Foliar fertilization in fruit cultivation
In the fruit cultivation the foliar fertilization is since decades already a fixed component in the general complex of the nutrition. The foliar fertilization is already used in case of visible deficiency symptoms (e.g., with manganese, iron, magnesium etc), and also with latent (not visible) lack.
The leaf analysis has proved itself as an aid in order to recognize a latent nutrient lack.
Even if the soil is supplied optimally with nutrients, the adequate care of the fruit-tree with major-, secondary- and trace elements is not always verified . Many factors limit the availability and admission from the soil, e.g., high pH values with trace elements and low pH values with major- and secondary elements, aridity,
cold weather, soil compressions and / or waterlogging, competition by greenings and antagonisms (interactions) between the elements (e.g. too much of potassium limits the availability and admission of magnesium and calcium).
Special nutrient demands with pip fruits
In the range of the plants nutrition the apple has more claims than the pear. With the apple elements like nitrogen (to the achievement of a high yield), potassium and phosphorus (for a optimal coloring with good fruit quality), the creation of a positive potassium-calcium relation for solid fruits and a balanced care with magnesium and manganese plays an important role for the avoidance of leaf spots. However, the pear is more susceptible for iron chloroses.
Leaf spots and premature leaf fall
Some sorts, particularly Gold Delicious, Jonagold, Elstar, Gala and Cox tend to nutritional-physiological conditional leaf nectrosis and premature leaf fall. The reasons for this are, among other things, an undersupply with manganese and magnesium. The combination of Lebosol®-Magnesium 400 SC with Lebosol®-Manganese 500 SC eases the symptoms and reduces the premature leaf fall.
Flourish quality, fruit setting, skin quality
Boron in combination with calcium (in Lebosol®-Robustus SC), zinc (Lebosol®-Zinc 700 SC) and amino acids (Aminosol®) have a positive influence on pollen tube growth, flourish, fruit asetting and diminish the russeting. In this combination they can brought out before the flourish or after the harvest. In addition, the application of Lebosol®-Robustus SC before flourish leads to a better coloration of the apples. In Addition boron and zinc promote, the calcium admission.
Phosphorus and potassium have a positive effect on the coloration of the fruit, so that the red opaque color is promoted with several foliar fertilizations with Lebosol®-PK-Max from the time of fruit setting. At the same moment phosphorus contributes to a better fruit firmness and less cold and internal breakdown.Manganese is responsible for the green background color, so it can be improved with Lebosol®-Mangan GOLD SC in two-color varieties.
Particularly pears lightly (easily) incline to iron chloroses. Iron deficiency appears by yellowness of the youngest leaves with dark veins. Here the early and regular foliar fertilization with Lebosol®-Eisen-Citrat GOLD puts things right.