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Anglický jazyk
BYPASS FLOW NITROGEN LOSSES IN VERTISOLS IN TROPICAL ENVIRONMENTS
Autor: Charles Onyango
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,... Viac o knihe
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O knihe
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 (p0.05) 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 (p0.05) 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.
- Vydavateľstvo: LAP LAMBERT Academic Publishing
- Rok vydania: 2011
- Formát: Paperback
- Rozmer: 220 x 150 mm
- Jazyk: Anglický jazyk
- ISBN: 9783844305951
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