Laboratory measurements of ammonia volatilization from five nitrogen-containing fertilizers after surface application at different rates on a neutral to alkaline soil

C. C. Preez, R. Burger
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引用次数: 2

Abstract

Volatilization losses of NH3 from five fertilizers, namely (NH4)2SO4, LAN, urea, MAP and DAP were determined. The fertilizers were applied to a Bainsvlei soil of which the pH was adjusted to 6,5; 7,6; 8,3 and 9,1. The application levels were equivalent to 0, 15, 30, 60, 120 and 240 kg N ha−1. After a contact period of three days NH3 losses were determined. Ammonia was lost from all fertilizers under all treatments. The losses increased with increasing pH values and levels of application. These five nitrogen-containing fertilizers differ significantly from each other with regard to volatilization of NH3. They can be ranked in order of increasing NH3 losses as follows: LAN < MAP < (NH4)2SO4 < DAP < urea. These differences can be explained by the composition and properties of the fertilizers.
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在中性至碱性土壤上以不同速率施用五种含氮肥料后氨挥发的实验室测量
测定了(NH4)2SO4、LAN、尿素、MAP和DAP 5种肥料NH3的挥发损失。将肥料施用于pH值调整为6,5的Bainsvlei土壤;7, 6;8,3和9,1。施氮量分别为0、15、30、60、120和240 kg N ha−1。接触3天后测定氨损失。在所有处理下,氨都从所有肥料中流失。随着pH值和施用水平的增加,损失也随之增加。这五种含氮肥料的NH3挥发量差异显著。NH3损失增加的顺序为:LAN < MAP < (NH4)2SO4 < DAP <尿素。这些差异可以用肥料的成分和性质来解释。
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