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Abstract:The subject of present comparative study in the region of the NFMW Plovdiv, Bulgaria

The purpose of this study is to determine the impact of controlled permanent water deficiency and three levels of fertilization on earliness and total yield of tomatoes, greenhouse production using different mathematical approaches. In order to evaluate the morphological manifestations, the early harvest and the total yield under the influence of different irrigation and nutritional regimes, a tomatoes variety "Vitelio" was used. The irrigation is done with a drip irrigation system. Against the background of the same fertilizing rates in the variants with different irrigation norms there is a decrease in the early stage with an increase of the irrigation norms. A high correlation between plant height and total yield, with correlation coefficient (r = 0.899) and between sheet count and total yield r = 0.824 was found. There was a negative correlation between the first and third harvests and the total yield, respectively with correlation coefficients r = -0.724 and r = -0.704. The nature of the linear relationship between plant height and total yield is determined by the coefficient R2 = 0.8. Based on a two-factor analysis, it was found that irrigation regime had a dominant influence on the two parameters considered: height and yield, which was statistically proven with a very high degree of confidence (p ≤ 0.001).

Abstract. In recent years, there has been a significant increase in the number of cotton bollworm (Helicoverpa armigera Hb., 1808) due to changing climatic conditions, the covert life cycle of caterpillars and the formation of resistance in the populations to some of the commonly used insecticides. Experiments with tomato variety Pink Rock F1 grown in greenhouses to determine the biological activity of some products for plant protection against cotton bollworm were conducted at the “Maritsa” Vegetable Crops Research Institute – Plovdiv. The bioproducts Rapax, Dipel 2X, Helicovex, Neem Azal T/S and Sineis 480 SC have good effectiveness >77% towards cotton bollworm in the interval 7-14 days after treatment. The tested insecticides Lanate 25 WP, Coragen 20 SC 200 ml/ha, Exalt 25 SC, Voliam Targo 063 SC, Ampligo 150 ZC and Affirm 095 SG show very good biological activity (E>84%) 7-14 days after treatment.

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