Physiological indicators and disease attack as indicators of the effectiveness of fertilizer application in determinants tomatoes of late field production

Abstract

On the alluvial-meadow soil in the ISSAPP “N. Pushkarov”, an experiment has been conducted with tomatoes after pumpkin-cultivated on the same area and according to the same fertilization scheme in the previous year. The experience included a control (without fertilizer) and variants fertilized with only mineral, organic fertilizer and 50% manure + 50% mineral fertilizer. It was found that in the phase of mass ripening of the fruits in the different variants of fertilization there is a significant difference (of 25%) - in those in which organic and organic-mineral fertilization is involved at Phytophtora infestans and a regular increase in Levilula taurica attacks in the organic variant. The relationship between the leaf area of a plant and the chlorophyll content at the end of the growing season has a coefficient of determination R2 = 0.97, and between the percentage attack of the leaf mass of plants with the most widely represented fungal disease Phytophtora infestans and leaf surface index (LAI) has a coefficient of determination R2 = 0.90. Mixed fertilizer plants have the highest LAI values and specific leaf area. In experimental conditions, the applied organic fertilizer in this form is ineffective, and even has a negative impact on tomatoes compared to the untreated version.