Currently, a low technological level of biological pesticides application does not provide effective plant protection from phytopathogens. In standard technology, the biological plant protection product sprayed over the soil leads to partly lost in the air as exposed to sunlight and drying out on the soil. The impact of biological plant protection product on phytopathogen into the plant debris and in the topsoil is weak. The intra-soil pulse continuous-discrete robotic system for the application of biological plant protection product was developed in the present study (Patent RU No 2720634). It allows locally to spray the chemical compounds inside the topsoil to a depth of about 0.02–0.05 m by syringe. The effectively treated soil volume diameter is about 0.10–0.15 m with a discrete application. The step between the next injections is about 0.20–0.25 m. The treated soil volume is in contact with the bottom of the plant debris. Thus, the biological plant protection product affects the soil and plant debris. Uncontrolled spread and drying out of the chemical compounds excluded. The method provides a priority development of the inoculated microbial community. The biological plant protection product effectively suppresses phytopathogens. In case of the low water content in the soil after biological product applying, an intra-soil continuous-discrete watering performed in the position of biological product injection with possible repeat. A volume of moistened soil formed at a depth of about 0.05–0.10 m. Its diameter is about 0.07–0.11 m. Soil humidification provides priority expansion of the goal microbial community into the soil. Intra-soil continuous-discrete watering provides a relatively low soil water thermodynamic potential value. This is beneficial for applied biological material development, providing water to air optimal ratio in the soil. At the same time, this reduces the harmful activity of the native hygrophilous microflora in the soil. In addition, the relatively low soil humidity reduces the soil water capillary transfer flow to the evaporation surface. The resulting amount of water necessary to maintain the inoculated microbial community priority development is small. The discrete nature of biological product initial distribution is not critical in terms of entire soil continuum coverage.

Intra-soil pulse continuous-discrete application of biological plant protection product

ACS Fall 2021

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