Three-Layer Microbial Fertilizer for Peanut Continuous Cropping

The fertilizer is divided into three distinct layers: an inner layer containing active bacteria and nutrients, a middle layer providing controlled release, and an outer layer protecting the inner components. This segmentation allows the nutrient-rich inner layer to be protected while enabling gradual release through the intermediate layers, preventing both premature nutrient loss and ensuring sustained microbial activity.

The patent employs a nested structure where the inner layer (containing bacteria and nutrients) is enclosed within the middle layer (controlled release layer), which is itself enclosed within the outer layer (protective layer). This nested doll configuration ensures that the most valuable components are protected at the core while enabling controlled outward release, simultaneously maintaining microbial activity and preventing nutrient loss.

The patent utilizes the accumulated allelochemicals in continuous cropping systems not as harmful substances but as carbon and energy sources for beneficial microorganisms. The fertilizer formulation includes components that stimulate microbial populations to metabolize these allelochemicals, converting the harmful accumulation into useful energy for microbial growth and nutrient cycling, thereby maintaining high productivity while eliminating the harmful effects.

The patent introduces beneficial microorganisms as intermediary agents between the allelochemicals and the plant roots. These microorganisms act as mediators that transform the harmful allelochemicals into beneficial substances through metabolic processes, protecting the plant from autotoxicity while maintaining the continuous cropping system's productivity.

The patent creates different local environments within the fertilizer granule through its three-layer structure. The inner layer provides a high-nutrient zone for rapid microbial proliferation, the middle layer creates a controlled diffusion zone that modulates microbial growth rates, and the outer layer provides protection. This spatial differentiation of quality allows beneficial microbes to thrive while preventing conditions that would promote pathogenic organisms.

The patent changes key parameters of the microbial environment including nutrient concentration gradients, oxygen availability, and moisture content through the three-layer structure. These parameter changes create optimal conditions for beneficial microorganisms while making the environment less suitable for disease-causing organisms and pests, thereby improving soil health without increasing disease incidence.