In New Zealand, potato crop yields of 90 t ha⁻¹ are achievable but at 55 t ha⁻¹, the average is becoming economically unsustainable. In 2012/13, a grower-initiated survey found that Rhizoctonia solani and Spongospora subterranea (soil-borne pathogens) and soil compaction were widespread in 11 Canterbury potato crops. Targeted areas in these crops had measured yield losses of 0 (healthy plants) – 42 (diseased, resource constrained plants) t ha⁻¹, limiting the farmer-measured field yield to a 56 t ha⁻¹ average. In 2014/15, growth, water use and health of three contrasting crops were measured. Near-potential yield was achieved in one crop when disease incidence and severity were low and resources adequate. The other two crops yielded less than potential; one had an inadequate water supply and the other widespread soil-borne disease. Any suspected links between soil-borne disease, soil compaction and yield were further investigated by using them as factors in replicated experiments reported elsewhere.

在新西兰，90 t ha ^-1的马铃薯作物产量是可以实现的，但 55 t ha ^-1的平均产量在经济上变得不可持续。2012/13 年度，一项由种植者发起的调查发现，在坎特伯雷的 11 种马铃薯作物中普遍存在立枯丝核菌和地下海绵孢菌（土壤传播的病原体）和土壤板结现象。这些作物的目标区域测得的产量损失为 0（健康植物）– 42（患病、资源受限的植物） t ha ^-1，将农民测量的田间产量限制为 56 t ha ^-1平均的。在 2014/15 年度，测量了三种对比作物的生长、用水和健康状况。当疾病发病率和严重程度较低且资源充足时，一种作物可实现近潜在产量。其他两种作物的产量低于潜力；一个供水不足，另一个是广泛传播的土传疾病。通过将它们用作其他地方报道的重复实验的因素，进一步研究了土传疾病、土壤压实和产量之间的任何可疑联系。