A method for estimating topdressing amounts in an integrated water–fertilizer system for pear orchards

Abstract

The present invention discloses a method for estimating topdressing amounts in an integrated water–fertilizer system for pear orchards, belonging to the technical field of data analysis, wherein by introducing multi-round topdressing micro-perturbation response degradation analysis, path structure overlap evaluation, and root-zone salinity drift trend identification mechanisms, a dynamic assessment of implicit structural costs during long-term operation of the integrated water–fertilizer system is achieved, overcoming the shortcomings of existing methods that rely only on single-state-based local optimal estimation and have difficulty identifying slow-variable evolution problems such as channel repeated loading and salt migration, thereby shifting the topdressing strategy from an instantaneous feedback orientation to a structural stability orientation, enabling proactive intervention before structural imbalance becomes explicitly exposed, and effectively avoiding problems such as reduced water–fertilizer efficiency, weakened regulation capability, and increased late-stage remediation costs.