Influence of Suppling Fertilizers on Trace Element Content and Photosynthesis of Tea Leaves (Camellia Sinensis)
Tao Hanzhi Cheng Suzhen Zhang Heying (Anhui Agriculture College, Hefei)
Effects of suppling urea (N), superphosphate (P), and rapecake on traceelement (Mn, Zn, Cu, B) contents and net photosynthetic rate (Pn) of tea leaves were studied. Results indicate that contents of Cu and Zn were lower in leaves than in shoots, but Mn and B showed the opposite. Leaf Mn was higher in P treatment than that in rapecake, leaf Mn appeared highest in N treatment, next was in N+P, and lowest in rapecake. Leaf—Zn was lower in either P or N suppling than those in N+P, rapecake, and control treatments. Applying P or N coused a depression of leaf—Cu, rapecake increased shoot—Cu content. Tea bushes provided with P turned out a higher leaf—B than other leaf—traceelements. No significant correlation was fount between Mn and B, Zn in leaves and shoots, but there are negative correlation of Mn to Cu (r=-0.612, α=0.20; or r=-0.774, α=0.10), and positive correlation of leaf—Cu to leaf—Zn(r=0.861, α=0.025), negative correlation of shoot—Cu to shoot—Zn (r=0.829, α=0.05). Results reveal that there was no significant difference between N+P and N treatments to Pn. But Pn in these two treatments was higher than that in rapecake, P and control treatments. A linear relationship between Pn and specific leaf weight (SLW) or chlorophyll content was also observed. Pn presented positive correlation to Mn content with a r=0.843, α=0.05, but there were no with other trace element (Cu, Zn, B).