We hypothesized that the integration of trees into agricultural land-use systems can reduce NO3 leaching and increase subsoil N utilization. A field study was conducted on a Kandiudalfic Eutrudox (Ochinga site) and a Kandic Paleustalf (Muange site) in the subhumid highlands of Kenya to measure changes in soil NO3 and water to 200-cm depth for one rainy season in four land-use systems (LUS): (i) planted tree fallow using Sesbania sesban (L.) Merr., (ii) unfertilized maize (Zea mays L.), (iii) weed fallow, and (iv) bare fallow. Subsoil (50-200 cm) NO3-N at the start of the season ranged from 58 to 87 kg ha-1 for the four LUS and two sites. In maize, subsoil NO3-N differed by
DOI:
https://doi.org/10.2136/SSSAJ1996.03615995006000020033XAltmetric score:
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Publication year
1996
Authors
Hartemink A E; Buresh R J; Bashir J; Janssen B H
Language
English
Keywords
nitrates, land use, fallow systems, water, leaching, field experimentation, soil nitrate
Geographic
Kenya
