TY - JOUR
T1 - Quantifying phosphorus fertilizer distribution and the contribution of fertilizer and soil legacy phosphorus to phosphorus uptake by maize – A 32P-labelling study
AU - Zheng, Dongfang
AU - Yuan, Huimin
AU - Yang, Guojiang
AU - Feng, Gu
AU - Rengel, Zed
AU - Shen, Jianbo
PY - 2023/9
Y1 - 2023/9
N2 - The availability of phosphorus (P) fertilizer applied to soil can diminish rapidly because of the complex soil P immobilization processes. However, the quantitative distribution of fertilizer P in the soil P fractions is not fully understood. Here, two experiments were conducted in a greenhouse using 32P-labelled KH2PO4 to (i) quantify the distribution of P fertilizer in soil fractions, microorganisms and maize shoots grown in contrasting soils; (ii) characterize the effect of planting maize on soil P fractions and (iii) determine the amount of plant P derived from fertilizer vs. soil. Depending on the soil type, 74.1%–84.1% of the labelled P was retained in the soil, 11.4%–14.5% was found in maize shoots and 0.7%–4.5% was present in microorganisms. Distribution of applied P in the soil P fractions was dependent on soil type, with most P present as NaOH-Pi and residual-P in the Red soil, and as HCl-P in the Fluvo-aquic soil. Root-mediated processes were involved in mobilisation of residual-P in all three soils, with significant depletion of NaOH-Pi in the Red soil, NaOH-Pi and HCl-P in the Black soil, and HCl-P in the Fluvo-aquic soil. The plant P derived from fertilizer and soil increased with increasing P addition rates in all three soils. In the soils with low-P availability, fertilizer contributed more P to plants than soil, whereas in the initially high-P soil, the opposite occurred. In conclusion, the partitioning of fertilizer P to various soil P fractions is dependent on the soil type, and the contribution of P derived from fertilizer to maize P uptake was related inversely to the soil legacy P.
AB - The availability of phosphorus (P) fertilizer applied to soil can diminish rapidly because of the complex soil P immobilization processes. However, the quantitative distribution of fertilizer P in the soil P fractions is not fully understood. Here, two experiments were conducted in a greenhouse using 32P-labelled KH2PO4 to (i) quantify the distribution of P fertilizer in soil fractions, microorganisms and maize shoots grown in contrasting soils; (ii) characterize the effect of planting maize on soil P fractions and (iii) determine the amount of plant P derived from fertilizer vs. soil. Depending on the soil type, 74.1%–84.1% of the labelled P was retained in the soil, 11.4%–14.5% was found in maize shoots and 0.7%–4.5% was present in microorganisms. Distribution of applied P in the soil P fractions was dependent on soil type, with most P present as NaOH-Pi and residual-P in the Red soil, and as HCl-P in the Fluvo-aquic soil. Root-mediated processes were involved in mobilisation of residual-P in all three soils, with significant depletion of NaOH-Pi in the Red soil, NaOH-Pi and HCl-P in the Black soil, and HCl-P in the Fluvo-aquic soil. The plant P derived from fertilizer and soil increased with increasing P addition rates in all three soils. In the soils with low-P availability, fertilizer contributed more P to plants than soil, whereas in the initially high-P soil, the opposite occurred. In conclusion, the partitioning of fertilizer P to various soil P fractions is dependent on the soil type, and the contribution of P derived from fertilizer to maize P uptake was related inversely to the soil legacy P.
KW - isotopic dilution
KW - P fertilizer partitioning
KW - soil P fractions
KW - soil type
KW - Zea mays L.
UR - http://www.scopus.com/inward/record.url?scp=85164318162&partnerID=8YFLogxK
U2 - 10.1002/fes3.476
DO - 10.1002/fes3.476
M3 - Article
AN - SCOPUS:85164318162
SN - 2048-3694
VL - 12
JO - Food and Energy Security
JF - Food and Energy Security
IS - 5
M1 - e476
ER -