摘要
研究了长达18a长期不同施肥处理下红壤旱地剖面中NO3--N分布和累积的特征。结果表明:施用化肥的处理中,磷肥和有机肥料的施用能显著降低NO3--N在0~100cm土体中的积累(P<0.05);不同施肥处理(除氮钾处理),均在40~60cm之间形成NO3--N累积层,氮钾配施的旱地土壤20~40cm层中NO3--N峰值最高达70.72mg/kg;各施肥处理NO3--N残留率在0.69%~8.31%之间,有机肥的施用能显著降低NO3--N在0~100cm土体中的残留(P<0.05)。
Effects of Long-term (18 years) different fertilization on distribution and accumulation of NO3--N in profile of red soil dry land were studied. The results showed that the applications of organic fertilizer and phosphate fertilizer could reduce the accumulation of NO3--N in the 0 to 100 cm soil layers significantly (P〈0.05); the NO3--N, which under different fertilizer treatments (except the treatments of nitrogen and kalium), could be accumulated in 40 to 60 cm soil layers, and the highest peak value of NO3--N reached 70.72 mg/kg in 20 to 40 cm soil layers of dry land with combined application of nitrogen fertilizer and kalium fertilizer; the residual ratio of NO3--N in soil under different fertilization treatments was from 0.69% to 8.31%; the application of organic manure could reduce the residue of NO3--N in the 0 to 100 cm soil significantly (P 〈0.05).
出处
《湖南农业科学》
2010年第1期60-62,65,共4页
Hunan Agricultural Sciences
基金
国家973项目(2005CB121101)
"十一五"国家科技支撑计划(2006BAD05B09)
关键词
红壤旱地
长期施肥
硝态氮
red soil dry land
long-term fertilization
NO3--N