大麦品种的改良．仅仅是在某些性状方面的改优。各不同阶段的品种，置于相同适宜的栽培条件下，产量差异较小，产量提高的关键在栽培技术。一旦栽培条件与品种特性要求不相一致，产量差异往往较大。将感病品种种植病因，产量会大幅度减少甚至绝收。品种的不断更新，是由于原有品种的某些优良特性经过连续种植、逐渐过化并丧失，如抗病变为患病，矮杆变为高杆等，品种能被不断更新的另一个原因则是用途发生了变化。 Barley varieties improved. Merely in some traits improvement. The different stages of the varieties, placed under the same suitable cultivation conditions, the yield difference is small, the key to increase the yield in cultivation techniques. Once the cultivation conditions and species characteristics do not meet the requirements, the output difference is often larger. Will be susceptible varieties of etiology, production will be significantly reduced or even off. Varieties continue to update, due to some of the fine varieties of the original species after continuous planting, gradually over and lost, such as disease-resistant disease, dwarf into pole and so on, the species can be constantly updated another reason It is the use of change.