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 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).
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Format: | Journal Article biblioteca |
Language: | English |
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Springer
2006-05
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Subjects: | maize, cowpeas, nutrient availability, phosphorus, savannas, maíz, caupí, disponibilidad de nutrientes, fósforo, sabanas, |
Online Access: | https://hdl.handle.net/10568/43960 https://doi.org/10.1007/s11104-006-0016-1 |
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dig-cgspace-10568-439602023-12-08T19:36:04Z 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, R. 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 1573-5036 https://hdl.handle.net/10568/43960 https://doi.org/10.1007/s11104-006-0016-1 en Copyrighted; all rights reserved Limited Access Springer Plant and Soil |
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maize cowpeas nutrient availability phosphorus savannas maíz caupí disponibilidad de nutrientes fósforo sabanas maize cowpeas nutrient availability phosphorus savannas maíz caupí disponibilidad de nutrientes fósforo sabanas |
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maize cowpeas nutrient availability phosphorus savannas maíz caupí disponibilidad de nutrientes fósforo sabanas 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, R. Plant-available P for maize and cowpea in P-deficient soils from the Nigerian Northern Guinea savanna : Comparison of E- and L-values |
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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 |
topic_facet |
maize cowpeas nutrient availability phosphorus savannas maíz caupí disponibilidad de nutrientes fósforo sabanas |
author |
Pypers, Pieter Loon, L. van Diels, J. Abaidoo, Robert C. Smolders, E. Merckx, R. |
author_facet |
Pypers, Pieter Loon, L. van Diels, J. Abaidoo, Robert C. Smolders, E. Merckx, R. |
author_sort |
Pypers, Pieter |
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_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_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_sort |
plant-available p for maize and cowpea in p-deficient soils from the nigerian northern guinea savanna : comparison of e- and l-values |
publisher |
Springer |
publishDate |
2006-05 |
url |
https://hdl.handle.net/10568/43960 https://doi.org/10.1007/s11104-006-0016-1 |
work_keys_str_mv |
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