Acta Agriculturae Zhejiangensis ›› 2021, Vol. 33 ›› Issue (4): 697-703.DOI: 10.3969/j.issn.1004-1524.2021.04.15

• Environmental Science • Previous Articles     Next Articles

Effect of ammonium polyphosphate on phosphorus adsorption and desorption in laterite and calcareous soil

YANG Yibin1(), CHEN Xiaojuan1, DENG Lansheng1, LIN Jingjing1, CHENG Fengxian1, HU Kewei2, ZHANG Chenglin1,*(), TU Panfeng3,*()   

  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
    3. College of Horticulture and Landscape Architecture, Zhongkai University of Agriculture and Engineering, Guangzhou 510225, China
  • Received:2020-10-12 Online:2021-04-25 Published:2021-04-25
  • Contact: ZHANG Chenglin,TU Panfeng

Abstract:

In the present study, the soil culture experiments were conducted to study the adsorption and desorption behaviors of ammonium polyphosphate (APP) and monoammonium phosphate (MAP) in calcareous soil and laterite, to provide theoretical reference for the evaluation of phosphorus availability. Six treatments were introduced in this work according to the materials used: APP1 (mainly high polymer), APP2 (mainly oligomeric), APP3 (mainly low, medium, and high polymer), MAP, A-M (APP3 and MAP mixed with the ratio of 1∶1 based on the content of P2O5), and CK (blank control). All the treatments set the same rate of nitrogen and phosphorus except CK. After 50 days of soil cultivation, the adsorption and desorption characteristics of phosphorus were measured. The results showed that the equations of Langmuir, Freundlich, and Temkin could well fit the adsorption characteristics of soil phosphorus in different soils, and the Freundlich equation had the best fitting effect with a correlation coefficient of 0.86-0.98. In calcareous soil (except CK), the soil with APP1 had the strongest adsorption capacity, while the soil with A-M had the weakest adsorption capacity, the largest phosphorus desorption, and the highest phosphorus desorption rate. In laterite (except CK), the soil with APP1 showed the strongest adsorption capacity, and the soil with APP2 showed the weakest adsorption, the largest phosphorus desorption, and the highest phosphorus desorption rate. The results indicated that the application of MAP with APP with uniform polymerization degree distribution and high aggregate content could reduce the adsorption of phosphorus in calcareous soil to improve the availability of phosphorus. While APP with low polymerization degree could lower the adsorption of phosphorus by laterite, and maintain the balance of phosphorus.

Key words: ammonium polyphosphate, monoammonium phosphate, adsorption, desorption, polymerization degree

CLC Number: