Heterogeneous co-supplies of phosphorus, sulfur and carbon enhance phosphorus availability by improving rhizosphere processes in a calcareous soil

Summary

This 2024 study investigates how heterogeneous co-application of phosphorus, sulphur and carbon sources enhances phosphorus availability in calcareous soils—a significant challenge in such soils where phosphorus is often bound and unavailable to plants. The authors propose that these three inputs work synergistically to improve rhizosphere processes, suggesting that combined nutrient and organic matter strategies may be more effective than single-nutrient approaches in high-pH soils. The findings contribute to understanding of nutrient cycling and soil chemistry in calcareous conditions, which are widespread in Mediterranean and semi-arid regions.

UK applicability

The UK has limited calcareous soil extent (primarily chalk and limestone areas in south-central England), so direct applicability is geographically restricted. However, the mechanistic insights on phosphorus availability and rhizosphere enhancement could inform nutrient management strategies in affected regions and may have broader relevance to phosphorus efficiency in challenging soil types.

Key measures

Phosphorus availability (likely measured via extraction or plant uptake); rhizosphere pH, organic acid concentration, or microbial activity; sulphur and carbon dynamics in soil

Outcomes reported

The study examined how combined applications of phosphorus, sulphur and carbon affect phosphorus availability and rhizosphere processes in calcareous soil. The research measured changes in soil phosphorus bioavailability and associated microbial or chemical rhizosphere mechanisms.

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