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Placement NH4 +-fertilizer as a subsurface depot stimulated the formation of "rhizosphere hotspots" with intense root growth.
We hypothesized that: (1) Placement of NH4 +-fertilizer as a subsurface depot stimulates intense root growth around the depot, forming "rhizosphere hotspots".
The coincidence of enhanced magnetite content with moderate to intense root bioturbation in the lowermost and likely also uppermost sediments of unit Qah1 suggests that magnetite formed authigenically in response to relatively wetter conditions at the beginning and end of this dry period.
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That was the beginning of his intense rooting interest in the Giants, which culminated with his purchase of 50percentt of the team in 1991.
Among others, intense rooting in nutrient patches and increased nutrient uptake rates favour exploitation of subsurface fertilizer depots.
Placement of a highly concentrated subsurface NH4 +-depot induced the formation of rhizosphere hotspots with intense rooting around the depots with moderate bulk soil N min favouring depot-zone root growth.
However, after washing away soil from the rhizoboxes, intense rooting induced by the NH4 +-depot in soil areas with less toxic NH4 + concentrations could be observed across all background N min levels (Fig. 2).
Nevertheless, it has been shown that intense rooting may not occur around fertilizer depots based on manure or mineral N under greenhouse and field conditions [10]; (Müller et al. 2009, unpublished results).
Under field conditions, placement of NH4 + fertilizer as a subsurface depot sustained high NH4 + concentrations within the depot that stimulated intense depot root growth.
Therefore, intense localized root growth could be observed around a subsurface fertilizer depot based on high concentrations of NH4 + stabilized with DMPP, which led to higher N and P concentrations and contents in maize shoots (Zea mays L). in comparison to variants with homogenously incorporated NO3 −-fertilizer [30].
In our rhizobox experiment, placement of 15N-labelled stabilized (NH4 2SO4 + DMPP as a depot led to the formation of intense localized root growth around the depot (rhizosphere hotspot), which in turn led to improved N-uptake as shown by higher shoot N concentration, 15N signal and N content compared to plants under homogenous supply of NO3 −.
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