ABSTRACT Eight paddocks under perennial pasture were sampled on six commercial dairy farms in Tasmania, Australia on a grid with 32 to 40 topsoil samples taken from each paddock at 0–100 mm depth. The samples were analysed for soil pH and the plant available nutrients of phosphorus, potassium and sulfur. Soil nutrient levels were highly variable within paddocks due to livestock concentration and fodder management. There was a decreasing trend in nutrient concentration with increasing distance from the gate in most of the paddocks. Significant step changes occurred in the data at 0.178, 0.172 and 0.178 of total paddock length for P, K and S respectively. The implications are that no P or K fertiliser can be applied within approximately 20% of the length of the paddock from the gateway without compromising pasture productivity, as nutrients are well in excess of optimum.

中文翻译：

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奶牛牧场围场土壤养分的空间变化

摘要 在澳大利亚塔斯马尼亚的 6 个商业奶牛场对 8 个多年生牧场下的围场进行了采样，网格上从每个围场在 0-100 毫米深度采集了 32 到 40 个表土样本。分析样品的土壤 pH 值和植物可利用的磷、钾和硫养分。由于牲畜集中和饲料管理，围场内的土壤养分水平变化很大。在大多数围场中，养分浓度随着离闸门的距离增加而呈下降趋势。P、K 和 S 的总围场长度分别为 0.178、0.172 和 0.178 处的数据发生了显着的阶跃变化。其含义是，在不影响牧场生产力的情况下，在距离网关约 20% 的围场长度范围内不能施用 P 或 K 肥料，