Nutrient Cycling in Agroecosystems

, Volume 77, Issue 2, pp 127–141

Impact of planted fallows and a crop rotation on nitrogen mineralization and phosphorus and organic matter fractions on a Colombian volcanic-ash soil

  • T. A. Basamba
  • E. Barrios
  • B. R. Singh
  • I. M. Rao
Original Paper

DOI: 10.1007/s10705-006-9050-x

Cite this article as:
Basamba, T.A., Barrios, E., Singh, B.R. et al. Nutr Cycl Agroecosyst (2007) 77: 127. doi:10.1007/s10705-006-9050-x

Abstract

Soil fertility replenishment is a critical factor that many farmers in the tropical American hillsides have to cope with to increase food crop production. The effect of three planted fallow systems (Calliandra houstoniana-CAL, Indigofera zollingeriana-IND, Tithonia diversifolia-TTH) and a crop rotation (maize/beans-ROT) on soil nitrogen mineralization, organic matter and phosphorus fractions was compared to the usual practice of allowing natural regeneration of native vegetation or natural fallow management (NAT). Studies were conducted on severely degraded Colombian volcanic-ash soils, 28 months after fallow establishment, at two on-farm experimental sites (BM1 and BM2) in the Cauca Department. Tithonia diversifolia had a significantly higher contribution to exchangeable Ca, K and Mg as well as B and Zn; the order of soil nutrient contribution was TTH > CAL > IND > NAT > ROT. On the other hand, lND had significantly higher soil NO3–N at both experimental farms as compared to all the other fallow system treatments. For the readily available P fraction, CAL and ROT had significantly higher H2O–Po and resin-Pi, respectively, in the 0–5 cm soil layer; whereas TTH showed significantly higher values for both H2O–Po and resin-Pi in the 5–10 cm soil layer. Significant effects were observed on the weights of the soil organic matter fractions which decreased in the order LL (Ludox light) > LM (Ludox intermediate) > LH (Ludox heavy). Indigofera zollingeriana showed greater C, N and P in the soil organic matter fractions than all the other fallow treatments, with NAT having the lowest values. It is concluded that planted fallows can restore soil fertility more rapidly than natural fallows.

Keywords

Calliandra houstonianaIndigofera zollingerianaNitrogen mineralization potentialPhosphorus fractionsPlanted fallowsResidual effectSoil organic matter fractionsTithonia diversifoliaVolcanic-ash soil

Copyright information

© Springer Science+Business Media B.V. 2006

Authors and Affiliations

  • T. A. Basamba
    • 1
  • E. Barrios
    • 2
  • B. R. Singh
    • 1
  • I. M. Rao
    • 2
  1. 1.Department of Plant and Environmental SciencesNorwegian University of Life SciencesAasNorway
  2. 2.Tropical Soil Biology and Fertility (TSBF) InstituteCentro Internacional de Agricultura Tropical (CIAT)CaliColombia