Effects of modified clinoptilolite on phosphorus mobilisation and potassium or ammonium release in Ferrosols
Q. X. Hua A B , J. M. Zhou A D , H. Y. Wang A , C. W. Du A , X. Q. Chen A and J. Y. Li CA State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, 71 East Beijing Road, Nanjing 210008, P.R. China.
B Graduate School of Chinese Academy of Science, 19 Yuquan Road, Beijing 100049, P. R. China.
C Department of Industrial Engineering, Zhengzhou Institute of Aeronautical Industry Management, 2 Daxue Road, Zhengzhou 450015, P.R. China.
D Corresponding author. Email: jmzhou@issas.ac.cn
Australian Journal of Soil Research 44(3) 285-290 https://doi.org/10.1071/SR05118
Submitted: 22 August 2005 Accepted: 20 February 2006 Published: 5 May 2006
Abstract
An investigation was conducted to study effects of the potassium and ammonium saturated clinoptilolite on P availability in Ferrosols. The adsorption and desorption of phosphorus were determined by shaking 2.5 g soil with 0, 0.5, and 2.5 g clinoptilolite at 0.31 or 1.25 mg P/g soil in 50 mL solution for a total of 72 h (24 h for clinoptilolite and 48 h for phosphate). The nutrient concentrations in supernatants were measured by spectrophotometry. Results showed phosphorus solubility was significantly increased with clinoptilolite addition. Increasing the amount of clinoptilolite enhanced the concentration of P up to 6.85 and 41.29 mg/L at 0.31 and 1.25 mg P/g soil, respectively. Correspondingly, the amount of potassium and ammonium released from the clinoptilolite were up to 63.69 and 12.20 mg/L at 0.31 mg P/g soil, and 107.42 and 29.94 mg/L at 1.25 mg P/g soil. Nutrient concentrations in the treatments in which clinoptilolite was added before P were greater than that in the treatments in which P was added prior to clinoptilolite. The results also suggest that potassium and ammonium saturated clinoptilolite can increase P solubility while providing K and NH4 to the soil, a concurrent positive effect for plant growth.
Additional keywords: clinoptilolite, Ferrosols, phosphate, potassium, ammonium.
Acknowledgments
This research was funded by the National Natural Foundation of China (No. 30400273) and Potassium & Phosphate Institute/Potassium & Phosphate Institute of Canada (PPI/PPIC). The authors thank Professor Keith WT Goulding for revising this paper.
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