The content of heavy metals in the vegetative mass of pumpkin plants when applied by the sprinkling method
Obtaining high yields of agricultural plants with their proper quality on soils contaminated with heavy metals is of the utmost importance for modern farmers of the Kuban. The purpose of the research is to study the accumulation of heavy metals in the vegetative organs of pumpkin plants, depending on the properties of the soil and the physical and chemical properties of pollutants. The tasks are to determine the influence of the physical and chemical properties of the soil on the accumulation of heavy metals in the vegetative part of the studied plants; to determine the influence of the chemical properties of heavy metals on their accumulation in the vegetative part of the studied plants. By the method of field research, the accumulation of heavy metals in the vegetative mass of pumpkin, Mramornaya variety, when applied by sprinkling method, depending on the physico-chemical properties of the soil, has been studied. Heavy metals in plants are determined by the AAS method. It has been found that when growing the studied plant on a rain-fed plot of meadow-chernozem soil, copper and cadmium accumulated in the foliage less than in the soil of rice check, respectively 2.2 and 4.9 times. The studied heavy metals had a depressing effect on the biometric parameters of the pumpkin. On the experimental plots of meadow-chernozem soil of the bogarny plot and the soil of the rice check, there was a decrease in the studied biometric parameters compared with the control. Moreover, on the meadow-chernozem soil of the rice check, this decrease was more intense. Under the influence of heavy metals and soil properties, the yield of the studied plant decreased: for the first variant it was 24.0 t/ha, for the second - 8.2 t/ha. When growing Mramornaya pumpkin variety on meadow-chernozem soil, a rain-fed area of cadmium accumulated more than copper by 16.0 times, on meadow-chernozem soil of rice check, this difference was 47.0 times. One of the reasons for this difference in the accumulation of heavy metals is their physiological role for the plant under study.