农业实验表明,禾草生长对有机肥料中的氮反应敏感。但在南英格兰许多田间实验表明,牛粪泥中的氮被禾草吸收的平均值仅为13%。粪泥中氨的挥发呵能是致使氮无效的原因之一。用小气候平衡法可以直接测定氨的挥发。木报告介绍了在北爱尔兰用此法测得地面撒施牛粪泥后氨损失的实验结果。试验设在安特里姆农业园艺学院生产青贮饲 Agricultural experiments show that grass growth is sensitive to nitrogen in organic fertilizers. However, many field experiments in South England show that nitrogen in cow dung is absorbed by the grasses at an average of only 13%. Volatilization of ammonia in manure is one of the causes of nitrogen inefficiency. The use of microclimate balance method can be directly measured ammonia volatilization. The Wood report presents the experimental results of ammonia losses after application of cow dung on the ground measured in Northern Ireland using this method. The experiment was to produce silage at the Antrim Agricultural Horticultural Institute