| With three genotypes of spring wheat as experimental materials,the fertilization experiment was conducted to investigate the effects of different levels and ratios of nitrogen and phosphorus on the milling quality traits of spring wheat,including 1000-grain weight,bulk weight as well as extraction rates of all sorts of flour.The results showed that there are significant differences of grain bulk weight,core flour extraction rate and total flour extraction rate among the fertilization treatments.The bulk weight and total flour extraction rate were more sensitve to nitrogen and phosphorus supply than 1000-grain weight.With the enhancement of nitrogen and phosphorus level and ratio,the 1000-grain weight of different genotypes varied little generally,while the bulk weight decreased significantly and the total flour extraction rate increased significantly.The core flour extraction rate of all genotypes dropped significantly with the increase of nitrogen supply,but rised markedly with the increase of phosphorus supply;however,the coat flour extraction rate of different genotypes vary dissimilarly with the addition of nitrogen and phosphorus supply.The effects of nitrogen and phosphorus supply on 1000-grain weight,bulk weight and extraction rate of all sorts of flour differed obviously for different genotypes.The 1000-grain weight and bulk weight of strong gluten cultivars were influenced easily by nitrogen level,but those of middle and weak gluten cultivars were influenced easily by phosphorus level.The core flour extraction rate and total flour extraction rate of strong gluten genotypes were more easily affected by nitrogen and phosphorus level and ratio than those of middle gluten genotypes,while the coat flour extraction rate of weak gluten genotypes was more easily affected.It was concluded that the milling quality traits of spring wheat could be improved distinctly by properly increasing nitrogen and phosphorus supply. |