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Response of white mustard (Sinapis alba) and the soil microbial biomass to P and Zn addition in a greenhouse pot experiment
- Khan, Khalid Saifullah, Joergensen, Rainer Georg
- Zeitschrift für Pflanzenernährung und Bodenkunde 2015 v.178 no.6 pp. 834-840
- Sinapis alba subsp. alba, crops, greenhouses, microbial biomass, nutrient deficiencies, phosphorus, silt, soil, soil microorganisms, zinc
- A 45‐d pot experiment was carried out to investigate the response of white mustard and the soil microbial biomass after Zn and P addition to a P deficient silt loam. The underlying hypothesis was that P application reduces the Zn availability to crops and microbial biomass. White mustard was supplied with different levels of P (0, 50, and 100 µg g⁻¹ soil) and Zn (0, 10, and 20 µg g⁻¹ soil). Amendments of P generally reduced extractable Zn, shoot Zn and soil microbial biomass Zn. Amendments of P generally decreased the microbial biomass C/P ratio. At 20 µg Zn g⁻¹ soil, a negative effect on the microbial biomass C/P ratio was observed, suggesting that high contents of extractable Zn have a negative impact on the microbial P uptake. However, the minimum Zn requirements of soil microorganisms and the consequences of microbial Zn deficiency for soil microbiological processes are completely unknown.