GUO Rong, GONG Yifu, JIANG Jie, YU Kai, CHEN Haimin, WANG Heyu, YAN Xiaojun
In order to explore the effects of new seaweed bio-fertilizer on the growth, yield and quality of pitaya, a kind of pitaya named Shuijing, introduced from Taiwan, was sprayed with different concentration of new seaweed bio-fertilizer on the foliage\|spring water as a control. After spraying, the yield of pitaya was measured and the weight, volume, diameter, longitudinal diameter, total soluble solid(TSS), titratable acid(TA), sugar and acid ratio and Vc content were determined. The results showed that the new seaweed bio-fertilizer 1 000 times dilution and 1 500 times dilution could improve the yield and quality of the pitaya. Under the treatment of the 1 000 times dilution, the average weight (309.77 g), volume (390.71 cm3), diameter (11.62 cm) and longitudinal diameter (7.82 cm) of fruit reached to the highest, which were 42.00%, 39.20%, 9.10% and 21.80% higher than that of the control, respectively. At the same time, the content of total soluble solids of pitaya reached to the highest (9.63%), which was 28.90% higher than that of the control (7.47%), sugar and acid ratio (55.56) increased significantly, which was 65.70% higher than that of the control group, and the Vc content (10.71 mg·100 g-1) was increased by 23.30% compared with the control group 7.69 mg·100g-1, but the titratable acid content (0.17%) decreased significantly. When the fertilizer was 1500 times diluted, the fruit number of the pitaya reached 89.60 per pile (four strains), which was 40.00% higher than that of the control. Compared with the control group, the yield of the pitaya was the highest (2 894.88 kg·667 m-2), which increased by 1 345.32 kg·667 m-2. It also improved the growth and quality, such as the average weight (291.07 g), volume (359.00 cm3) and total soluble solids of pitaya (8.90%), which were 33.40%, 27.90% and 19.10% higher than that of the control, respectively. This study provides a theoretical basis for the large-scale production and application of the new seaweed bio-fertilizer.