Fig. 10From: Biochar improves the nutrient cycle in sandy-textured soils and increases crop yield: a systematic reviewThe results of randomized LASSO on the key predictors in soil total NPK response. The importance of a variable is quantified by running the LASSO model for five different model sizes (1–5 regressors). This visualization shows the variables selected in a minimum of one out of five LASSO modelsBack to article page