[Effects of row spacing and sowing rate on vertical distribution of photosynthetically active radiation, biomass, and grain yield in winter wheat canopy.].

To clarify the effects of row spacing and sowing rate on the vertical distribution of canopy PAR, biomass, and grain yield in winter wheat, a field experiment was conducted without increa-sing water and fertilizer input. There were two row spacing modes, R (equal spacing, 20 cm+20 cm) and R(wide and narrow row spacing, 12 cm+12 cm+12 cm+24 cm), and three sowing rates, D (low, 120 kg·hm), D (medium, 157.5 kg·hm), D (high, 195 kg·hm).