# Covariates in sample planning optimization for digital soil fertility mapping in agricultural areas

> Research article (Geoderma, 2022) · cited 19× · AI/ML

**Wikidata**: [openalex:W4309340246](https://www.wikidata.org/wiki/openalex:W4309340246)  
**Source**: https://4ort.xyz/entity/covariates-in-sample-planning-optimization-for-digital-soil-fertility-mapping-in-agricultural-areas