CIFOR-ICRAF s’attaque aux défis et aux opportunités locales tout en apportant des solutions aux problèmes mondiaux concernant les forêts, les paysages, les populations et la planète.

Nous fournissons des preuves et des solutions concrètes pour transformer l’utilisation des terres et la production alimentaire : conserver et restaurer les écosystèmes, répondre aux crises mondiales du climat, de la malnutrition, de la biodiversité et de la désertification. En bref, nous améliorons la vie des populations.

CIFOR-ICRAF publie chaque année plus de 750 publications sur l’agroforesterie, les forêts et le changement climatique, la restauration des paysages, les droits, la politique forestière et bien d’autres sujets encore, et ce dans plusieurs langues. .

CIFOR-ICRAF s’attaque aux défis et aux opportunités locales tout en apportant des solutions aux problèmes mondiaux concernant les forêts, les paysages, les populations et la planète.

Nous fournissons des preuves et des solutions concrètes pour transformer l’utilisation des terres et la production alimentaire : conserver et restaurer les écosystèmes, répondre aux crises mondiales du climat, de la malnutrition, de la biodiversité et de la désertification. En bref, nous améliorons la vie des populations.

CIFOR–ICRAF publishes over 750 publications every year on agroforestry, forests and climate change, landscape restoration, rights, forest policy and much more – in multiple languages.

CIFOR–ICRAF addresses local challenges and opportunities while providing solutions to global problems for forests, landscapes, people and the planet.

We deliver actionable evidence and solutions to transform how land is used and how food is produced: conserving and restoring ecosystems, responding to the global climate, malnutrition, biodiversity and desertification crises. In short, improving people’s lives.

Opportunities for capture of deep soil nutrients

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This paper discusses the mechanisms by which nutrients occur in deep layers which include downward leaching of mobile nutrients, biological breakdown of soil organic matter and chemical breakdown of minerals. Soil nutrients not accessible to annual crops can be extracted by perennials through two processes: (i) the retrieval of nutrients already present in layers below the effective extent of rooting of annual crops; and (ii) the interception of nutrients moving below or outside the rooting zone of annuals. Several agroecosystems with the potential for more efficient use of nutrient resources in deep soil are illustrated: (i) intercropping perennials and annuals for complementarity in resource use; (ii) incorporating annuals into underutilized zones of tree plantations; and (iii) mixing plant species for spatial complementarity. Finally, suggestions to prevent the accumulation of mobile nutrients (nitrate) in deep soil are provided, including research in Kenya demonstrating that phosphorus fertilizer application can reduce nitrate accumulation in deep soil during continuous cropping of maize

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