[1]QU Lie,YUE Li,YANG Jiu-jun,et al.Study on the N, P, and K Initial Release Rates and Orthogonal Optimization of Cement-fly Ash-based Plant-growing Fixing-sand Materials[J].Research of Soil and Water Conservation,2010,17(03):148-152.
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Study on the N, P, and K Initial Release Rates and Orthogonal Optimization of Cement-fly Ash-based Plant-growing Fixing-sand Materials
Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
17
Number of periods:
2010 03
Page number:
148-152
Column:
Public date:
2010-06-20
- Title:
- Study on the N, P, and K Initial Release Rates and Orthogonal Optimization of Cement-fly Ash-based Plant-growing Fixing-sand Materials
- Keywords:
- plant-growing sand-fixing material; controlled-release fertilizer; absorbent agent; orthogonal experiment; N initial release
- CLC:
- S157.2;S688.4
- DOI:
- -
- Abstract:
- Using 3~4 months release period Osmocote 14-14-14 made in the United States as controlled-release fertilizer source, PAM, SAP1 and SAP2 as water-absorbents, and cement-fly ash-based sand-fixing materials made by our laboratory formula as sand-fixing materials, types of absorbent, absorbent dosage, fertilizer usage and water-cement ratio of cement-fly ash-based plant-growing fixing-sand materials were orthogonally optimized by the sand column leaching method. The relationship among the material parameters, the release rate of N, P, K, and compressive strength and flexural strength of materials was investigated. The results showed that the main factors affecting the N release rate are fertilizer usage and the type of water absorbent, and the main factors affect flexture strength are water-cement ratio and water absorbent usage. The optimizing formula is 1.5% PAM, 0.8 g Osmocote/100 g sand and water-cement ratio of 1.2. In cement-fly ash-based sand-fixing materials, the order of 28 days initial release of N, P, and K is K>N>P since potassium-rich and fixing-phosphorus of cement-based materials made K reduced and P increased; and the porous feature of cement-based materials makes the N released by gaseous ammonia and liquid ammonia. The crack extension rate and water-soluble swelling of controlled-release fertilizer outside film will affect the initial release rate of N.
- References:
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Last Update:
1900-01-01