Increased plant density of winter wheat can enhance nitrogen–uptake from deep soil

Increased plant density improves grain yield and nitrogen (N)–use efficiency in winter wheat (Triticum aestivum L.) by increasing the root length density (RLD) in the soil and aboveground N–uptake (AGN) at maturity. However, how the root distribution and N–uptake at different soil depths is affected by plant density is largely unknown. A 2–year field study using the winter wheat cultivar Tainong 18 was conducted by injecting 15 N–labeled urea...