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13. Interaction between some leaf fertilizers and the density of Colorado potato beetle eggplant crops (Leptinotarsa decemlineata Say)
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14. Biological behaviour of different varieties of tomatoes grown in glasshouses. I. Phenological and morphological characteristics.
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15. Biological behaviour of different varieties of tomatoes grown in glasshouses. II. Economic productivity.
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17. Effect of different fertilizing systems on productivity and N, P & K taken up from wheat variety Prelom
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18. Effect of different fertilizing systems on productivity and N, P & K taken up from brewing barley variety Kamenica
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19. Cultural informative route „Orpheus and orphism in the Rodopi Mountains“
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