Abstract One of the challenges of potato (Solanum tuberosum L.) production is to minimize phosphorus (P) fertilization without negatively affecting the yield progress. Therefore, critical P dilution curves [Pc = acW−b; where Pc is the critical P concentration (%); ac is the critical plant P concentration (%) for a total dry matter (DM) biomass of 1 Mg ha-1; W is the total DM biomass expressed in Mg ha-1; and coefficient b is dimensionless and represents the ratio between the relative decline in plant P concentration and the relative crop growth rate] have been developed recently to improve P fertilization management in potatoes. The aim of this study was to test critical P dilution curves for potato cultivated in Sao Paulo State, southeastern Brazil. Nine field experiments were conducted in Oxisols with Presin values ranging from 8 to 70 mg dm-3 (very low to high). In each experiment, treatments were different P rates (ranging from 0 to 448 kg P ha-1) or the combination of different cultivars and P rates. Wide ranges in tuber DM yield (0.7-7.9 Mg ha-1) and plant P concentration (0.13-0.36 %) were observed before vine killing in response to P rates, cultivars, and site-years. Tuber DM yields were related to total DM biomass (R2 = 0.98), while P uptake was related to both total DM biomass and total plant P concentration (p

中文翻译：

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测试在巴西东南部热带氧化土壤中种植的马铃薯的临界磷稀释曲线

摘要 马铃薯 (Solanum tuberosum L.) 生产的挑战之一是尽量减少磷 (P) 施肥，而不会对产量进程产生负面影响。因此，临界 P 稀释曲线 [Pc = acW-b; 其中 Pc 是临界 P 浓度 (%)；ac 是 1 Mg ha-1 总干物质 (DM) 生物量的临界植物磷浓度 (%)；W 是总 DM 生物量，以 Mg ha-1 表示；系数 b 是无量纲的，代表植物磷浓度的相对下降与相对作物生长速度之间的比率]最近被开发用于改善马铃薯的磷肥管理。本研究的目的是测试巴西东南部圣保罗州种植的马铃薯的临界磷稀释曲线。在 Oxisols 中进行了九次现场实验，Presin 值范围为 8 到 70 mg dm-3（从非常低到高）。在每个实验中，处理是不同的 P 比率（范围从 0 到 448 kg P ha-1）或不同品种和 P 比率的组合。在杀死葡萄藤之前观察到块茎 DM 产量 (0.7-7.9 Mg ha-1) 和植物 P 浓度 (0.13-0.36%) 的范围很宽，以响应 P 率、栽培品种和地点年。块茎干物质产量与干物质总生物量有关 (R2 = 0.98)，而磷吸收与干物质总生物量和植物总磷浓度有关 (p 36 %) 是在藤蔓杀死前观察到的，以响应 P 率、栽培品种和地点年。块茎干物质产量与干物质总生物量有关 (R2 = 0.98)，而磷吸收与干物质总生物量和植物总磷浓度有关 (p 36 %) 在藤蔓被杀死之前观察到，以响应 P 率、栽培品种和地点年。块茎干物质产量与干物质总生物量有关 (R2 = 0.98)，而磷吸收与干物质总生物量和植物总磷浓度有关 (p