Welcome to Chinese Journal of Tropical Crops,

Chinese Journal of Tropical Crops ›› 2021, Vol. 42 ›› Issue (10): 2909-2914.DOI: 10.3969/j.issn.1000-2561.2021.10.022

• Plant Cultivation, Physiology & Biochemistry • Previous Articles     Next Articles

Effects of Different Phosphorus Supply Levels on the Growth and Nutrient Absorption of Pitaya Seedlings

CHEN Chen1, YANG Yongzhi1, GAN Liang1, LYU Liewu2, GAO Wei1,*(), RUAN Yunze1   

  1. 1. College of Tropical Crops, Hainan University, Haikou, Hainan 570228, China
    2. Hainan Provincial Soil and Fertilizer General Station, Haikou, Hainan 570203, China
  • Received:2020-12-28 Revised:2021-02-08 Online:2021-10-25 Published:2021-11-25
  • Contact: GAO Wei


Pitaya is an important economic crop in tropical regions, and its planting scale has been expanding in recent years. However, research on the absorption and response of pitaya to phosphorus is still extremely scarce. In this study, ‘RuanZhi’ pitaya in potted planting was used to explore the appropriate phosphorus supply concentration of pitaya seedlings by analyzing the changes in root morphology and nutrient uptake of pitaya seedlings under different phosphorus levels. The amount of phosphorus added in the experiment was 0 mg/kg, 25 mg/kg, 50 mg/kg, 100 mg/kg. 200 mg/kg. The aboveground biomass of the seedlings at the phosphorus supply level of 25 mg/kg and 50 mg/kg was 37.1 g/plant and 36.2 g/plant, which was significantly higher than that of other treatments. Phosphorus supply level did not affect the absorption of above-ground phosphorus and potassium, but when the phosphorus supply level was 50 mg/kg, the nitrogen absorption was significantly higher than that of the phosphorus supply level 0 mg/kg, 100 mg/kg, and 200 mg/kg processing. The total root length of the seedlings at the phosphorus supply level of 25 mg/kg and 50 mg/kg was 1068.8 cm and 1069.6 cm, which was significantly higher than that of the other treatments., The root surface area of the phosphorus supply level of 50 mg/kg was significantly higher than that of the treatments of 0 mg/kg and 200 mg/kg. The content of soil alkali-hydrolyzable nitrogen was significantly negatively correlated with total root length and root surface area, indicating that the phosphorus supply level indirectly affected the nitrogen absorption of pitaya seedings by affecting root growth. In summary, phosphorus supply level at 50 mg/kg could improve the root morphology of pitaya seedlings and promote the absorption of nitrogen by seedlings.

Key words: pitaya, phosphorus, root morphology, nutrient absorption

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