Effects of Mowing and Topdressing of Nitrogenon Photosynthetic Characteristics in Triticale
The photosynthetic physiological indexes after heading and their relationships under different mowed and fertilized N treatments in Triticale (Zhongsi237) were studied. The results showed that the curve of Chlorophyll (a+b) within the flag leaves after heading under different treatments displayed only one peak, and content of Chlorophyll (a+b) under N treatment was higher than that of unfertilized ones. The peaks of net photosynthetic rate (P_n) under different treatments after heading appeared in almost the 18th day after heading, and P_n remained high for quite a long time, but their descending speed showed difference. The changes of FLAR under different treatments were the same as those of P_n, except treatmentⅡ,Ⅲ. Although treatment Ⅱhad advantages in P_n, the FLAR were low, and its flag leaves of single plant assimilated less nutrient substances. There was negative correlation at extremely significant level between P_n and FLA, and a positive correlation at significant level between Chlorophyll (a+b) and P_n.