Effect of nitrogen supply on leaf growth, leaf nitrogen economy and photosynthetic capacity in potato

摘要: Abstract Literature reports show little effect of nitrogen supply on radiation use efficiency in potato and other dicotyledonous C3 species. This paper tests the hypothesis that reduces leaf size rather than concentration photosynthetic capacity when is short supply. Four pot experiments with different rates were conducted glasshouses. For two numbers measurements made area, Pmax (rate photosynthesis for saturating irradiance), specific weight, concentrations total nitrate, all as a function age. Area per was sensitive to (about factor 3 between extreme N treatments). declined There no systematic effects its change age, except some cases leaves high treatments lower low during part life span (leaf age ca. 20–50 days). The dominant not or content. versus areal organic (g N m−2 area) showed considerable scatter and, given concentration, slightly treatments. Comparison species comparatively value potato.