›› 2019, Vol. 31 ›› Issue (10): 1681-1688.DOI: 10.3969/j.issn.1004-1524.2019.10.14

• Environmental Science • Previous Articles     Next Articles

Conversion dynamics and effectiveness of ammonium polyphosphate with different polymerization degrees to soil phosphorus

CHEN Xiaojuan1, CHEN Yulin1, LIN Jingjing1, YANG Yibin1, HU Kewei2, ZHANG Chenglin1,*   

  1. 1. College of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642, China;
    2. Dongguan Yixiang Liquid Fertilizer Co., Ltd., Dongguan 523135, China
  • Received:2019-06-10 Online:2019-10-25 Published:2019-10-30

Abstract: In the present study, calcareous soil and laterite soil were selected as test materials, and soil culture experiment was carried out to explore the effect of ammonium polyphosphate (APP) with different polymerization degrees on the dynamic transformation and availability of soil phosphorus. Five treatments were set up: CK, no phosphate fertilizer; MAP, application of monoammonium phosphate; APPL, application of low polymerization degree APP; APPM, application of medium polymerization degree APP; APPH, application of high polymerization degree APP. It was shown that, in calcareous soils, the available phosphorus content under APPH was significantly (P<0.05) lower than that under MAP at 5 d, yet it was significantly (P<0.05) higher than that under MAP by 23.92% at 50 d. In laterite soil, the available phosphorus content under APPH was significantly (P<0.05) lower than that under MAP in 5-10 d, yet it was significantly (P<0.05) higher than that under MAP in 15-50 d. The available phosphorus content under APPL was significantly (P<0.05) higher than that of MAP in 5-15 d, yet there was no significant difference between the two treatments in 30-50 d in laterite soil. In calcareous soils, the content of Resin-P under APPL and APPH was higher than that under MAP during the whole experiment, while the content of NaCHO3-P under APPH increased with the prolongation of culture time, which was higher than that under other treatments. In laterite soil, the contents of Resin-P and NaHCO3-P under APPL and APPH were lower than those under MAP initially, yet they got higher than those under MAP with the increasing culture time. In calcareous soil, APPL and APPH could increase the availability of soil phosphorus as compared with MAP, and reduce phosphorus fixation. In laterite soil, APPL exhibited high availability of phosphorus in the early stage, which was suitable for basal application, yet APPH showed high availability of phosphorus in the later stage, and reduced phosphorus fixation in acidic soils.

Key words: ammonium polyphosphate, polymerization degree, available phosphorus, calcareous soil, laterite soil, active phosphorus

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