Localized application of phosphorus and ammonium improves growth of maize seedlings by stimulating root proliferation and rhizosphere acidification

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Do plants need nitrate? The mechanisms by which nitrogen form affects plants (2013, background): “In field experiments in calcareous soils, the localised application of P with NH4+, but not NO3− or urea, greatly stimulated root proliferation in maize (Jing et al., 2010).”
Acquisition of phosphorus and other poorly mobile nutrients by roots. Where do plant nutrition models fail? (2011, background): “Root foraging is especially crucial when nutrients are not homogeneously distributed as may occur in the case of fertilizer placement for instance (Jing et al. 2010; Zhang et al. 2010).”
Microbial Consortia versus Single-Strain Inoculants: An Advantage in PGPM-Assisted Tomato Production? (2019, background): “Even a further promotion of the acidification effect by placement of a stabilized ammonium fertilizer, leading to localized root proliferation and ammonium-induced proton extrusion [53], was not effective in this context.”