Nutrient deficiencies are considered a reason for commercial yields of wheat (Triticum aestivum L.) and canola (Brassica napus L.) in the high-rainfall zone (HRZ) of southern Australia being well below predicted potential yields. With the aim of developing soil-test interpretation guidelines suitable for HRZ conditions, nutrient-response experiments, 15 with wheat and 12 with canola, were conducted between 2015 and 2018. These experiments quantified responses to nitrogen (N), phosphorus (P), potassium (K), sulfur (S), copper (Cu) and zinc (Zn) in pre-sowing soil tests. The highest yielding treatment of the wheat experiments averaged 7.1 t/ha (range 2.6–10.8 t/ha), and of the canola experiments 4.2 t/ha (range 0.7–6.2 t/ha). The most frequent responses were to N and P, followed by S and K. There were no significant positive responses to Cu or Zn. Across the experiments, the 95% critical value for Colwell P in wheat was 52 mg/kg, with a 95% confidence range of 39–68 mg/kg. For canola, the critical value was 59 mg/kg, with a range of 38–139 mg/kg. These values are higher than from lower rainfall regions of Australia. Critical values for K and S were also higher than from drier regions of Australia. The Sprengel–Lieberg Law of the Minimum overestimated yield where there were multiple nutrient limitations, whereas an equivalent Law of the Product underestimated yield under these conditions. These higher critical values based on evidence from the HRZ are expected to assist in closing the yield gap for wheat and canola in the region.

营养不足被认为是小麦（Triticum aestivum L.）和双低油菜籽（Brassica napus）商业产量的原因L.）在南澳大利亚的高雨量区（HRZ）中，远低于预测的潜在单产。为了制定适用于HRZ条件的土壤测试解释指南，在2015年至2018年之间进行了养分响应实验，其中小麦15次，油菜12次。这些实验量化了对氮（N），磷（P），播前土壤测试中的钾（K），硫（S），铜（Cu）和锌（Zn）。小麦试验的最高产量处理平均为7.1吨/公顷（2.6-10.8吨/公顷），双低油菜籽试验为4.2吨/公顷（0.7-6.2吨/公顷）。对N和P的响应最频繁，其次是对S和K的响应。对Cu或Zn没有明显的正响应。在整个实验中，小麦中Colwell P的95％临界值为52 mg / kg，95％置信区间为39–68 mg / kg。对于双低油菜籽，临界值为59 mg / kg，范围为38–139 mg / kg。这些数值高于澳大利亚较低降雨地区的数值。钾和硫的临界值也高于澳大利亚较干旱地区的临界值。在多种营养限制条件下，最小高估产量的斯普林格尔-莱伯格定律，而在这些条件下，等效产品定律低估了产量。基于HRZ的证据，这些较高的临界值有望帮助缩小该地区小麦和低芥酸菜籽的单产差距。在多种营养限制条件下，最小高估产量的斯普林格尔-莱伯格定律，而在这些条件下，等效产品定律低估了产量。基于HRZ的证据，这些较高的临界值有望帮助缩小该地区小麦和低芥酸菜籽的单产差距。在多种营养限制条件下，最小高估产量的斯普林格尔-莱伯格定律，而在这些条件下，等效产品定律低估了产量。基于HRZ的证据，这些较高的临界值有望帮助缩小该地区小麦和低芥酸菜籽的单产差距。