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Soft fruit

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Foliar fertilization in fruit-growing

In the fruit-growing the foliar fertilization is a fixed component in the general complex of the nutrition for decades. The foliar fertilization is first of all choosed, if already visible deficiency symptoms have appeared (e.g., with manganese, iron, boron, but also with magnesium etc).
But also a latent (more visibly) lack should be repaired. This can be perceived with a leaf analysis.
 

Nutrient availability

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 chloroses

Berries 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.

Main recommendations

Aim/Problem Recommendation Time
Improvement in effectiveness and tolerability of soil-applied herbicides 0,2 - 0,6 l/ha Herbosol® (Increase to 0.6 l/ha on light soils with a low humus content; reduce to 0.2 l/ha for heavy soils with a high humus content.) With soil-applied herbicides
Improvement in effectiveness and tolerability of plant protection products and calcium fertilisers 150 - 300 ml Aminosol® (per 100 l spray water) With plant protection products and calcium fertilisers
Increasing stress tolerance 2 - 3 l/ha Aminosol® In the event of stress at the site
Initial development, vitality, energy and water balance, N efficiency 2 times 6 - 8 l/ha Lebosol®-PK-Max Start of vegetation
Prevention and alleviation of iron chlorosis, improvement in water transport, leaf quality 2 - 5 times 3 - 7 l/ha Lebosol®-Eisen-Citrat GOLD Start of vegetation
Improvement in flowering quality, fruit set, calcium transport, fruit quality 2 times 2 l/ha Lebosol®-Robustus SC +
2 times 0,25 l/ha Lebosol®-Zink 700 SC
Beginning of shoot development to beginning of flowering
Raspberries, blackberries: Boosting of resistance to illness 2 - 5 times 2 - 4 l/ha Lebosol®-Kalium-Plus Beginning of shoot development to harvesting
Vitalisation, improvement in the photosynthesis rate, resilience, internal quality 2 - 3 times 4 - 6 l/ha VITALoSol® GOLD SC Beginning of shoot development to harvesting
Boosting of the restistance of the flowers to frost, yield 1 - 2 times 2 l/ha Aminosol® +
1 - 2 times 1 l/ha Lebosol®-Robustus SC +
1 - 2 times 5 l/ha Lebosol®-Kalium 450
First flower buds visible before frost
Strengthening of inflorescences, yield 2 - 3 times 2 - 3 l/ha Phytoamin® Beginning of flowering to harvesting
To prevent premature leaf drop; increased vitality, leaf quality, photosynthesis rate 2 - 3 times 3 - 5 l/ha Lebosol®-MagSOFT SC Beginning of flowering to harvesting
Improvement in leaf quality, photosynthesis rate, N efficiency 2 - 4 times 1 l/ha Lebosol®-Mangan GOLD SC Beginning of flowering to harvesting
Increase in fruit firmness, storage stability and resilience 3 - 4 times 4 - 6 l/ha Lebosol®-Calcium-Forte SC Beginning of flowering to harvesting
Depositing of reserve substances, flower bud development, winter hardiness, flower quality 2 times 1 l/ha Lebosol®-AqueBor SC +
2 times 2 - 3 l/ha Aminosol® +
2 times 0,5 l/ha Lebosol®-Zink 700 SC
After harvesting
Treated crops are avoided by mice 3 - 5 times 5 l/ha Lebosol®-Schwefel 800 OD When required
Treated crops are avoided by furred game 2 l Aminosol® (with 2 l water (2 - 3 days beforhand), quantity for 1 ha) When required