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Article V. Regrowth dynamics of periodically pruned leguminous selvice trees

by Chesney, Patrick E; Vaast, Philippe (autor/a); Schlöenvoigt, Andrea (autor/a); Kass, Donald (autor/a); Vlek, Paul (autor/a); Murach, Dieter (autor/a).
Type: materialTypeLabelArticleDescription: 20 páginas.Subject(s): PODA | RAICES | ARBOLES | ARBOLES FIJADORES DEL NITROGENO | TROPICOS HUMEDOS | ECOLOGIA FORESTAL | BOSQUE TROPICAL HUMEDO | ERYTHRINA POEPPIGIANA | CULTIVO EN CALLEJONES | CARBOHIDRATOS | ALMIDON | ESPECIES | SILVICULTURA | TURRIALBA | COSTA RICAOnline Resources: Texto completo (En) | http://hdl.handle.net/11554/8907 In: Pruning effects on roots of nitrogen fixing trees in the humid tropicsSummary: In agroforestry practices in the humid tropics, fast growing leguminous trees are pruned to reduce tree-crop competition for light The pruned material contains organic inputs for crop nutrition. To find out how these inputs might be affected by different pruning intensities, measurements were taken on dry matter (DM), total tissue nitrogen (N) and phosphorous (P) in leaves, branches, stems and roots of Eryt/¡rina poeppigiana and Gliricidia sepilllll. The pruning treatments evaluated were unpruned, complete (removal of aIl shoots) and partial (retention of one branch on the pruned stump) pruning carried out in an aIley cropping experiment in Turrialba, Costa Rica. In E poeppigiana trees, tissue N concentration in descending order was leaves>branches>roots>stems and that of tissue P concentration was leaves>branches>stems=roots for partiaIly versus completely pruned trees, respectively. N and P accumulation in 12-week-old leafy branch regrowth of2 Mg vs. 1.5 Mg DM ha"1 was 72 kg vs. 27 kg N ha"1 and 7 kg vs. 2 kg P ha"1 for partiaIly versus completely pruned trees, respectively. In G. sepilllll trees, tissue N concentration in descending order was leaves>branches>roots>stems and that of tissue P concentration was branches>leaves>roots>stems. N and P accumulation in 12 week-old leafy branch regrowth of 0.2 Mg vs. 0.3 Mg DM ha"1 was 14 kg vs. 9 kg N hal and 1.2 kg vs. 0.7 kg P ha"1 for partiaIly versus completely pruned trees, respectively. G. sepiul/l aIlocated more N and P to stems and expended twice as much DM per unit root length than did E poeppigia/la. Retention of a branch increased nutrient accumulation of pruned trees, particularIy in E poeppígiana, and hence higher nutrient inputs for associated crops.
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Artículo de tesis (Doctorado) - CATIE, Turrialba (Costa Rica), 2000

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In agroforestry practices in the humid tropics, fast growing leguminous trees are pruned to reduce tree-crop competition for light The pruned material contains organic inputs for crop nutrition. To find out how these inputs might be affected by different pruning intensities, measurements were taken on dry matter (DM), total tissue nitrogen (N) and phosphorous (P) in leaves, branches, stems and roots of Eryt/¡rina poeppigiana and
Gliricidia sepilllll. The pruning treatments evaluated were unpruned, complete (removal of aIl shoots) and partial (retention of one branch on the pruned stump) pruning carried out in
an aIley cropping experiment in Turrialba, Costa Rica. In E poeppigiana trees, tissue N concentration in descending order was leaves>branches>roots>stems and that of tissue P concentration was leaves>branches>stems=roots for partiaIly versus completely pruned trees, respectively. N and P accumulation in 12-week-old leafy branch regrowth of2 Mg vs.
1.5 Mg DM ha"1 was 72 kg vs. 27 kg N ha"1 and 7 kg vs. 2 kg P ha"1 for partiaIly versus completely pruned trees, respectively. In G. sepilllll trees, tissue N concentration in descending order was leaves>branches>roots>stems and that of tissue P concentration was branches>leaves>roots>stems. N and P accumulation in 12 week-old leafy branch regrowth of 0.2 Mg vs. 0.3 Mg DM ha"1 was 14 kg vs. 9 kg N hal and 1.2 kg vs. 0.7 kg P ha"1 for partiaIly versus completely pruned trees, respectively. G. sepiul/l aIlocated more N and P to stems and expended twice as much DM per unit root length than did E poeppigia/la. Retention of a branch increased nutrient accumulation of pruned trees, particularIy in E poeppígiana, and hence higher nutrient inputs for associated crops.

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