Growing a seedless tomato with the use of biostimulants

The purpose of research is to study the effectiveness of the action of biostimulants when growing tomatoes in a seedless way in irrigated conditions in the Volga delta. It was found that pre-sowing soaking of tomato seeds in a solution of the studied biostimulants increased the field germination of tomato by 6.7-11.1 % in comparison with the control, where the treatment was carried out with water. The use of ”Agrostimul”, ”Obereg”, ”Novosil” and ”Siliplant” preparations had a significant effect on the growth and development of tomato plants during the growing season. In the phase of fruit ripening, the difference in biometric indicators between the control variant and the preparations used in the experiment was: in plant height - 11.9-44.0 % (the largest percentage - ”Novosil”), plant mass - 28.4-52.7 % (the highest percent - ”Siliplant”), the number of leaves - 18.2-28.2 % (the highest percentage of ”Obereg”), the number of lateral shoots - by 59.0-86.4 % (the largest percentage - ”Obereg”, ”Siliplant”, ”Novosil”) and the number of fruits - by 25.0-40.0 % (the largest percentage is ”Obereg”). The use of biostimulants, to varying degrees, influenced the development of the main disease on tomato plants in the research area - Alternaria. During the first registration, the biological effectiveness of the preparations was 29.8-61.6 %. Before harvesting, these indicators decreased by 6.2-10.7 %. The biostimulant ”Obereg”, used for pre-sowing soaking of seeds and double spraying of vegetative tomato plants, held back the development of the disease more effectively. The preparations had a significant effect on the weight of the tomato fruit, it increased by an average of 8.1 (”Agrostimul”) - 16.1 g (”Obereg”) in relation to the control (77.3 g). The greatest increase in yield - 32.9 % was found in the variant with the use of the growth regulator ”Obereg”. The use of the studied preparations had a positive effect on the quality of the crop - the content of diseased fruits decreased significantly (by 1.5-2.4) times.