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- Title
Phosphorus uptake of rice plants is affected by phosphorus forms and physicochemical properties of tropical weathered soils.
- Authors
Nishigaki, Tomohiro; Tsujimoto, Yasuhiro; Rinasoa, Seheno; Rakotoson, Tovohery; Andriamananjara, Andry; Razafimbelo, Tantely
- Abstract
Aims: Phosphorus (P) deficiency is a major constraint for rice production in the tropics. Field-specific P management is key for resource-limited farmers to increase yields with minimal inputs. We used soil P fractionation analysis to identify the relevant factors controlling P uptake and the responses to P fertilization of rice in flooded and highly weathered soils.Methods: Phytometric pot-based experiments and a modified Hedley fractionation analysis were repeated for soils from extensive regions and from geographically adjacent fields in Madagascar.Results: Large field-to-field variations in indigenous P supply from soils (total P uptake of rice when P is omitted) and fertilizer-P recovery efficiencies (increased P uptake when P is applied) were observed not only for soils with various geological backgrounds but also for soils from adjacent fields. Regression models indicated that the indigenous P supply in soils was largely controlled by readily available inorganic and organic P pools (r2 = 0.72), whereas fertilizer-P recovery efficiencies were controlled by the abundance of oxalate-extractable aluminum and iron in soils (r2 = 0.81).Conclusions: Spatial heterogeneity even within adjacent fields leads to benefits from field-specific fertilizer management based on indigenous P supply from soils and fertilizer-P recovery efficiencies evaluated by different soil properties.
- Subjects
PLANT growth; PHOSPHORUS in soils; CROP yields; SOIL pollution; FERTILIZERS
- Publication
Plant & Soil, 2019, Vol 435, Issue 1/2, p27
- ISSN
0032-079X
- Publication type
Article
- DOI
10.1007/s11104-018-3869-1