Crop contribution citrus fruits
Even if the soil is supplied optimally with nutrients, the need-based supply of the tree with major-, secondary- and trace elements is not always guaranteed. 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, soil compressions, competitions by greenings, and antagonisms (reciprocal effects) between the elements.
Special nutrient demands
One of the most frequent lack symptoms on the leaves of citrus fruits are 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 put things right.
Fruit quality/improvement of storage stability
Concerning the fruit firmness care has to be taken on the K-/Ca-relation of the fruit: an oversupply with potassium restrains the admission of calcium and that leads to an undersupply with calcium.
Even a good availability of calcium in soil is, on the basis of the peculiarities of the calcium transportation in the plant, no guarantee for a sufficient supply of the fruits. So that repeated calcium sprayings with Lebosol®-Calcium Forte SC (calcium formiate as a particularly compatible calcium source) are necessary. Lebosol®-Calcium Forte SC ensures an additional care with manganese and zinc.
Phosphorus and potassium have a positive effect on the coloration of the fruit, so that with several foliar fertilizations with Lebosol®-PK-Max after fruit setting the body color is promoted. At the same time phosphorus contributes to a better fruit firmness.
Leaf spots and premature leaf fall
Some sorts incline to nutritional-physiological conditional leaf necroses and premature leaf fall. The causes are, among other things, an undersupply with manganese and magnesium. The combination of Lebosol®-Magnesium 400 SC with Lebosol®-Mangan 500 SC alleviates the symptoms and reduces the premature leaf fall.
Molybdenum lack in citrus fruits is known as “Yellow spot” (“Yellow blotches”). In spring glassy, roundish to oval spots appear between the vains which later will assume a golden yellow coloring on the leaf top. In case of a severe shortage the necrosis can spread out up to the leaf border which is curling up. Here an early and regular foliar fertilization with Lebosol®-Molybdän prevents the formation of “Yellow spot”.
Flourish quality, fruit setting
Boron in combination with Calcium (in Lebosol®-Robustus SC), zinc (Lebosol®-Zink 700 SC) and amino acids (Aminosol®) have a positive influence on flourish, pollen tube growth and fruit setting. They can be brought out in this combination before the flourish or after the harvest to protect an optimal care. Moreover the application of boron and zinc promotes the calcium uptake.