Effects of nitrogen fertilizing on the leaf chlorophyll content and fresh forage yield of Lolium multiflorum cv. Tetragold

Effects of different nitrogen fertilizing levels on leaf SPAD value, chlorophyll content and fresh forage yield of Lolium multiflorum cv. Tetragold were evaluated through a field trail. Further, correlations between the chlorophyll content and SPAD value, the chlorophyll content and fresh forage yield, and the SPAD value and fresh forage yield were also studied. The results showed that increasing nitrogen fertilizer application significantly improved the SPAD value, chlorophyll content and fresh forage yield of L.multiflorum cv. Tetragold. The correlations analysis indicated that there were significant positive correlations between the SPAD value and the chlorophyll content, the chlorophyll content and the fresh forage yield, and the SPAD value and the fresh forage yield. The correlation coefficients (r) were 0.954 9, 0.911 4 and 0.923 8, respectively.