Critical nitrogen dilution curve for processing potato in Argentinean Humid Pampas

摘要: For processing potato, a new algorithm has been developed to determine nitrogen (N) requirement (NR) applying critical N dilution curve (Nc). The objectives of this work were i) the Nc for potato under growing conditions Argentinean Humid Pampas; ii) compare parameters with those obtained by other authors, and iii) establish crop NR. experiments carried out during four seasons. cultivar Innovator was planted in randomized complete block design treatments. Dry matter yield concentration shoots tubers measured season. determined selecting data points which highest total biomass (W), comprised tubers, expressing as function W. nutrition index (NNI) ratio between actual (Na) Nc. NR difference uptake uptake, divided utilization efficiency. A fitted (Nc = 5.30 W–0.42, R2 0.92) presented similar values than published reference relation relative tuber (RY) NNI expressed linear-plateau accounted 69% variation. ≥ 1 RY near 98.7%. With decreasing below decreased. 66% 0 98%. NR, 0, Furthermore, increased linearly increasing indicates that 0.99 when zero. This study shown can be applied systems. calculated from is reliable indicator stress level potato’s enable calculation