Publikationsdatum:
1993-05-01
Beschreibung:
Lignosulfonate (LS) has been used as a carrier for micronutrients and has the potential to improve macronutrient fertilizer efficiency, but little is known about the behaviour of LS fertilizer mixtures in soil. A laboratory study was conducted using ammonium lignosulfonate (2.67% wt wt−1) in combination with diammoniumphosphate (DAP), urea (U) and U+DAP incubated in a silty clay loam soil. The experiment monitored CO2 evolution and NH3–N volatilization for 69 d and extractable soil N periodically for 38 d. Addition of LS initially increased CO2 evolution, but only a small proportion (10–22%) of the LS-C was evolved as CO2. Lignosulfonate decreased urea hydrolysis slightly and reduced the proportion of added N volatilized from the LS+U treatment. Lignosulfonate treatments accumulated N in the form of [Formula: see text], suggesting that LS may inhibit nitrification. A larger proportion of added inorganic N was recovered in the LS + fertilizer treatments, indicating that LS may increase fertilizer N availability. Key words: Lignosulfonate, urea, diammonium phosphate, ammonia volatilization, nitrification, fertilizer efficiency
Print ISSN:
0008-4271
Digitale ISSN:
1918-1841
Thema:
Geologie und Paläontologie
,
Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
