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Stone fruit

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Foliar fertilization in fruit-growing

The foliar fertilization with micro-nutrients (e.g. manganese, iron, magnesium) is well established since many years. The foliar fertilization with micro-nutrients (e.g. manganese, iron, magnesium) is well- stablishes 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 stone-fruits

Stone fruits are easier to fertilize and less demanding. Most important are the macro-nutrients nitrogen for high yields and potassium/phosphorus to stimulating the fruit quality. The appropriate potassium-calcium-relation will enhance solid fruits with skin stability. In addition, the micro-nutrients zinc, iron and manganese are important for growing stone-fruits.

Stabile yields

The nutrition with amino acids in combination with the auxin effect of certain amino acids is particularly important for fruit setting and flower bud quality. The multiple application of Aminosol®  from beginning blossom will enhance fruit setting and the fruit growth. In addition, leaf and fruit symptoms in plums will be reduced and the quality improved.

Iron-deficiency cherries

Iron-deficiency plums

Iron chloroses

Cherries 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.

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.

 

Post-harvest treatment

Boron and zinc are mandatory for flowering, fruit setting and leaf development. At this period, trees can’t take up enough nutrients from the soil. For best fertilization and nutrition, we recommend a post-harvest treatment with Lebosol®-Bor and Lebosol®-Zink 700 SC. 

These products can be combined with the application of urea and Aminosol® to enhance the storage of reserve substances for the next growing period.

Trial result Aminosol® in cherries 1999

Main recommendations

Aim/Problem Recommendation Time
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
Improvement in flowering quality, fruit set, calcium transport, fruit quality 2 times 2 l/ha Lebosol®-Robustus SC +
2 times 0,5 l/ha Lebosol®-Zink 700 SC
Beginning of flowering to fruit set
Strengthening of inflorescences, yield 2 - 3 times 2 - 3 l/ha Phytoamin® Beginning of flowering to fruit set
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
Beginning of flowering before frost
Promotion of fruit set, fruit growth, less cherry run off 3 times 5 - 7,5 l/ha Aminosol® Full bloom at intervals of 8 days
To combat leaf and fruit symptoms caused by sharka 3 times 5 - 7,5 l/ha Aminosol® (without plant protection products) Full bloom at intervals of 30 days
Increasing stress tolerance 2 - 3 l/ha Aminosol® End of flowering to harvesting, at stressed sites
Increase in fruit firmness, storage stability and resilience 4 - 6 times 5 - 8 l/ha Lebosol®-Calcium-Forte SC End of flowering to harvesting
Improvement in skin quality, calcium transport, flower bud quality 1 - 2 times 2 l/ha Lebosol®-Robustus SC +
1 - 2 times 0,25 l/ha Lebosol®-Zink 700 SC
End of flowering to harvesting
Vitalisation, improvement in the photosynthesis rate and resilience 2 - 3 times 4 - 6 l/ha VITALoSol® GOLD SC End of flowering to harvesting
To prevent premature leaf drop; increased vitality, leaf quality, photosynthesis rate 2 - 3 times 3 - 5 l/ha Lebosol®-Magnesium 400 SC Fruit set to harvesting
Improvement in leaf quality, photosynthesis rate, N efficiency 2 - 3 times 1 l/ha Lebosol®-Mangan GOLD SC Fruit set to harvesting
Prevention and alleviation of iron chlorosis, improvement in water transport, leaf quality 2 - 5 times 3 - 7 l/ha Lebosol®-Eisen-Citrat GOLD Fruit set to harvesting
Promotion of fruit firmness, fruit size, sugar content 2 times 5 l/ha Lebosol®-Kalium 450or2 times 6 - 8 l/ha Lebosol®-PK-Max Fruit set to harvesting
Depositing of reserve substances, regeneration, 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 furred game 2 l Aminosol® (With 2 l water 2 - 3 days beforehand (quantity for 1 ha)) When required