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

doi:10.3969/j.issn.1000-2561.2021.10.022

Abstract

Abstract:

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

CLC Number:

S667.9

CHEN Chen, YANG Yongzhi, GAN Liang, LYU Liewu, GAO Wei, RUAN Yunze. Effects of Different Phosphorus Supply Levels on the Growth and Nutrient Absorption of Pitaya Seedlings[J]. Chinese Journal of Tropical Crops, 2021, 42(10): 2909-2914.

Figures/Tables 8

Tab. 1 Pitaya seedling biomass and plant height under different phosphorus supply levels

供磷水平 P level/(mg·kg^?1)	地上部生物量Aboveground biomass/g	植株高度 Plant height/cm
0	29.0±1.9^c	38.7±1.5^b
25	37.1±1.6^a	45.0±2.0^b
50	36.2±2.0^a	57.6±4.9^a
100	33.0±1.2^b	46.0±2.2^b
200	31.6±0.3^bc	40.3±1.1^b

Fig. 1 Nitrogen, phosphorus and potassium uptake of pitaya seedlings under different phosphorus supply levels Different lowercase letters indicate that the absorption of nitrogen, phosphorus, and potassium varies significantly between different P supply levels (P<0.05).

Tab. 2 Total root length and root surface area of pitaya seedlings under different phosphorus levels

供磷水平 P level/(mg·kg^?1)	总根长 Total root length/cm	根表面积 Root surface area/cm²
0	496.7±36.9^b	95.6±6.5^b
25	1068.8±55.5^a	193.1±8.3^a
50	1069.6±236.2^a	207.5±44.7^a
100	694.4±70.7^b	148.6±18.1^ab
200	465.1±29.0^b	96.8±7.5^b

Fig. 2 Root morphology of pitaya seedlings under different phosphorus levels

Fig. 3 Proportion of different root diameters of pitaya seedlings under different phosphorus levels Different lowercase letters indicate that the proportion of root system diameter varies significantly between different phosphorus levels (P<0.05).

Fig. 4 Soil alkalinity nitrogen content under different phosphorus supply levels Different lowercase letters indicate that the content of soil alkalinity nitrogen varies significantly between different phosphorus levels (P<0.05).

Tab. 4 Correlation coefficients of root length, root surface area, biomass, soil available nitrogen and plant nitrogen uptake

	X₁	X₂	X₃	X₄	X₅
X₁	1
X₂	0.987^**	1
X₃	0.816^**	0.797^**	1
X₄	-0.514^**	-0.501^*	-0.651^**	1
X₅	0.551^*	0.523^*	0.791^**	-0.342	1

Fig. 5 Effects of different phosphorus applications on nitrogen absorption of pitaya seeding

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