Abstract:

To understand the relationship between SPAD, chlorophyll and protein content, SPAD, chlorophyll and protein content were measured and compared in 10 ryegrass varieties. At the same time, the correlation between the SPAD and chlorophyll, protein content were analyzed. The results showed that, SPAD value, chlorophyll and protein content in the 10 ryegrass varieties were significant. The varieties of A25 and A22 were superior to the others in the 3 traits SPAD values, chlorophyll and protein content. There was significant linear correlation between SPAD value and chlorophyll content, protein content in the 10 ryegrass varieties. The results provided the basis to judge the content of chlorophyll and protein by SPAD.