@inbook{f5169973190e4f5b856eb210725e272c,
title = "Old tree root channels in acid soils in the humid tropics: Important for crop root penetration, water infiltration and nitrogen management",
keywords = "bacteri{\"e}n, bosbouw, uitspoelen, stikstof, stikstofkringloop, plantenontwikkeling, plantenfysiologie, wortels, bodem, bodemaciditeit, bodem ph, subtropen, tropen, bacteria, forestry, leaching, nitrogen, nitrogen cycle, plant development, plant physiology, roots, soil, soil acidity, soil ph, subtropics, tropics",
author = "{van Noordwijk}, M. and Widianto and M. Heinen",
year = "1991",
language = "English",
pages = "423--430",
booktitle = "Plant-soil interactions at low pH",
}