Plant-available P for maize and cowpea in P-deficient soils from the Nigerian Northern Guinea savanna : Comparison of E- and L-values
There are several indications that legumes are capable of accessing sparingly soluble phosphorus (P) in the soil through root-induced processes. We hypothesize that this plant-induced mobilization of P can be demonstrated if the plant accessible P assessed by isotopic dilution ( L-value ) exceeds th...
| Main Authors: | , , , , , |
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| Format: | Journal Article |
| Language: | Inglés |
| Published: |
Springer
2006
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| Subjects: | |
| Online Access: | https://hdl.handle.net/10568/43960 |
| _version_ | 1855538508567937024 |
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| author | Pypers, Pieter Loon, L. van Diels, J. Abaidoo, Robert C. Smolders, E. Merckx, Roel |
| author_browse | Abaidoo, Robert C. Diels, J. Loon, L. van Merckx, Roel Pypers, Pieter Smolders, E. |
| author_facet | Pypers, Pieter Loon, L. van Diels, J. Abaidoo, Robert C. Smolders, E. Merckx, Roel |
| author_sort | Pypers, Pieter |
| collection | Repository of Agricultural Research Outputs (CGSpace) |
| description | There are several indications that legumes are capable of accessing sparingly soluble phosphorus (P) in the soil through root-induced processes. We hypothesize that this plant-induced mobilization of P can be demonstrated if the plant accessible P assessed by isotopic dilution ( L-value ) exceeds the corresponding values assessed in soil extracts ( E-values ). A greenhouse experiment was set up to assess if L/E ratios are affected by P supply and by crop type. The L- and E-values were determined in three P-deficient soils of the Nigerian Northern Guinea savanna (NGS), applied with various rates of TSP, for two cowpea varieties (Vigna unguiculata L., cv Dan-Ila and cv IT-82D-716) and maize (Zea mays L., cv oba super I) as a reference. Plants grown in control soils were severely P-deficient. Plant growth and shoot P uptake significantly increased with increasing P application in all three soils and for all crops, but relative yield and shoot-P responses to P application were similar between maize and cowpea. Both L- and E-values increased with increasing P application. Average L/E ratios for maize were 1.4±0.3 and were unaffected by the P application. For cowpea in contrast, L/E ratios were 3.1±0.2 (significantly larger than one) in one of the three control soils and significantly decreased to 1.3±0.1 at largest P supply. Elevated L/E ratios in cowpea were not associated with an increase in P uptake compared to the other two control soils in which no increase in L/E ratio was observed. It is concluded that cowpea is able to access non-labile P under P-deficient conditions. However, this process cannot overcome P deficiency in these soils, probably because P uptake is limited by the small P concentration in the soil solution (1 2 ?g P L?1) and this limitation is not overcome by an increase in the accessible soil P quantity (L-value). |
| format | Journal Article |
| id | CGSpace43960 |
| institution | CGIAR Consortium |
| language | Inglés |
| publishDate | 2006 |
| publishDateRange | 2006 |
| publishDateSort | 2006 |
| publisher | Springer |
| publisherStr | Springer |
| record_format | dspace |
| spelling | CGSpace439602024-08-27T10:37:05Z Plant-available P for maize and cowpea in P-deficient soils from the Nigerian Northern Guinea savanna : Comparison of E- and L-values Pypers, Pieter Loon, L. van Diels, J. Abaidoo, Robert C. Smolders, E. Merckx, Roel maize cowpeas nutrient availability phosphorus savannas maíz caupí disponibilidad de nutrientes fósforo sabanas There are several indications that legumes are capable of accessing sparingly soluble phosphorus (P) in the soil through root-induced processes. We hypothesize that this plant-induced mobilization of P can be demonstrated if the plant accessible P assessed by isotopic dilution ( L-value ) exceeds the corresponding values assessed in soil extracts ( E-values ). A greenhouse experiment was set up to assess if L/E ratios are affected by P supply and by crop type. The L- and E-values were determined in three P-deficient soils of the Nigerian Northern Guinea savanna (NGS), applied with various rates of TSP, for two cowpea varieties (Vigna unguiculata L., cv Dan-Ila and cv IT-82D-716) and maize (Zea mays L., cv oba super I) as a reference. Plants grown in control soils were severely P-deficient. Plant growth and shoot P uptake significantly increased with increasing P application in all three soils and for all crops, but relative yield and shoot-P responses to P application were similar between maize and cowpea. Both L- and E-values increased with increasing P application. Average L/E ratios for maize were 1.4±0.3 and were unaffected by the P application. For cowpea in contrast, L/E ratios were 3.1±0.2 (significantly larger than one) in one of the three control soils and significantly decreased to 1.3±0.1 at largest P supply. Elevated L/E ratios in cowpea were not associated with an increase in P uptake compared to the other two control soils in which no increase in L/E ratio was observed. It is concluded that cowpea is able to access non-labile P under P-deficient conditions. However, this process cannot overcome P deficiency in these soils, probably because P uptake is limited by the small P concentration in the soil solution (1 2 ?g P L?1) and this limitation is not overcome by an increase in the accessible soil P quantity (L-value). 2006-05 2014-10-02T08:33:00Z 2014-10-02T08:33:00Z Journal Article https://hdl.handle.net/10568/43960 en Limited Access Springer |
| spellingShingle | maize cowpeas nutrient availability phosphorus savannas maíz caupí disponibilidad de nutrientes fósforo sabanas Pypers, Pieter Loon, L. van Diels, J. Abaidoo, Robert C. Smolders, E. Merckx, Roel Plant-available P for maize and cowpea in P-deficient soils from the Nigerian Northern Guinea savanna : Comparison of E- and L-values |
| title | Plant-available P for maize and cowpea in P-deficient soils from the Nigerian Northern Guinea savanna : Comparison of E- and L-values |
| title_full | Plant-available P for maize and cowpea in P-deficient soils from the Nigerian Northern Guinea savanna : Comparison of E- and L-values |
| title_fullStr | Plant-available P for maize and cowpea in P-deficient soils from the Nigerian Northern Guinea savanna : Comparison of E- and L-values |
| title_full_unstemmed | Plant-available P for maize and cowpea in P-deficient soils from the Nigerian Northern Guinea savanna : Comparison of E- and L-values |
| title_short | Plant-available P for maize and cowpea in P-deficient soils from the Nigerian Northern Guinea savanna : Comparison of E- and L-values |
| title_sort | plant available p for maize and cowpea in p deficient soils from the nigerian northern guinea savanna comparison of e and l values |
| topic | maize cowpeas nutrient availability phosphorus savannas maíz caupí disponibilidad de nutrientes fósforo sabanas |
| url | https://hdl.handle.net/10568/43960 |
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