Microfertilizers

Microfertilizers contain both micronutrients proper and some macroelements of the "second row * -.Combines these fertilizers with their application in very small doses. It is especially important to monitor compliance with standards.

The most convenient are PMU - polymicro fertilizers, however their role is rather preventive. If there are signs of a lack of any of the elements, it is better to choose microfertilizer with one acting principle( that is, containing only the missing element itself).It is better to give it to the plant in the form of foliar top dressing, that is, spraying.

Often microfertilizers treat the seeds directly before sowing.

The source of zinc is microfertilizer zinc sulphate( zinc sulfate).Its norm: 0.1 g / l of irrigation water for soil, 0.2-0.4 g / l for foliar top dressing, 0.3 g / l for seed treatment.

Magnesium sulphate: 0.05-0.1 g / l of irrigation water for soil, 0.5 g / l for foliar top dressing, 0.3-0.5 g / l for seed treatment.

Sources of copper - copper vitriol: 2-3 g per 1 m2 in the soil( this dose is enough for three to four years);Copper sulfate( sulfuric acid copper): 0.05-0.1 g / l of irrigation water for soil, 0.1-0.2 g / l for foliar top dressing, 0.03 g / l for seed treatment. Less commonly used( for the soil) pyrite cinder, their dosage should be large.

Boron, which is often lacking in acidic soils, is applied as part of a borodalite fertilizer at a rate of 5-g per m2 per soil and up to 24( !) G per liter of water when sprayed. You can also use boric acid in the following dosage: 0,05 g / l of irrigation water for soil, 0,2-0,3 g / l for foliar top dressing, 0,1 g / l for seed treatment. There are also boron-manure fertilizers and borax.

In case of problems with manganese, manganese sulfate will be helped( doses: 0.1-0.2 g / l of irrigation water for soil, 1 g / l for foliar feeding, 0.3 g / l for seed treatment) or manganese sludge( 1g / l for watering the soil).

Molybdenum is a component of ammonium molybdate. Norms of application: 0,03-0,05 g / l of irrigation water for soil, 0,3-0,5 g / l for foliar top dressing, 0,2-0,5 g / l for seed treatment.

Cobalt is a component of vitamin B12, it can be added together with almost any soluble cobalt salt. However, the likelihood of a deficit has recently become very small. Even vice versa: due to the pollution of the atmosphere and water, cobalt is often in excess, especially in large cities and near industrial enterprises.

Iron stands apart. On the one hand, it is much in almost any soil. On the other hand, iron starvation in plants is observed quite often, even in cases where the chemical analysis of the soil shows a fairly high content of this substance. The fact that plants it is difficult to extract: too often iron is a part of inaccessible to the plant insoluble mineral compounds. On limestone or carbonate soils, adding it from outside is almost meaningless: the plant will not get the element, it will become an integral part of different soil inorganic substances. And iron deficiency, as a rule, is observed on alkaline soils, so instead of making iron-containing fertilizers, it is sometimes enough to acidify the earth: then it will give the plants its "stash".Nevertheless, iron-containing fertilizers exist. Apply( alas, with very little effect) the salt of iron, for example its sulfate. In experiments with water( remember this, if you want to try to do hydroponic plant cultivation!) And sand cultures, lemon-iron is a good effect. Fertilizers are also other intracomplex compounds of iron with organic substances, for example FeHEDTA( chelate of hydroxyethylenediaminoacetic acid).For indoor plants with a lack of iron in the pot, instead of fertilizer, you can put. .. a rusty nail.

Having carefully studied the list of macronutrients, it may be surprising to ask: "And where is the sulfur in the list of fertilizers?" Those who know chemistry will hardly have this question: try to count how many times the name "sulphate" or "sulphate" was mentioned in the names of mineral fertilizers. In all organic fertilizers this element is also quite a lot.