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Soft fruit

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Foliar fertilization in fruit-growing

The foliar fertilization with micro-nutrients (e.g. manganese, iron, boron, magnesium) is well established since many years. Foliar fertilizers can be used preventive as integrated part of the fertilizer strategy or if it comes to an undersupply with nutrients and visible symptoms.

 The leaf analysis can help to analyze and recognize the availability for each element.

 

Nutrient availability

Many parameters in the soil can limit the availability of nutrients – high pH-values can block micro-nutrients, low pH-values can block macro-nutrients. But also dry and cold weather conditions, soil texture and some nutrient antagonism (e.g. oversupply with potassium vs. magnesium and calcium) can lead to a deficiency of nutrients.

Specific requirements for soft fruits

Cultivation of soft fruits has strongly grown over the last few years. All bush berries, especially currants, are very sensitive to chloride. Blueberries are requesting a low pH value of soil. The problem is, that the soil pH value is influencing the nutrient availability – low pH values can lead to macro nutrient deficiency and high pH-values can limit the availability for micro nutrients. Especially a deficiency with iron and / or manganese will cause yellowing of the leaves (chloroses).

Calcium-deficiency in blueberries

Fruit quality and shelf life

Lebosol®-Calcium-Forte SC, free of chloride, will improve the calcium concentration in the fruit and enhance quality and shelf life. Besides that, Lebosol®-Calcium-Forte SC is containing the micro nutrients manganese and zinc as well.

Iron chloroses

Soft fruits are susceptible to iron chloroses. An iron deficiency will be visible by yellowness of the youngest leaves with dark veins. Different paramters, e.g. soil structure, moisture and pH value will influence the iron availability. The foliar fertilizer Lebosol®-Eisen-Citrat GOLD – containing iron and manganese - will enhance the iron and manganese supply and availability. For better spreading and uptake, the product is containing amino acids as well.

Iron-deficiency in goosberries

Boron-deficiency in blueberries

Flowering, fruit setting & yield

The application of Aminosol® before the flowering will enhance fruit setting and fruit growth because of the combination of amino acids and the auxine effect.

Boron in combination with calcium (Lebosol®-Robustus SC) and zinc (Lebosol®-Zinc 700 SC) are crucial for the pollen tube growth, flowering and the fruit setting. These products should be applied before the flowering.

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
Increase in fruit firmness, storage stability and resilience 3 - 4 times 4 - 6 l/ha Lebosol®-Calcium-Forte SC Beginning of flowering to harvesting
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
Depositing of reserve substances, flower bud development, winter hardiness, flower quality 2 times 2 - 3 l/ha Aminosol® +
2 times 0,5 l/ha Lebosol®-Zink 700 SC +
2 times 1 l/ha Lebosol®-AqueBor 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