How silicon affects phosphate availability and carbon turnover in soils?
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Answer:
Phosphorus (P) is a key element for life's structure and metabolic pathways. Phosphorus is one of the most limiting elements for primary production and yield of crop plants, resulting in the use of large amounts of P fertilizers in agriculture at the global scale.
Further analysis indicated that Si interferes with the Fe-phases present in the soil and possibly influences phosphate binding by these Fe-phases. The aim of the proposed study is to disentangle whether and to which extend (i) increased Si availability will lead to mobilization of P from mineral binding sites and therefore increases P availability, (ii) Si has higher affinity for binding sites of soil mineral as compared to P and C, (iii) higher Si availability will enhance the mineralization of organic matter due to increasing P availability resulting in mobilization of C (i.e. increased DOC) from the binding sites, and (iv) Si will interfere with P availability at the soil pH range from 4 to 8. Understanding how Si interferes with P availability is a potential tool to reduce the agricultural need for P fertilizer for optimal P supply.
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