通过生产实践和实验资料分析看出,增加土壤氮素水平是提高小麦品质的重要手段,苜蓿茬小麦粗蛋白质含量较连茬高51.4％。降水对品质的影响主要是收获前霖雨引起的穗发芽和霉变,生育期降水超过499mm对品质就有影响。从生态区来看,陕北、渭北旱作麦区小麦蛋白质含量与籽粒容重优于水浇地。 Through the analysis of production practice and experimental data, we can see that increasing soil nitrogen level is an important means to improve the quality of wheat. The crude protein content of alfalfa wheat is 51.4% higher than that of continuous cropping. Precipitation on the quality of the main effect is caused by rain before harvest spike germination and mildew, the growth period of more than 499mm precipitation have an impact on the quality. From the ecological point of view, northern Shaanxi, wheat crop area of ​​wheat Weibei wheat protein content and grain weight is better than irrigated.