施氮对多花黑麦草叶片叶绿素和鲜草产量的影响

在大田条件下研究了不同施氮水平对特高多花黑麦草(Lolium multiflorum cv.Tetragold)叶片SPAD值、叶绿素含量和鲜草产量的影响，并探讨了叶绿素含量与SPAD值之间，叶绿素含量、SPAD值与鲜草产量之间的相关关系。结果表明，增施氮肥能显著提高特高多花黑麦草叶片的SPAD值、叶绿素含量和鲜草产量。相关分析表明，叶片SPAD值与叶绿素含量之间、叶绿素含量与鲜草产量之间以及SPAD值与鲜草产量之间均呈显著正相关关系(P<0.05)，相关系数分别为0.954 9、0.911 4和0.923 8。

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.