Nitrogen nutrition and wheat growth in relation to absorbed solar radiation

During two growing seasons (1980–1982), the influence of nitrogen fertilizer on the growth of winter and spring wheat was assessed. An analysis was devised which related grain yield to harvest index, mean daily incident irradiance, the duration of the growing season, fraction of radiation absorbed by the foliage (f), the efficiency of conversion of absorbed radiation into biomass (ε) during vegetative growth (εm), and the influence of the...