Foliar fertilization in fruit-growing
Even if the soil is supplied optimally with nutrients, the need-based supply of the berry bush with major, secondary- and trace elements is not always safe.
Many factors limit the availability and admission from the soil, e.g. high pH values with trace elements and low pH values with main elements and secondary elements, aridity, cold weather, soil compressions and/or waterlogging, competitions by greenings and antagonisms (reciprocal effects) between the elements (e.g. a too much of potassium limits the availability and admission of magnesium and calcium).
Special nutrient demands of berries
The cultivation of berries has increased strongly over the last few years. However, the limited storability of the fruits represents a disadvantage. Therefore the raspberries cultivation is conduct under foil to protect the sensitive, very soft fruits against weather influences.
The claim in location, soil and availability of specific nutrients varies according to the kind of berries. All berries, but particularly currants, are very sensitive to chloride, while bilberries require, e.g., a low pH value in soil. However, the soil pH value takes influence on the nutrient availability: With a low pH value there is often a major element deficiency, and with a high pH value, there is often a trace element deficiency. Here, badly available iron and / or manganese lead to leaf yellowing (chloroses).
Calcium-deficiency in blueberries
Fruit stability, storability
Low calcium contents in the fruit stand for bad fruit quality and decreasing pulp firmness. Treatments with the chloride-free product Lebosol®-Calcium-Forte SC (calcium formiate as a particularly compatible calcium source) raise the calcium content in the fruit and thereby improve the firmness and most of all the storability. Lebosol®-Calcium-Forte SC stands for an additional care with manganese and zinc.
Iron chlorosesBerries lightly incline to iron chloroses. Iron deficiency appears by yellowness of the youngest leaves with dark veins. Near culture-technical measures (soil structure, hydrologic balance, greenings, pH value etc) the possibility exists to improve the foliar iron supply. Here the early and regular foliar fertilization with Lebosol®-Eisen-Citrat GOLD puts things right. Lebosol®-Eisen-Citrat GOLD is a particularly compatible iron foliar fertilizer,therefore, this combination presents itself as a foliar fertilizer. To improve the distribution of the iron on and in the leaf, amino acids are contained in the product, too.
Iron-deficiency in goosberries
Boron-deficiency in blueberries
Blossom, fruit setting, yield stabilization
The nutrition with amino acids together with the auxine effect of certain amino acids is particularly important for fruit setting and flower bud quality. With the application of Aminosol® before blossom fruit attempt and fruit growth improve and the coulure of e.g. currants is reduced. For the improvement of fruit setting, where boron and zinc play an important role, Lebosol®-Robustus SC (boron + calcium) and Lebosol®-Zink 700 SC are additionally applied before blossom.