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The yield of crops largely depends on the content of available forms of macroelements in the soil, i.e. N, P, K, Mg, Ca and S.
A decisive role in their uptake by plants is played by soil pH, which is determined, inter alia, by the calcium content in the soil. The calcium content is mainly determined by the type of bedrock from which the soil was formed and the degree of advancement of the processes of weathering and washing in it (Juo and Barber 1969, Barber 1995, Wójcik 1998). Most often, the calcium content in the soil solution is 200 - 300 mg Ca2 + ∙ dm-3. Natural and human-related processes cause annual losses of calcium in the soil at the level of at least 140 kg CaO · ha-1. The mentioned losses of this element and the use of physiologically acidic fertilizers cause soil acidification. In soils with a pH of 5.0 and lower, the mobility of aluminum increases, which inhibits the growth of roots and has a phytotoxic effect on root hairs, causing them to die. This adversely affects the transport of water and mineral salts from the soil solution to the above-ground parts of plants. Plants grown in acidified soils are less resistant to drought, frost, and disease and pest infestation. The only effective method of soil pH regulation is the liming treatment (Kopiński et al. 2013; Krasowicz et al. 2011; Ochal 2012). The decision on the choice of fertilizing lime should be made by the farmer based on the current results of soil sample tests performed, among others, by the OSChR. It should be remembered that we always use SuperMag granulated magnesium carbonate lime for acidic soils with a low magnesium content. However, in the case of acidic soils with a high magnesium content, we use granulated carbonate lime Polcalc III Generation.
From 2020, Polcalc Sp. z o.o. introduced the bi calc + preparation to its offer. It is an innovative granulated carbonate lime enriched with hyperactive strains of Bacillus sp. The fertilizer is made of extremely ground lime flour (93-98% CaCO3), in which as much as 50% of the particles are less than 0.02 mm in diameter. The degree of grinding of the flour affects the chemical activity and the speed of dissolution in the soil environment. This raw material is processed in the developed by Polcalc sp.z o.o. innovative production and granulation technology, which enables even fertilization of the fertilizer. An absolutely innovative feature is the concentration of the concentrated fertilizer (200 × 106 JTK in each gram of bi calc + fertilizer) of Bacillus sp. Thanks to liming with bi calc + fertilizer, the process of nitrogen uptake from the air by microorganisms, both free-living and symbiotic root bacteria in legume plants, is more intensive. The addition of a new generation of humic substances to lime bi calc + as a medium for bacteria of the genus Bacillus sp. Maintains their proper multiplication level, which increases the absorption of nutrients from the soil by 20-40%. In addition, lime bi calc + stimulates the development of roots in cultivated plants, which contributes to a better uptake of nutrients and, as a result, to an increase in their yield. Granulated bi calc + carbonate lime is a completely safe fertilizer for animals, plants and soil organisms. They can be used from spring to late autumn at a dose of 500-1000 kg · ha-1, depending on the pH and type of soil. The fertilizer should not be used immediately before and after the application of mineral fertilizers containing phosphorus and nitrogen in the ammonium or amide form, as well as natural fertilizers: manure, liquid manure, slurry. The recommended interval between these treatments is at least 3-4 weeks.
The product combines the advantages of the classic Polcalc III Generation fertilizer with a rich content of active bacteria stimulating the processes of humification (humus formation) and nitrification.