| The six years "JiZui" litchi was applied as the plant materials in field experiment. The plants were treated with different concentration PP333 and Eth in the leaves. The main purpose of the experiment is to research the efforts of PP333 and Eth on flower bud differentiation of Litchi and the relations between flower bud differentiation and the endogenous hormones, C/N, nutrient elements, resolve the question of low flower bud differentiation ratio and low fruit-set ratio, find a kind of effective means for "JiZui" Litchi culture management. The main results were as follows:1. Different treatments of PP333 and Eth could promote the follower bud formation of Litchi. Among those four treatments, the treatment A(800mg/kg Eth) got the best result, the flower bud differentiation achieve to 91.88%, which has improved by 18.59% than that of the control; treatment D (600mg/kg PP333), C (400mg/kg ETH) and B (1000mg/kg PP333) were the better, flower bud differentiation rates were 81%, 80. 44% and 76. 37% respectively. It has improved by 18.52%, 7.15%, 3.08% respectively compare to the control. Square difference analysis shows that expect treatment B, the difference between treatments and control reached significant level.2. Treatment took a remarkable effectiveness on physiological differentiation time. It prolonged the time obviously than cons tract. Among them, treatment A and B was 45 days and 46 days respectively. They have prolonged 5 days and 6 day than that of control respectively. Treatment B and C prolonged 2 days and 3 days than control respectively. However, the control completed the flower bud differentiation need 40 days. On the period of morphological differentiation, the difference between treatments and control unremarkable. On blooming period, treatment could prolong the time of female flower blooming. Among them, treatment A, D and C prolonged 4 days, 3 days and lday than that of control respectively on the period of female flower blooming.3. Different treatment restrained the flower spike length remarkable. Treatment A, B, C and D decreased by 20.39%, 5.26%, 10.53% and 22.37% respectively compare to the control on flower spike length. Among those four treatments, the female/male ratio of treatment A was the highest, the treatment D, C and B were the better. As to the fruit-set ratio, treatment A, B, C, D were 11.3%, 3.9%, 3.6% and 8.4% higher than the control respectively. Among them, treatment A was the highest, the treatment B was the lowest.4. Different treatment took obvious effectiveness on average Spike number of each tree, average fruit number of each spike, single fruit weight and output of each tree. Excepttreatment B was below than control, treatment A, C and D had improved 75.31%. 37.95% and 22.90% respectively than that of the control on average spike number of each tree. On the aspect of average fruit number of each spike, treatment A, C and D increased 1.17, 0.34 and 0.84 respectively than that of the control. On the aspect of output of each tree, treatment A,C and D were 7.61kg, 1.93kg, 4.46kg higher respectively than that of the control. Treatment B was 0.93kg lower than the control. As for the single fruit weight, treatment A, B, C, D increased 4.62kg, 0.08, 1.93kg, 4.67kg compare to the control.5. Experiment results show: on the period of physiological differentiation, treatments decreased the content of 1AA and GA3 in leaves obviously and increased the content of ABA and ZTR remarkable. Among those four treatments, treatment A and D were more effective than treatments B and C. On the early stage of morphological differentiation, all of the content of 1AA, GA3, ABA and ZTR had an increasing peak. On the middle and late stage of morphological differentiation, except the content of GA3 had fluctuated, the content of IAA, ABA and ZTR was decreased continuously. On the early stage of morphological differentiation, the content of IAA, GA3, ZTR and ABA increased at the same time which was good to the flower bud differentiation and improvement the flower quality.6. On the period of flo... |
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