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| Authors: | K. Dragoiski, H. Dinkova, B. Mihovska |
| Keywords: | plum, PPV control, nutrients, sheep folding |
Abstract:
Between 1985 and 2000 the PPV infected trees of the ‘Kyustendilska sinya’ variety grown in the region of RIMSA, Troyan, were monitored for their response to different nutritional regimes as follows:
- Reference – standard technology for plum fruit production based on annual dressing with saltpetre plus full organic-and-mineral nutrient supply given as a single dressing every third year consisting of 3 tonnes of manure, 40 kg of P2O5 and 40 kg of K2O;
- Reserve manure application in the soil layer occupied by the roots – filling trenches with an average amount of 70 kg/m or 110-120 tonnes of manure per hectare;
- Soil surface organic nutrition through sheep folding in plum orchards for different time periods.
With increasing the rate of manure application the damage on plum fruit produce was found to decrease as compared to the traditional management system.
The highest fruit yield of 100 kg per tree, on average, was obtained in the third variant at 100-hour stay of a sheep per m2. Another feature of this variant was the 55%-increase of chlorophyll in the leaves compared to the reference and disguising of the plum pox symptoms.
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