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Fertilization of apple trees with organic fertilizers “Keratin” and “Lumbreco” in Bulgaria - preliminary results

Dzhuvinov, Vasiliy; Staneva, I.; Gandev, S.; kutinkova, Hristina; Stefanova, D.; Kornov, G. and Stoeva, M. (2020) Fertilization of apple trees with organic fertilizers “Keratin” and “Lumbreco” in Bulgaria - preliminary results. In: Proceedings ECOFRUIT 2020, pp. 81-85.

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The trials were carried out at a private farm in Plovdiv region with coordinates: 42°03’ N and 24°32’ E and 184 m on the sea level. The apple trees were planted in March 2016 at a spacing of 3,50 x 1,25 m with cvs “Golden B” and “Granny Smith”/M 26 in a North-South row orientation. Training system is spindle, irrigation system – drip and soil management natural sod mulch interrow. For the stydy were used 3 trees in 8 replicates. The trunk diameter was
measured in the beginning and the end of vegetation season and the foliar analysis - in the begining of July and August. During the season 2019 were used organic fertilizers „Keratin“ and „Lumbreco“ according BBCH stages - first treatment before BBCH 60, second - after 69 and third - one after 73 stage. The dosage of „Keratin“ was 25 kg/ha and „Lumbreco“ - one liter concentrate plus 150 liters water and from this solution 10 liter per tree. According to Gorbanov S. (2018) the optimum value of N in apple leaves is 2.6%. Near the optimal content were data from July analysis at variant „Lumbreco“ following by „Keratin“.
The optimum level of P (P2O5) is 0.4% and more of this level is for „Keratin“ only. For other macro nutrient K (K2O) the optimum content is 1.6% but the data from analysis and for
variants are very variable. More than optimal level - 0.4% of Mg were in Keratin variant and for Ca optimum - 1.5% for Lumbreco. All these data demonstrated that Keratin and
Lumbreco are suitble for organic fertilizers in apple orchards.

EPrint Type:Conference paper, poster, etc.
Type of presentation:Other
Other Type:Short contribution
Agrovoc keywords:
Subjects: Soil > Soil quality
Soil > Soil quality > Soil biology
Crop husbandry > Composting and manuring
Crop husbandry > Production systems > Fruit and berries
Research affiliation: European Union > CORE Organic > CORE Organic Cofund > Domino
Deposited By: Ponzio, Dr Carlo
ID Code:42813
Deposited On:24 Nov 2021 10:24
Last Modified:24 Nov 2021 10:24
Document Language:English
Refereed:Not peer-reviewed

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