Changes in soil phosphorus fractions in response to long‐term phosphate fertilization under sole cropping and intercropping of maize and faba bean on a calcareous soil

Dan Liao, Chaochun Zhang, Hans Lambers, Fusuo Zhang

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

Background and aims: Understanding how soil phosphorus (P) fractions change is critical to achieve more efficient soil P use in a highly P-sorbing calcareous soil. Methods: The fields were managed without or with annual P fertilizer (40 kg P ha− 1), continuously growing sole cropping or intercropping of maize and faba bean. Soil samples (0–200 mm) were collected at the start of the experiment and eight years later, and we evaluated P fractions using sequential fractionation. Results: Maize/faba bean intercropping had an average land equivalent ratio (LER) of 1.2, a similar P content as sole maize, while both acquired more P than sole faba bean. Compared with the original soil P fractions in 2009, three cropping systems, regardless of P fertilization, depleted the labile P pool (Resin-P and NaHCO3-Pi), while Residual-P and NaHCO3-Po accumulated. Eight years of no P input showed sole maize mainly depleted NaOH-Pi and conc. HCl-Pi, sole faba bean depleting NaOH-Po, while intercropping depleted the most abundant P fraction, 1 M HCl-Pi, in addition to NaOH-Pi. However, long-term P application caused the cropping systems to accumulate 1 M HCl-Pi while depleting the conc. HCl-Po fraction; both sole faba bean and intercropping showed accumulation of NaOH-Pi, while depleting NaOH-Po. Conclusions: Long-term appropriate P input enhanced the mineralization of mod-labile and non-labile organic P and accumulation of mod-labile inorganic P. Sole maize consistently depleted inorganic P and sole faba bean without P input depleted organic P, while intercropping accessed P pools varying with P input.

Original languageEnglish
Pages (from-to)589-600
Number of pages12
JournalPlant and Soil
Volume463
Issue number1-2
DOIs
Publication statusPublished - Jun 2021

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