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首页> 外文期刊>Journal of plant nutrition and soil science >Nitrate leaching from intensively and extensively grazed grassland measured with suction cup samplers and sampling of soil mineral-N I Influence of pasture management [German]
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Nitrate leaching from intensively and extensively grazed grassland measured with suction cup samplers and sampling of soil mineral-N I Influence of pasture management [German]

机译:利用吸盘采样器和土壤矿物质采样对密集放牧草地上的硝酸盐淋失进行测定-N I牧场管理的影响[德国]

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摘要

Leaching of nitrate (NO3-) from two differently managed cattle pastures was determined over four winters between 1993 and 1997 using ceramic suction cup samplers (with min. 34 cups ha(-1)); additionally, vertical soil mineral-N content in 0-0.9 in (N-min) was measured at the beginning and end of two winters (with min. 70 different sample cores ha(-1)). The experimental site in the highlands north-east of Cologne, Germany, is characterized by high annual precipitation (av., 1,362 mm between 1993 and 1996). An intensive continuous grazing management (1.3 ha, fertilized with 250 kg N ha(-1) yr(-1), average stocking density 4.9 LU ha(-1), = [I]) was tested against an extensive continuous grazing system (2.2 ha, av. 2.9 LU ha(-1); no N-fertilizer but an estimated proportion of Trifolium repens up to 15 % of total dry matter in the final year, = [E]).
机译:在1993年至1997年的四个冬季,使用陶瓷吸盘采样器(最小34杯ha(-1))确定了两个不同管理的牛牧场中的硝酸盐(NO3-)的浸出;此外,在两个冬季的开始和结束时(至少有70个不同的样本核心ha(-1))测量了垂直土壤中的土壤N含量(N-分钟)为0-0.9。该试验场位于德国科隆东北高地,其特点是年降水量高(1993年至1996年平均1,362毫米)。在一个广泛的连续放牧系统上测试了一个密集的连续放牧管理(1.3公顷,施以250 kg N ha(-1)yr(-1),平均放养密度4.9 LU ha(-1),= [I])。 2.2公顷,平均2.9公顷(-1);没有氮肥,但估计三叶草在最后一年中占总干物质的15%,= [E])。

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