to apply. Second, we must have an ecological awareness, we must work hard to improve the utilization rate of fertilizers, avoid increasing the cost and polluting the environment because of excessive fertilizer application. Third, we must have the awareness of land raising and sustainable development. As long as we pay attention to the application of organic fertilizer, medium and trace element fertilizers, we constantly adjust the balance of pH value of soil solution, soil moisture and nutrient retention (CEC), so that the interaction between inorganic nutrients is changed from mutual antagonistic to Mutual promotion, improve soil structure, and make the soil ecological environment continue to develop from a lower level of balance to a higher level of balance, and the land can be more and more fertile.
Source: Gansu Provincial Agriculture and Animal Husbandry
Talc (Talc) is a layered silicate which is a hydrate.
Theory of MgO style chemical formula 3, 4 - SiO2, H2O, and the theory of chemical composition as follows: 31.68% MgO style SiO2 H2O 63.47% to 4.75%, the natural quality of pure talc ore are very few, most associated with other mineral impurities, common associated minerals include chlorite, serpentine, magnesite, tremolite, dolomite, etc.
Talc is often white, light green, microstrip pink, light grey, with impurities the more the color is deeper, even dark grey, black.
Monoclinic crystal system, ore presents flaky, fibrous and dense.
Pearly luster or oily luster, the heating effect of the talc are substantially heated, lose adsorbed water during 120 ~ 200 a??, 600 a?? when begin to lose part of the structure of water, until 1050 when the structure all the water out.
The best way to identify talc is to conduct X-ray diffraction analysis or thermal analysis.
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