Effects Of Fertilizers Of Diferent NPK Ratios And Applying Times On The Yield And Quality In Pitaya

Pitaya as an emerging industry of fruit trees, its large-scale commercial cultivation started a late. Compared to other fruit tree industry, research reports are few. There are still many problems in many aspects. For example, variety selection, pollination, fertilization technology and other aspects are worthy to be further research and should be the perfect place. Therefore, with3year old red skin and meat pitaya as test materials, using the treatments of diferent NPK ratios and applying times, were measured and compared to the yield, quality and changes of nutrient elements on the different treatments. It was expected to look for a good NPK ratios and applying times, and provide a reference for dragon fruit production. The results are as follows:1Different fertilization treatments on red pitaya fruit number per plant and the weight have obvious effect, which the most obvious effects atre treatment A and D. Compared with the control, fruit numbers per plant of treatments A and D were increased by8.03%and0.73%respectively. The single fruit weight was increased by14.36%and15.02%respectively. Average fruit weight of treatment A reached367.22g, and fruit number per plant reached49. The results indicated that improving amount of nitrogen fertilizer on fruit weight and number per plant in pitaya had obvious effect. Analysis of variance showed that fruit weight reached extremely significant difference level, but the fruit number per plant was no significant difference. Analysis of variance showed that2. Different fertilization treatments on the internal quality of pitaya fruit has obvious effect, which A treatment has the most significant effect on the content of soluble sugar, soluble protein, total soluble solid and titratable acid, which their content reached69.28mg/g,2.35mg/g,13.23%,0.13%and9.18mg/100g respectively. Analysis of variance showed that all of them reached extremely significant difference level.3. At different growth stages of Pitaya, the nitrogen, phosphorus, potassium, calcium, magnesium and other nutrient elements have different absortion contents, and have a great effects on the yield and quality of fruit. The results show that the maximum period of nitrogen demand is in the middle of May and late July, phosphorus is in the middle of May, potassium is in the middle of May, calcium and magnesium is in the late July.4. Different fertilization treatments have different effects on the content of organic matter, available nitrogen, phosphorus, potassium, calcium and magnesium and pH value on soil. From the function to increase production and maintain the balance of soil elements, content of major nutrients in the treatment A on soil is conducive to maintaining the balance of soil elements.5. In summary, the better NPK formula fertilizer of the effect on the yield and quality of pitaya fruit are organic matter15Kg, N0.18Kg, P2O50.18Kg and K2O0.18Kg per column, and fertilizing cycle period is fertilization one time every three months. On this basis, the appropriate increasing application amount of organic fertilizer and calcium fertilizer is more conducive to maintain the balance relationship between soil nutrient elements and production.