Trace Element Fertilizers

There are many types of trace element fertilizers, which can be distinguished by element or by type of compound.

According to the elements, there are molybdenum fertilizer, boron fertilizer, manganese fertilizer, zinc fertilizer, copper fertilizer and iron fertilizer. Boron and molybdenum are often anions, ie, borate or molybdate; other elements are cations, and sulfates (eg, zinc sulfate, manganese sulfate, etc.) are commonly used.

1 Boron fertilizer: borax, boric acid, boron mud (boron slag), boron magnesium fertilizer, boron magnesium magnesium phosphate fertilizer, boron-containing superphosphate, boron-containing calcium nitrate, boron-containing calcium carbonate, boron-containing gypsum, boron-containing glass fertilizer, boron-containing fertilizer Mineral, boron-containing clay

2Molybdenum fertilizer: ammonium molybdate, sodium molybdate, molybdenum-containing slag, molybdenum trioxide, molybdenum superphosphate

3 Zinc fertilizer: zinc sulfate heptahydrate, zinc chloride, zinc oxide, chelated zinc, zinc carbonate, zinc sulfide, zinc ammonium phosphate

4Manganese fertilizers: Manganese sulfate, manganese chloride, manganese carbonate, manganese-containing glass, manganese oxide

5 Copper fertilizer: copper sulfate pentahydrate, copper sulfate monohydrate, chelated copper, copper-containing slag, copper carbonate, copper oxide, cuprous oxide, copper sulfide, copper ammonium phosphate

6 Iron fertilizers: ferrous sulfate, ferrous ammonium sulfate, chelated iron, iron sulfate, iron ammonium phosphate

7 Chloride fertilizer: calcium chloride, ammonium chloride, potassium chloride

According to the type of compound, it can be divided into 1 soluble inorganic salt: it belongs to instant soluble fertilizer, such as sulfate, nitrate, chloride and so on. Molybdenum is molybdate and boron is boric acid or borate.

2 Inorganic salts with low solubility: They are slow-release micro-fertilizers such as phosphates, carbonates, and chlorides.

3 Glass Fertilizer: It is a silicate type powder containing trace elements. It is a glassy substance that is melted or sintered at high temperature, and its solubility is very low.

4 Chelate fertilizer: It is a natural or synthetic chelating compound that chelates with trace elements.

5 Compost: It is a compound fertilizer made by adding one or more trace elements in NPK fertilizer.

6 Compound Fertilizer: It is a compound made of N, P, K and a trace element or several trace elements.

7 Industrial wastes containing trace elements: They often contain a certain amount of certain trace elements and can also be used as trace element fertilizers. They are generally slow-acting fertilizers.

In addition, various organic fertilizers contain a certain amount of various trace elements, which is a source of fertilizer for trace element fertilizers. However, organic fertilizers cannot be considered to fully meet the needs of crops for trace elements.

Commonly used types of boron fertilizer: mainly boric acid and borax. They are all white powders that are easily soluble in water. The boron content is 17% and 13%, respectively. Usually 0.05-0.25% borax solution is applied to the soil.

2 Zinc fertilizer: mainly zinc sulfate heptahydrate (ZnSO47H2O, containing about 23% of Zn) and zinc chloride (ZnCl2, containing about 47.5% of Zn). All of them are white crystals that are easily soluble in water and should be prevented from being fixed by phosphorus when applied. Usually, they are soaked with 0.02-0.05% ZnSO47H2O solution or with 0.01-0.05% ZnSO47H2O solution for foliar dressing.

3 Molybdenum fertilizer: Ammonium molybdate [(NH4)2MoO4] is commonly used, containing about 50% of molybdenum, and containing 6% of nitrogen, easily soluble in water. Commonly used 0.02-0.1% ammonium molybdate solution

spray. It has a good effect on legumes and vegetables, and has little effect on the crops.

4Manganese fertilizer: Manganese sulfate crystal (MnSO43H2O) is commonly used, containing 26-28% of manganese, which is a pink crystal that is easily soluble in water. Generally used 0.05-0.1% aqueous solution containing manganese fertilizer spray.

5 Copper fertilizer: Commonly used copper sulfate pentahydrate (CuSO45H2O), containing 24-25% copper, is a blue crystal that is easily soluble in water. Usually sprayed with 0.02-0.04% solution or soaked with 0.01-0.05% solution.

6 Iron fertilizer: Commonly used green earthworm (FeSO47H2O). The green wolfberry was formulated to give a 0.1-0.2% solution.