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Chinese Agricultural Science Bulletin ›› 2016, Vol. 32 ›› Issue (18): 136-141.doi: 10.11924/j.issn.1000-6850.casb16030006

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Adsorption and Slow-release Effect of Diatomite and Modified Sepiolite on NPK

Cao Chang, Liang Qiwen, Tian Yu, Tan Peng, Lin Wanhuang   

  1. (Hunan Provincial Key Laboratory of Phytohormones and Growth Development, Hunan Agricultural University, Changsha 410128)
  • Received:2016-03-01 Revised:2016-06-08 Accepted:2016-03-23 Online:2016-06-28 Published:2016-06-28

Abstract: In order to improve the using efficiency of NPK fertilizer, an oscillation experiment was conducted to study the adsorption effect of diatomite and modified sepiolite on NH4Cl, Ca(H2PO4)2 and KCl. And a pot experiment was also conducted to study NPK content in soil in different growth stages of maize and the slow-release effect of diatomite and modified sepiolite. The results showed that when the oscillation continued for 4 hours at 25℃ under the initial concentration of NH4Cl and KCl of 60 mg/L, the adsorption rates of diatomite to N and K reached the maximum of 12.80% and 17.26%, the adsorption rates of modified sepiolite to N and K reached the maximum of 19.22% and 14.75%. When the oscillation continued for 6 hours under the initial concentration of Ca(H2PO4)2 of 60 mg/L, the adsorption rates of diatomite and modified sepiolite to P reached the maximum of 35.42% and 13.42%. The results of the pot experiment showed that diatomite and modified sepiolite had good slow-release effect on NPK. This study obtained the optimum proportion of diatomite: modified sepiolite: urea: calcium superphosphate: potassium chloride as 3:3:17.3:9.3:9.6, which could lay a foundation for the development of slow-release fertilizer.

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