The effects of plant density, the application amount and basal: top dressing ratio of nitrogen fertilizer on the characteristics of grain nutritional and processing quality formation and the relationship between carbon-nitrogen metabolism and grain quality of weak gluten wheat variety Ningmai 9 (Tr. aestivum L.) were studied on the experiment field of Crop Cultivation and Physiology Key Laboratory of Jiangsu Province, Yangzhou University in 2000-2002. The approach of quality control by cultivati...