为适时精确诊断赣花7号的氮素营养状况，通过设置6个氮素水平（施纯氮0、75、150、225、300、375 kg/hm2），在不同时期（出苗后30、45、60、75和90 d）分别测定花生不同叶位（主茎倒一完全叶、倒二完全叶和倒三完全叶）的SPAD值和相应叶位叶片的含氮量，分析其施氮水平、SPAD值和叶片含氮量之间的关系，并进行方程的拟合。结果显示：施氮水平与SPAD值、叶片含氮量之间呈显著的指数相关，SPAD值和叶片含氮量之间呈显著的线性相关，并且在各叶位中，以主茎倒3叶的相关性最好，其可作为氮素诊断的理想叶位。
In order to timely and accurate diagnosis nitrogen status of Ganhua No.7, an experiment was conducted under six different nitrogen levels (0, 75, 150, 225, 300, 375 kg/hm2), and SPAD value and N content of peanut leaves from different positions were measured at five different stages (after seeding 30, 45, 60, 75 and 90 d) were determined, and the relationship between nitrogen level, SPAD value and leaf nitrogen content was analyzed. The results showed that: the relationship between nitrogen application rate and SPAD value and leaf nitrogen content was significantly index － related, while relationship between SPAD values and leaf nitrogen content was significant linear － related. The clearest relationship existed in the third complete leaf from the top, so it could be used as the optimal leaf in nitrogen nutrition diagnosis.