Silicon, rare earth and titanium are all beneficial elements. Commercial fertilizers are now introduced as follows:
Silicon fertilizer. The effective silicon (SiO2) content of commercial silicon fertilizer is generally not less than 20%, and also contains elements such as calcium and magnesium. Due to different raw materials, it has different colors such as white, gray brown and black. It does not absorb moisture. It is a slightly alkaline weak acid soluble fertilizer, which can promote photosynthesis of various crops, enhance nutrient absorption and improve resistance to stress. It can be used as base fertilizer and top dressing. It can be used as base fertilizer for 50kg. After application, it can be ploughed into soil or mixed with organic fertilizer. Topdressing is mainly applied in the late stage of crop growth, such as rice and wheat crops. , winter, early spring, single application or mixed with organic fertilizer, 5-10kg per plant. Another type of silicon fertilizer is water soluble, mainly used as foliar fertilizer.
Rare earth fertilizer. Rare earth fertilizer refers to a fertilizer that adds light rare earth elements. The light rare earth element refers to lanthanum (La), cerium (Ce), praseodymium (Pr), cerium (Nd), and the like of the third subgroup of the chemical periodic table. At present, scholars at home and abroad have two opinions on the agricultural effects of rare earths. One thinks that rare earth elements may belong to the ultra-micro elements necessary for plants, and the other thinks that rare earth elements may belong to crop growth stimulating hormones. However, the consensus is that rare earth elements have a certain physiological activity and promote the growth of crops. Domestic research has proved that it has high-yield and high-quality effects on more than 30 kinds of crops; according to the experiments conducted by China according to the food safety toxicology evaluation program, the rational application of rare earth element fertilizers is safe and reliable. For safe and effective application, the state has promulgated the national standard GB 9668-94 for agricultural rare earth nitrate; issued industry standards for fertilizer application, and stipulated the technical requirements for the addition of rare earth elements to compound fertilizer.
Titanium fertilizer. Tests show that titanium (Ti) is located in the fourth subgroup of the fourth cycle of the periodic table, in the form of oxides or titanates in nature, insoluble in water, so the content in the soil is very low, not more than 0.07mg / kg, Very little can be absorbed and utilized by crops. Field trials have shown that spraying titanium fertilizer can increase the yield and quality of mulberry leaves, increase the content of chlorophyll, dry matter, soluble sugar and total nitrogen, and increase the yield, silk yield and silk quality of sericulture. At present, research at home and abroad is devoted to the development of products that are water-soluble, easily absorbed by crops, and are non-toxic and inexpensive.
Incidentally, the waste water of rare earth mines cannot be blindly applied or used for irrigation because its composition and concentration are not clear, otherwise serious consequences may occur and it is difficult to eliminate.
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