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Current status of soil pH and the change tendency in mango orchards in Panzhihua City, China*(PDF)

Chinese Journal of Applied & Environmental Biology[ISSN:1006-687X/CN:51-1482/Q]

2020 01
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Current status of soil pH and the change tendency in mango orchards in Panzhihua City, China*
ZHANG Hanyue1 2 HU Bin1 BAO weikai1** LI Guili3 PAN Hongbing3 & DU Bang 3
1 CAS Key Laboratory of Mountain Ecological Restoration and Bioresource Utilization & Ecological Restoration and Biodiversity Conservation Key Laboratory of Sichuan Province, Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu 610041, China
2 University of Chinese Academy of Sciences, Beijing 100049, China
3 PanZhiHua Academy of Agricultural and Forestry Sciences, Panzhihua 617061, China
mango cultiva ted region soil pH suitability acidification alkalization fertilization lime soil conditioner

Soil pH , which seriously affecting the growth and development of plants, was influenced by irrational agricultural activities. This research aimed to reveal the current status of soil pH and the pH suitability in mango cultivated region in Panzhihua city. The soil pH change tendency and the effect of fertilization management on it were also investigate d in this research. We analyz ed soil pH values in the beneath canopy area (BCA) and the inter space area (ISA) from 162 mango orchards in different altitude gradient s (Valley area: 950-1200 m; Lower mountain area: 1200-1500 m; Middle mountain area: 1500-1800 m) and different cultivated stages (Before fruiting stage: 2-5 a; Early fruiting stage: 6-10 a; Prosperous fruiting stage : 11-26 a) in panzhihua city . The results indicated that soil pH values varied from 4.0-8.4 in mango cultivated region in Panzhihua. About 63.5% orchards soil pH ranged from 5.5 to 7.5 was optimum for mango growth. The soil pH in middle mountain area was significantly lower than that in valley and lower mountain areas. For the 0-20 cm soil depth, soil pH in 56.94% of the sites decreased, and 43.06% of the sites increased in pH. For the 20-40 cm soil depth , soil pH in 70.42% decreased, and 29.58% increased. The percentage of soil acidification (the decrease of soil pH) orchards among cultivated stages was in order of Early fruiting stage > Before fruiting stage > Prosperous fruiting stage. Among the soil alkalization (the increase of soil pH ) orchards, the value of soil pH increased in the Prosperous fruiting stage was higher than that in the other two stages. We also found that the value of soil pH decreased was higher in the orchards that only using N (Nitrogen), P (Phosphorus), and K (potassium) fertilizers than the orchards using NPK fertilizers combine with lime and soil conditioner . In the short term, using lime and soil conditioner in surface could alleviate the acidification tendency in topsoil, but has no obvious effect on deep soil. We need to take care of the soil pH suitability in the rest 36.5% mango orchards. What’s more, existing mango fertilization management has led to different soil pH change tendency. Soil acidification related to long term using of chemical NPK fertilizers, and soil alkalization related to the lime and soil conditioner using. The research results could provide theoretical guidance for improving the level of mango fertilization management and the soil quality in Panzhihua mango cultivated region.




Last Update: 2019-06-19