Effect of water and citrate solubility on agronomic effectiveness of acidulated phosphates in three consecutive corn crops
In the process of phosphate rock acidulation, several impure P compounds may be formed along with the desirable Ca and NH4 phosphates. Such compounds normally reduce the content of water-soluble P and thus the agronomic effectiveness of commercial fertilizers. In order to study this problem, a green...
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Sociedade Brasileira de Ciência do Solo
2002-09-01
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| Series: | Revista Brasileira de Ciência do Solo |
| Subjects: | |
| Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832002000300018&lng=en&tlng=en |
| _version_ | 1818320817539252224 |
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| author | L. I. Prochnow B. van Raij J. C. Kiehl |
| author_facet | L. I. Prochnow B. van Raij J. C. Kiehl |
| author_sort | L. I. Prochnow |
| collection | DOAJ |
| description | In the process of phosphate rock acidulation, several impure P compounds may be formed along with the desirable Ca and NH4 phosphates. Such compounds normally reduce the content of water-soluble P and thus the agronomic effectiveness of commercial fertilizers. In order to study this problem, a greenhouse experiment consisting of three consecutive corn crops was conducted in samples of a Red-Yellow Latosol (Typical Hapludox) in a completely randomized design (6 x 2 x 2), with four replicates. Six commercial fertilizers were added to 2 kg of soil at a rate of 70 mg kg-1 P, based on the content of soluble P in neutral ammonium citrate plus water (NAC + H2O) of the fertilizers. Fertilizer application occurred either in the original form or leached to remove the water-soluble fraction, either by mixing the fertilizer with the whole soil in the pots or with only 1 % of its volume. The corn plants were harvested 40 days after emergence to determine the shoot dry matter and accumulated P. For the first crop and localized application, the elimination of water-soluble P from the original fertilizers resulted in less bioavailable P for the plants. For the second and third crops, the effects of P source, leaching and application methods were not as evident as for the first, suggesting that the tested P sources may have similar efficiencies when considering successive cropping. The conclusion was drawn that the water-insoluble but NAC-soluble fractions of commercial P fertilizers are not necessarily inert because they can provide P in the long run. |
| first_indexed | 2024-12-13T10:31:02Z |
| format | Article |
| id | doaj.art-3754581f2b494c4591347ad80405315f |
| institution | Directory Open Access Journal |
| issn | 1806-9657 |
| language | English |
| last_indexed | 2024-12-13T10:31:02Z |
| publishDate | 2002-09-01 |
| publisher | Sociedade Brasileira de Ciência do Solo |
| record_format | Article |
| series | Revista Brasileira de Ciência do Solo |
| spelling | doaj.art-3754581f2b494c4591347ad80405315f2022-12-21T23:50:50ZengSociedade Brasileira de Ciência do SoloRevista Brasileira de Ciência do Solo1806-96572002-09-0126372973610.1590/S0100-06832002000300018S0100-06832002000300018Effect of water and citrate solubility on agronomic effectiveness of acidulated phosphates in three consecutive corn cropsL. I. Prochnow0B. van Raij1J. C. Kiehl2Universidade de São PauloEmbrapa Meio AmbienteUniversidade de São PauloIn the process of phosphate rock acidulation, several impure P compounds may be formed along with the desirable Ca and NH4 phosphates. Such compounds normally reduce the content of water-soluble P and thus the agronomic effectiveness of commercial fertilizers. In order to study this problem, a greenhouse experiment consisting of three consecutive corn crops was conducted in samples of a Red-Yellow Latosol (Typical Hapludox) in a completely randomized design (6 x 2 x 2), with four replicates. Six commercial fertilizers were added to 2 kg of soil at a rate of 70 mg kg-1 P, based on the content of soluble P in neutral ammonium citrate plus water (NAC + H2O) of the fertilizers. Fertilizer application occurred either in the original form or leached to remove the water-soluble fraction, either by mixing the fertilizer with the whole soil in the pots or with only 1 % of its volume. The corn plants were harvested 40 days after emergence to determine the shoot dry matter and accumulated P. For the first crop and localized application, the elimination of water-soluble P from the original fertilizers resulted in less bioavailable P for the plants. For the second and third crops, the effects of P source, leaching and application methods were not as evident as for the first, suggesting that the tested P sources may have similar efficiencies when considering successive cropping. The conclusion was drawn that the water-insoluble but NAC-soluble fractions of commercial P fertilizers are not necessarily inert because they can provide P in the long run.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832002000300018&lng=en&tlng=enP solúvel em águaP insolúvel em águafertilizantes fosfatados aciduladosmilho |
| spellingShingle | L. I. Prochnow B. van Raij J. C. Kiehl Effect of water and citrate solubility on agronomic effectiveness of acidulated phosphates in three consecutive corn crops Revista Brasileira de Ciência do Solo P solúvel em água P insolúvel em água fertilizantes fosfatados acidulados milho |
| title | Effect of water and citrate solubility on agronomic effectiveness of acidulated phosphates in three consecutive corn crops |
| title_full | Effect of water and citrate solubility on agronomic effectiveness of acidulated phosphates in three consecutive corn crops |
| title_fullStr | Effect of water and citrate solubility on agronomic effectiveness of acidulated phosphates in three consecutive corn crops |
| title_full_unstemmed | Effect of water and citrate solubility on agronomic effectiveness of acidulated phosphates in three consecutive corn crops |
| title_short | Effect of water and citrate solubility on agronomic effectiveness of acidulated phosphates in three consecutive corn crops |
| title_sort | effect of water and citrate solubility on agronomic effectiveness of acidulated phosphates in three consecutive corn crops |
| topic | P solúvel em água P insolúvel em água fertilizantes fosfatados acidulados milho |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832002000300018&lng=en&tlng=en |
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