Effects of different fertilization treatments on photosynthetic characteristics of leaf and seedling ;growth of Bombax ceiba
Different applying amounts and proportions of nitrogen, phosphorus and potassium fertilizers﹝applying amount per plant of 2. 0, 4. 0, 6. 0, 8. 0 and 10. 0 g CO(NH2)2, 4. 0, 6. 0, 8. 0, 10. 0 and 12.0 g Ca(H2PO4)2, 0. 6, 1. 2, 1. 8, 2. 4 and 3. 0 g KCl, respectively﹞ were set up by L25(53) orthogonal experimental design, and different applying amounts of compound fertilizer ( applying amount per plant of 10, 20, 30, 40 and 50 g, respectively ) were also set up, changes in photosynthetic characteristics indexes ﹝including net photosynthetic rate ( Pn ) , water use efficiency ( WUE ) , the maximum photochemical efficiency of PSⅡ ( F v/F m ) and chlorophyll relative content ( SPAD )﹞ of leaf and seedling growth indexes ( including increments of height, ground diameter and leaf area) of Bombax ceiba Linn. seedling after fertilization from the first to the third month were compared. The results show that in general, Pn and WUE values of leaf of B. ceiba seedling in different fertilization treatments increase, and increments of seedling height, ground diameter and leaf area increase, but effects of different fertilization treatments on Fv/Fm and SPAD values of leaf are small. Effect of compound fertilizer on leaf photosynthetic characteristics and seedling growth is also small. After fertilization from the first to the third month, Pn and WUE values of leaf of seedling in treatment groups with applying amount per plant of 4. 0 or 6. 0 g nitrogen fertilizer, 4. 0 or 8. 0 g phosphorus fertilizer, 1. 2, 1. 8 or 3. 0 g potassium fertilizer are significantly higher than those in the control ( no fertilizer ) and most treatment groups. Increments of height, ground diameter and leaf area of seedlings in treatment groups with applying amount per plant of 4. 0 or 6. 0 g nitrogen fertilizer, 4. 0-12. 0 g phosphorus fertilizer, 1. 2-3. 0 g potassium fertilizer are also high. The result of comprehensive analysis indicates that effect of nitrogen fertilizer on photosynthetic characteristics and growth of B. ceiba seedling is the largest, that of potassium fertilizer takes the second place, and that of phosphorus fertilizer is the smallest. Comprehensively considering on Pn value, WUE value and increments of height, ground diameter and leaf area, the suitable applying amount per plant at seedling stage of B. ceiba is 1. 84 or 2. 76 g N, 0. 72-2. 16 g P2 O5 and 0. 72-1. 80 g K2 O.
Bombax ceiba Linn.fertilization levelfertilizer proportionphotosynthetic and physiological characteristicsseedling growth
NETL
NSTL
万方数据
维普
