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Extractor efficiency and critical phosphorus levels for establishing pasture in Amazonas.
- Source :
-
Brazilian Journal of Agricultural Sciences / Revista Brasileira de Ciências Agrárias . 2021, Vol. 16 Issue 1, p1-9. 9p. - Publication Year :
- 2021
-
Abstract
- The Mehlich-1 extractor is the most used in Brazil, however it extracts low phosphorus (P) levels in soils with high clay levels and iron-bound (Fe) and aluminum (Al) fractions. Thus, we aimed to evaluate the P availability and fertility classes in Yellow Latosol (YL) and Gleysol Haplicum (GH) soils using Mehlich-1, Mehlich-3 and anion exchange resin extractors, as well as to estimate the critical P levels in the soil and in plants for establishing Urochloa humidicola cv. Common. All extractors were efficient in evaluating the availability of P in the soil, however the anion exchange resin showed a high correlation with the P accumulation in the shoot, which can be considered the most efficient method in P extraction. However, we recommend the Mehlich-3 extractor due to its high efficiency in extracting the P linked to the Fe and Al fractions, in addition to being a multi-element extractor. The critical level of P in the soil for establishing U. humidicola by Mehlich-3 in YL is 10.32 mg dm-3, while it is 7.46 mg dm-3 in GH. The critical P level in plants grown in YL is 1.20 mg dm-3, and it is 1.54 mg dm-3 in GH. The estimated phosphate doses can be recommended for cultivating U. humidicola and can serve as a reference for future research on correlating and calibrating P doses. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 19811160
- Volume :
- 16
- Issue :
- 1
- Database :
- Academic Search Index
- Journal :
- Brazilian Journal of Agricultural Sciences / Revista Brasileira de Ciências Agrárias
- Publication Type :
- Academic Journal
- Accession number :
- 154913548
- Full Text :
- https://doi.org/10.5039/agraria.v16i1a8523