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- W3000403550 abstract "Abstract Potato ( Solanum tuberosum L.) tuber sink strength is determined by the maximum nitrogen concentration (N cmax ) in the tuber within the growing season. This hypothesis was verified based on data from two seasons with contrasting weather conditions, that is, the wet 2007 and the dry 2008. A field experiment, including four levels of nutrients: absolute control (AC), NP, NPK, and NPKMgS, was the basis of the hypothesis evaluation. Vines and tubers were collected periodically at 10–11 d intervals in 10, and nine consecutive samplings, respectively. Tuber yield growth was described by the linear and polynomial functions under favorable and unfavorable growth conditions, respectively. The polynomial functions indicated lower tuber yields (+20 t ha– 1 for NPK vs. NP in 2007). The N cmax of the growing tuber is the key yield driver, defining the tuber sink capacity. As compared to the in‐season variability in N a (N accumulated in vines–source capacity), the N cmax was a conservative trait, up‐regulating the source activity. The narrowed N/P from 5.9 to 2.1, but from 4.6 to 1.9 and for N/Mg from 26 to 12, but from 22 to 14, respectively in 2007 and 2008, increased the steepness of the N c during its descending course. The tuber sink capacity can be fulfilled, provided there is a good supply of K during potato bulking. It can be concluded that the higher the N cmax , the higher the potato requirement for K. Any factor lowering the N cmax simultaneously decreases the potato requirement for K, subsequently leading to yield losses." @default.
- W3000403550 created "2020-01-23" @default.
- W3000403550 creator A5031734117 @default.
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- W3000403550 date "2020-02-20" @default.
- W3000403550 modified "2023-10-06" @default.
- W3000403550 title "The in‐season nitrogen concentration in the potato tuber as the yield driver" @default.
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- W3000403550 doi "https://doi.org/10.1002/agj2.20000" @default.
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