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.

Diagnosis faktor penghambat pertumbuhan akar sengon (Paraserianthes falcataria L. Nielsen) pada Ultisol di Lampung Utara

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Due to wide-scale deforestation and their need for forest products smallholder farmers in North Lampung are becoming interested in tree farming. Farmers often cultivate a mix of fruit, spice and fast-growing timber species. Paraserianthes falcataria (sengon) is the most common timber tree in the area. This species demonstrates inconsistent performance, growing particularly poorly on ridges. Poor performance might be due to poor root development resulting from deficient soil conditions. Inhibition of root growth on acid soil is usually linked to Al toxicity, but other soil characteristics such as low P availability or soil physical factors (such as mechanical impedance or poor aeration) might be involved as well. The objective of this study was to diagnose the soil factor(s) that limit(s) the growth of Paraserianthes on ultisol in North Lampung. Measurements of soil bulk densities at different soil depths in Ultisol are difficult to interpret because clay content tends to increase with depth. This difficulty was addressed by correcting soil bulk density (BD) by using a ‘pedo transfer function’ based on clay and silt content. The resultant BDref value makes it possible to compare soils of different textures (soil depths). The results shows that the 5 year-old Paraserianthes developed a shallow root system, with about 50% of main root growing horizontally in the upper 0-30 cm of the soil. No significant correlation was found between root length density (Lrv) and the concentration of exchangeable Al or monomeric Al. Poor root growth at greater soil depth (40- 70 cm and 70-100 cm) was significantly correlated (p1.14. The data also suggests lower BD/BDref values and better root growth for microsites with higher soil organic matter as indicated by C-org/Cref. The BD/BDref ratio can be used as a tool to diagnose poor root growth on Ultisol in North Lampung.

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