期刊
SOIL USE AND MANAGEMENT
卷 38, 期 3, 页码 1370-1379出版社
WILEY
DOI: 10.1111/sum.12786
关键词
biosolids; corn; field study; Rhizophagus irregularis; triple super phosphate
类别
资金
- Natural Sciences and Engineering Research Council of Canada [RGPIN-2017-05391]
- Agriculture and Agri-Food Canada [AGGP2-33]
- Islamic Development Bank
The study evaluated the symbiosis between maize roots and arbuscular mycorrhizal fungi, finding that this symbiosis is more closely related to maize growth than the concentration of plant-available phosphorus.
Maize roots are colonized by arbuscular mycorrhizal fungi, but less mycorrhizal symbiosis is expected as the plant-available phosphorus (P) concentration of soil increases, based on greenhouse and growth bench experiments. The objective of this study was to evaluate maize root colonization by arbuscular mycorrhizal fungi in a sandy loam soil with a gradient of plant-available P concentrations resulting from P fertilizer inputs. The field experiment received inorganic and organic P fertilizers for 3 years, and this created a 20-fold difference in the plant-available P concentration, from 12 to 204 mg Mehlich-3 extractable P kg(-1). The proportion of maize roots colonized with arbuscular mycorrhizal fungi increased from 26 +/- 2% during vegetative growth (V8 and VT growth stages) to 46 +/- 2% in the reproductive R2 and R6 stages. The P fertilizer input did not affect maize root colonization by arbuscular mycorrhizal fungi. More arbuscular mycorrhizal fungi colonization of maize roots occurred in soil with increasing plant-available P concentrations (r = .12, p = .05, n = 237), and this was associated with greater P uptake in the maize shoots (r = .53, p < .001, n = 240). We conclude that the root-mycorrhizal symbiosis was more strongly related to maize growth than the plant-available P concentration under field conditions.
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