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BYPASS FLOW NITROGEN LOSSES IN VERTISOLS IN TROPICAL ENVIRONMENTS: Subtitle PREDISPOSING FACTORS FOR AMMONIUM- AND NITRATE-NITROGEN LOSS IN VERTISOLS IN THE TROPICAL ENVIRONMENTS

BYPASS FLOW NITROGEN LOSSES IN VERTISOLS IN TROPICAL ENVIRONMENTS: Subtitle PREDISPOSING FACTORS FOR AMMONIUM- AND NITRATE-NITROGEN LOSS IN VERTISOLS IN THE TROPICAL ENVIRONMENTS

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  • ISBN-13: 9783844305951
  • Publisher: LAP LAMBERT Academic Publishing
  • Release Date: Mar 07, 2011
  • Pages: 68 pages
  • Dimensions: 0.16 x 8.66 x 5.91 inches

Overview

Bypass flow is one of the main avenues of fertilizer nitrogen (N) loss in agricultural fields. The magnitude of fertilizer N carried in bypass flow is influenced by soil characteristics, nitrogen species (i.e., NH4+ or NO3-) and rainfall patterns, inter alia. Wetting the soil prior to fertilizer application resulted in significantly (p<0.05) higher bypass flow and mineral N recovered in the effluent than did the no prewetting treatments. Both ammonium- and nitrate-N recovered in the bypass flow increased with rainfall intensity and frequency. Nitrogen source and rate also resulted in significant (p<0.05) increases in mineral N in the effluent. The effect of N source on ammonium-N in the effluent were in the order urea > ammonium sulphate > calcium nitrate, while the effect of N sources on nitrate-N were in the order calcium nitrate >urea = ammonium sulphate. The increase in nitrate-N in the effluent due to fertilizer rate were in the order 200 > 100 > 50 kg N ha-1. Ammonium- N losses were low being in the range 0.1 to 1 %, while nitrate-N losses were high, being in the range 0.02 to 21 % of the applied fertilizer.

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