Effect of moisture stress and foliar application of Zargreen organic liquid fertilizer on tomato growth and yield

The present research was conducted to investigate the effect of foliar application of Zargreen organic liquid fertilizer on the growth and chemical composition of tomatoes under drought stress in greenhouse conditions in the Faculty of Agriculture of Shiraz University on May 2022. Treatments consisted of four levels of foliar application of Zargreen amino acid fertilizer (with concentrations of 0, 2.5, 5, and 7.5 L/1000L), and three soil moisture levels (field capacity (without stress), 75 and 50% of field capacity, FC). During the growing season three times; 1.5 months (at the end of vegetative growth and beginning of flowering), 2.5 months (at the stage of fruit development), and 3 months (at the stage of fruit ripening) after planting, Zargreen organic liquid fertilizer solutions were used with the mentioned concentrations for foliar spraying. The interaction effect of Zargreen organic fertilizer and moisture levels showed that the highest greenness index was observed with the highest level of soil moisture stress and the highest level of applied organic fertilizer. Application of 2.5, 5, and 7.5 L/1000L of Zargeen fertilizer increased the mean value of plant height by 8, 9, and 14%, respectively, compared to the control. The lowest shoot fresh weight was obtained without application of the organic fertilizer at the highest level of applied moisture stress. While at the same stress level, the highest shoot fresh weight was observed with the addition of 7.5 L/1000L of the organic fertilizer. The highest shoot zinc and copper concentrations were obtained in the plants grown at the highest moisture stress and the highest level of organic fertilizer application. It can be concluded that adding organic compounds improves the plant's tolerance to environmental stresses by modifying the physiological processes of the plant.