Arbuscular mycorrhizal enhancement of phosphorus uptake and yields of maize under high planting density in the black soil region of China.

Furthermore, for different soil profiles, the hyphal P uptake and hyphal length density showed an extremely significant positive relationship for both cropping years ( P < 0.01), and the different slope of the line indicated AM fungi might much more efficient in making soil Olsen-P available in 2013 than in 2014 (Fig. 4 c).

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