Summary
Intensification under technical and economic constraints has driven widespread soil fertility decline in Paraguay. In this context, whether no till with crop diversification alone can maintain fertility under low-input conditions remains uncertain. Our objective was to evaluate how contrasting agricultural systems defined by types of soil tillage and crop sequence affect soil nutrient stocks under long-term low-input management. We measured stocks of macro and micronutrients to 30 cm and assessed associations between pH and nutrients. Diversified no till helped maintain higher stocks of total N (+15%) and of available P (+40%), exchangeable K (+27%), Ca (+72%) and Mg (+43%) relative to conventional tillage. In contrast, extractable concentrations of redox sensitive micronutrients (Cu, Fe,
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