摘要
利用渗漏计,研究了NO_3^--N在土体内的分布、淋溶规律。结果表明,施肥量增加,NO_3^--N淋失量增加,作物利用率降低。施肥量与NO_3^--N淋失量有极显著相关性。施入土壤中的氮肥都以NO_3^--N形式被淋失,可占总淋失量的98％。淋失到不同深度以下的NO_3^--N量与种植的作物及季节有关。为合理施肥提出了定量的数学模型。
This experiment was performed to research patterns and leaching characteristics of NO_3^--N in soil with lysimeter. The result showed that the ammount of leaching NO_3^--N increased as rates of fertilizer application increase, but plant utilization efficiency decreased Regression analysis showed a significant correlation between rates of fertilizer application and ammount of leaching NO_3^--N. N fertilizer applying in soil leached as NO_3^--N, while leaching of NO_3^--N ammount to 98％ of the total N of leaching losses. The ammount of NO_3^--N leaching to different depth related to crops and seasons. A quantitative mathematics model was presenated for applying fertilizer rationally in this paper.
出处
《农业环境保护》
CSCD
1993年第6期250-253,共4页
Agro-Environmental Protection
