| Activation of organic acids on phosphorus of soil with different fertility |
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| DOI：10.7606/j.issn.1000-7601.2012.04.11 |
| Key Words: organic acids with low molecular weight soil fertility activation of phosphorus |
| Author Name | Affiliation | | YANG Shaoqiong | Institute of Soil and Water Conservation, CAS & MWR, Yangling, Shaanxi 712100 | | DANG Tinghui | Institute of Soil and Water Conservation, CAS & MWR, Yangling, Shaanxi 712100
College of Resources and Environment, Northwest A&F University, Yangling, Shaanxi 712100, China | | QI Ruisheng | College of Resources and Environment, Northwest A&F University, Yangling, Shaanxi 712100, China | | MA Ruiping | College of Resources and Environment, Northwest A&F University, Yangling, Shaanxi 712100, China |
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| Abstract: |
| To solve the problem of soil phosphorus accumulation and fixation in calcareous soil, extraction experiments were conducted to investigate the effect of organic acids with low molecular weight (LMW) on phosphor
us activity in different fertile calcareous soils. The results showed that the organic acids could significantly stimulate the mobilization of soil phosphorus in all three soils tested. When in the same concentration, the three organic acids followed an order of oxalic acid＞citric acid＞malic acid in the capability of activating soil phosphorus in the low fertility and moderate fertility soil; In the high fertility soil, the three followed the order of citric acid＞oxalic acid＞malic acid. Low concentration of organic acids (≤2 mmol/L) could significantly restrained soil phosphorus activity in low and moderate fertility soil, especially for the malic acid. LMW organic acids could decline the pH of soil ext
ract significantly, and the citric acid showed the strongest declining capacity. Meanwhile, for the same kind of organic acid, the extent of phosphorus activating decreased with the increasing of soil pH. |
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