Microfertilizers contain a proper micronutrients, macronutrients and some "second-line * -.It combines the use of fertilizer in very small doses.It is especially important to monitor compliance with the rules.
most convenient are IMC - polimikroudobreniya, but their role is more preventive.If you noticed signs of a lack of any of the elements, it is better to choose microfertilizer one active principle (ie, containing only the missing element).It is better to give it to the plant as a foliar feeding, that is spraying.
microfertilizers often treated directly before sowing seeds.
zinc source is microfertilizer zinc sulfate (zinc sulfate).Its rate: 0.1 g / l of water for the irrigation of the soil, 0.2 - 0.4 g / l for foliar feeding, 0.3 g / l for seed treatment.
magnesium sulphate: 0.05 - 0.1 g / L of irrigation water to the soil, 0.5 g / l for foliar feeding, 0.3-0.5 g / l for seed treatment.
sources of copper - copper sulphate 2-3 g per 1 m2 of the soil (this dose is enough for three - four years);s
Bor, which is often lacking in acidic soils, introduced as part of normal fertilizer bornodalitovogo -b 5 g per m2 in the ground and up to 24 (!) Gram per liter of water for spraying.It is possible to use boric acid, and in the following dosage: 0.05 g / l of water for the irrigation of the soil, 0.2-0.3 g / l for foliar feeding, 0.1 g / l for seed treatment.There are also bormagnievoe and fertilizer drill.
If you have problems with the help of manganese manganese sulfate (dose: 0.1 - 0.2 g / L of irrigation water to the soil, 1 g / l for foliar feeding, 0.3 g / l for seed treatment) or manganese sludge (1 g / l to irrigate the soil).
Molybdenum is a part of ammonium molybdate.Application rates: 0.03-0.05 g / L of irrigation water to the soil, 0.3-0.5 g / l for foliar feeding, 0.2-0.5 g / l for seed treatment.
Cobalt is part of vitamin B12, it is possible to make with almost any soluble cobalt salt.However, the probability of the deficit in recent years has become very small.Quite the contrary: because of the atmosphere and water pollution cobalt is often in excess, especially in large cities and near industrial plants.
iron stands apart.On the one hand, its lot nearly any soil.On the other hand, in plants iron starvation occurs often enough, even when the chemical analysis shows a rather high soil content of the substance.The fact that it is difficult to extract the plants too often part of the iron unavailable to the plant insoluble mineral compounds.On limestone or calcareous soils to add it from the outside is almost meaningless: the plant cell will not get, it will become an integral part of various inorganic soil.And iron deficiency usually is observed on alkaline soils, so instead of making iron-containing fertilizer, sometimes enough to acidify the ground; then she will give plants their "nest egg."However, there are iron-containing fertilizer.Apply (alas, with very little effect), iron salts, such as its sulfate.In experiments with water (remember that if you want to try to do hydroponic cultivation of plants!) And sand cultures works well iron citrate.Fertilizers are also other iron chelate compounds with organic substances, such as FeHEDTA (chelate gidroksietilendiaminouksusnoy acid).For potted plants with a deficiency of iron in the pot instead of fertilizer can be placed ... rusty nail.
carefully examine the list of macronutrients may be surprised to ask: "But where is the list of fertilizer sulfur" We know the chemistry of this issue is unlikely to arise: Try to count how many times in the fertilizer names mentioned word "sulfate" or "sulfate".All organic fertilizers that element, too, quite a lot.