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Phosphorus-induced zinc deficiency in wheat pot-grown on noncalcareous and calcareous soils of different properties
- Sacristán, Daniel, González–Guzmán, Adrian, Barrón, Vidal, Torrent, José, Del Campillo, María C.
- Archiv für Acker- und Pflanzenbau und Bodenkunde 2019 v.65 no.2 pp. 208-223
- Triticum turgidum subsp. durum, bioavailability, calcareous soils, calcite, durum wheat, grain yield, iron oxides, nutrient deficiencies, phosphates, phosphorus, zinc
- High levels of phosphorus (P) often induce zinc (Zn) deficiency in plants grown on Zn-poor soils. We investigated P-induced Zn deficiency in durum wheat (Triticum durum L. ‘Carpio’) grown on 16 noncalcareous and 31 calcareous soils differing in levels of available (Olsen) P and available (diethylenetriaminepentaacetic acid (DTPA)-extractable) Zn using micropots. A completely randomized factorial design with two levels of P (0 and 40 mg P kg⁻¹ soil) and Zn (0 and 3 mg Zn kg⁻¹ soil), i.e. four treatments (‘control’, + P, + Zn, and + PZn), were used. Grain yield of control plants depended mainly on the Olsen P level. Phosphorus had a negative effect on yield in 6 soils with Olsen P/ZnDTPA > 25, and Zn a positive one in 5 soils with Olsen P/ZnDTPA > 50; and the + PZn treatment generally resulted in the highest yield. Grain Zn concentration of control plants was negatively correlated with growth and Olsen P. Calcareous soils were less sensitive to P-induced Zn deficiency than noncalcareous soils because phosphate is sorbed by calcite rather than being co-adsorbed with Zn on the Fe oxides. Co-application of P and Zn to soil at low and application of Zn at high Olsen P ensured both maximum yield and grain Zn bioavailability.