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- W2005068778 abstract "Polymer‐coated urea (PCU) is used in potato ( Solanum tuberosum L.) production to maintain or improve tuber yield while minimizing N losses, but the mode of N release is different from conventional soluble N sources. Hence, it is not known how soil‐ and plant‐based indices of N availability would perform in response to PCU application. A 3‐yr study was conducted on a sandy‐loam soil in Quebec, Canada, to examine the effect of PCU application rate (0, 60, 120, 200, and 280 kg N ha −1 ) on petiole NO 3 –N concentrations, chlorophyll meter readings (SPAD readings), soil mineral N content, and total tuber yield. Nitrate availability throughout the growing season was monitored by measuring NO 3 adsorbed by anion exchange membranes (NO 3AEM ). The NO 3AEM values, petiole NO 3 –N concentrations, SPAD readings, soil mineral N content, and total tuber yield increased with PCU application rate. The NO 3AEM values fluctuated during the growing season due to plant N uptake and variations in soil moisture content. Using all the PCU rates across years, we found that relative yield was better related to petiole NO 3 –N concentrations measured at 45 to 50 d after planting (DAP) ( R 2 = 0.95) and to cumulative NO 3AEM values measured up to 49 DAP ( R 2 = 0.91) than soil mineral N ( R 2 = 0.67), soil NO 3 –N ( R 2 = 0.65), and SPAD readings ( R 2 = 0.53) measured at 45 to 50 DAP, respectively. This study showed that soil‐ and plant‐based indices of N availability can be used as early indicators of yield response in potato fertilized with PCU." @default.
- W2005068778 created "2016-06-24" @default.
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- W2005068778 date "2014-11-01" @default.
- W2005068778 modified "2023-10-02" @default.
- W2005068778 title "Soil‐ and Plant‐Based Indices in Potato Production in Response to Polymer‐Coated Urea" @default.
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- W2005068778 doi "https://doi.org/10.2134/agronj14.0041" @default.
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