COMPARISON OF ECONOMIC RESULTS BETWEEN SEPARATE GROWING OF WALNUT AND MIXED GROWING WALNUT AND PEACH
Trees in traditional walnut orchards enter the period of full production capacity 10-12 years after being planted in Bulgaria - that is why payback period is slower compared to the payback period of other fruit species. Therefore, ways for more effective cultivation are researched. One of those approaches is growing walnut in mixed cropping. For this purpose in the period 2003-2010 in the experimental field of the Fruit Growing Institute Plovdiv a trial was conducted. Peach was selected for an intercrop because it starts fruiting early and has short life, which would allow the peach trees to have naturally died and to be uprooted before walnuts begin fruiting. The aim of the study was to compare and evaluate the economic results of separate cultivation of Bulgarian walnut cultivars Izvor 10, Sheinovo and Silistrenski, grafted on rootstock (Juglans regia L.) at 10x10 m planting distance with mixed growing of walnut and peach. The variant with mixed growing was planted with the same walnut varieties at the same distance and intercrop peach was planted between walnut rows at 5х3 m. The peach is cultivar Glohaven, grafted on rootstock (Persica vulgaris Mill). The results showed that mixed cropping of walnut with peach is economically more profitable. This approach of cultivating provides producers with additional income necessary for the normal output of the manufacturing process in the years in which walnut has not started to generate revenue and allows rapid payback of the plantation. The year of positive net cash flow in case of separate cultivation of walnut is the 8th growing year, while in the mixed growing of walnuts and peaches it happens on the 3rd growing year. Net present value of mixed plantation exceeded by 18 to 22 times such received from separately grown walnuts (for 7th and 8th growing season).
Manolova, V. and Gandev, S. (2013). COMPARISON OF ECONOMIC RESULTS BETWEEN SEPARATE GROWING OF WALNUT AND MIXED GROWING WALNUT AND PEACH. Acta Hortic. 981, 749-754
mixed plantation, intercropping, additional costs, return, profitable