Remote sensors permit forecasting the nutrient status and yields in crops of economic importance in Colombia. The objective of this study was to determine the relationships between normalized difference vegetation index (NDVI) and yield as well as concentrations of ${\rm {N - NO}}_3^ - $ and K+ in stem sap of potato cultivars Diacol Capiro and Pastusa Suprema (Solanum tuberosum L., Group Andigenum) in relation to different fertilizer rates. Increasing doses (0, 1450, 1900 and 2375 kg ha–1) of macro- and micronutrient fertilizers were applied to determine NDVI behavior at 55, 75, 100, 125 and 150 days after planting. For Capiro, significant differences in NDVI readings (0.84–0.88) were found between phenological stages. In both cultivars, NDVI correlated positively with yield and K+ concentrations in stem sap during tuber filling and maturation, while in Capiro no correlation was established between NDVI values and ${\rm {N - NO}}_3^ - $ concentrations in stem sap. The NDVI readings could be used to forecast productivity and K status in potato Group Andigenum.

中文翻译：

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受施肥影响的马铃薯植物 (Group Andigenum) 茎液中的归一化差异植被指数和 K+

遥感器可以预测哥伦比亚具有经济意义的作物的营养状况和产量。本研究的目的是确定归一化植被指数（NDVI）与产量和浓度之间的关系。${\rm {N - NO}}_3^ - $和 K+在马铃薯栽培品种 Diacol Capiro 和 Pastusa Suprema 的茎汁中（马铃薯L., Group Andigenum) 与不同施肥量的关系。增加剂量（0、1450、1900 和 2375 kg ha–1) 施用大量和微量营养素肥料以确定种植后 55、75、100、125 和 150 天的 NDVI 行为。对于 Capiro，在物候阶段之间发现了 NDVI 读数（0.84-0.88）的显着差异。在两个品种中，NDVI 与产量和 K 呈正相关+在块茎灌浆和成熟过程中茎液中的浓度，而在 Capiro，NDVI 值和${\rm {N - NO}}_3^ - $茎汁中的浓度。NDVI 读数可用于预测马铃薯组 Andigenum 的生产力和 K 状态。