Productivity and quality of open field tomato after application of bio-fertilizers

H. Botеva*

Vegetable Crops Research Institute Maritsa, 32 Bezovsko shoose, 4003 Plovdiv, Bulgaria
(Manuscript received 27 April 2016; accepted for publication 31 May 2016)

Abstract. Field experiments for the effect of bio-fertilizers: Labin, Bio One, Tecamin, Agriful, Humustim and Biohumus on productivity and fruit quality of determinant tomato, variety Trapezitsa were performed on strongly leached meadow cinnamonic soil at the experimental field of the Vegetable Crops Research Institute Maritsa during the period 2008 – 2010. The fruit number per tomato plant increased up to 38.2% towards the control (without fertilization) by using bio-fertilizers Tecamin and Agriful. Similar were the results for the mass of fruits per plant, where the increase was up to 33.3% towards the control. After mineral fertilization the total tomato yield is the highest on average for the period of study. An increase of the yield in tomato with reduced mineral fertilization is established after application of bio-fertilizers 12.1% on average from 7.8% /after fertilization with Labin/ to 18.3% /after fertilization with Tecamin/ towards the control. A positive effect by fertilization with Tecamin (38.8%) and Agriful (36.3%) is established on early production. In mineral fertilization this index is lower (23.7%). Bio-fertilizers Tecamin and Agriful have a positive effect on the content of vitamin C and dry matter.


Resistance of Bulgarian tomato varieties to the races of Xanthomonas vesicatoria

Abstract. Bacterial spot of tomato caused by Xanthomonas vesicatoria is an economically important disease that reduces the quality and the production yield. Races Т1, Т2 and Т3 have been differentiated in the natural population of X. vesicatoria. In this research 33 tomato varieties from the Bulgarian selection have been tested for their resistance towards X. vesicatoria. The varieties are characterized by different degrees of resistance. No immune and complex resistance has been found. The early and the mid-early indeterminate varieties are sensitive to the cause of bacterial spot. Variety IZK Alia of cherry type is moderately sensitive to races T1 and T3 but sensitive to race T2. Varieties Plovdivska karotina and BG Fantazia are resistant to race T1 and moderately sensitive to races T2 and T3. Varieties Nikolina F1 and Topaz are moderately sensitive to the three races. Bononiya and Venera are highly sensitive. In order to obtain genotypes with complex resistance to the races of X. vesicatoria further investigations should include: searching for new sources of resistance, conducting a selective breeding and increasing plant resistance sustainability.