Nitrate leaching and pasture production from different nitrogen sources on a shallow stoney soil under flood-irrigated dairy pasture

被引:87
作者
Di, HJ [1 ]
Cameron, KC [1 ]
机构
[1] Lincoln Univ, Ctr Soil & Environm Qual, Canterbury, New Zealand
来源
AUSTRALIAN JOURNAL OF SOIL RESEARCH | 2002年 / 40卷 / 02期
关键词
groundwater; denitrification; mineralisation; grazing; forage;
D O I
10.1071/SR01015
中图分类号
S15 [土壤学];
学科分类号
0903 ; 090301 ;
摘要
The leaching of nitrate (NO3-) in intensive agricultural production systems, e. g. dairy pastures, is a major environmental concern in many countries. In this lysimeter study we determined the amount of NO3- leached following the application of urea, dairy effluent, urine returns, and pasture renovation to a free-draining Lismore stony silt loam (Udic Haplustept loamy skeletal) growing a mixture of perennial ryegrass (Lolium perenne) and white clover (Trifolium repens) pasture. The study showed that NO3--N leaching losses ranged from 112 to 162 kg N/ha per year, depending on the amount and forms of N applied and pasture conditions. Nitrate leaching under the urine patches was the main contributor to the N leaching loss in a grazed paddock. Nitrate leaching losses were lower for urine applied in the spring (29% of N applied) than for urine applied in the autumn (38-58%). The application of urea or dairy effluent only contributed a small proportion to the total NO3- leaching loss in a grazed paddock. Pasture renovation by direct-drilling may also have caused an increase in NO3- leaching (c. 31 kg N/ha) in the first year. Modelled annual average NO3--N concentrations in the mixed recharge water in the acquifer were significantly lower than those measured under the rooting zone due to dilution effects by recharge water from other sources (3.9 v. 13-27 mg N/L). Herbage nitrogen offtake and dry matter yield were higher in the urine treatments than in the non-urine treatments.
引用
收藏
页码:317 / 334
页数:18
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