Mineral fertilizers contain nutritious elements necessary for plants and are brought to fill shortage in the soil of nutrients. Emit plain and complex mineral fertilizers. Simple contain one substance, difficult consist of several.
Nitrogen fertilizers
Make three types. Sulfate of ammonium contains ammoniac fertilizers, ammonium nitrate – nitrate, urea contains amide fertilizers. Ammoniac bring in the spring or in the fall as they gain a foothold in the soil and can be absorbed by roots of plants a time later. Nitrate in the soil are not late - it is so-called "fast" fertilizers which are introduced as fertilizing in the summer, during the vegetative period. Amide work even quicker and at the increased temperature pass into form of ammoniac fertilizers.
Phosphoric fertilizers
Can be soluble and insoluble (semisoluble). Soluble – plain and double superphosphate – are easily dissolved in water. Semisoluble are dissolved in weak acids (for example, precipitated calcium superphosphate). Insoluble are dissolved only in acids (phosphate rock). Soluble bring on any soil, having mixed with water. Insoluble and semisoluble bring dry on sour soils, having mixed with them.
Potash fertilizers
Chloride potassium and potash salt is used. They are soluble in water and not quickly get into the soil. Bring them in that level of the soil where small roots develop. On sandy soils the need for potash fertilizers is higher, than on clay.
Chloride fertilizers
Such element necessary for plants as sulfur enters them. Chlorine which is there in mix with sulfur is not necessary to plants. It is only the catalyst for effect of sulfur. Therefore it is necessary to introduce chloride fertilizers beforehand, since fall. Sulfur remains in radical soil layer, and chlorine by spring is washed away and does not harm plants.
Microfertilizers
They contain substances to a lesser extent necessary for plants. But nevertheless the lack of these substances can lead to yellowing or subsidence of leaves, defeat by diseases, wreckers and to other problems. It is pine forest, copper, manganese, molybdenum, zinc. As microfertilizers chemical salts, or complex complex fertilizers, such as to nitrophoska and ammophos are used. When using microfertilizers it is important not to allow overdoses as the excess of any given substance is not less harmful to plants, than its shortcoming. For garden cultures mineral fertilizers are most often introduced under redigging. As for garden, the root system of fruit-tree covers the square equal to the area of krone, and goes beyond its limits for half-meter. On all this square it is necessary to introduce fertilizers. If the soil dry, and during the hot periods you often water garden and kitchen garden, mineral fertilizers it is necessary to bring more as water washes away salts in the soil.