Multifunctional slow-release organic-inorganic compound fertilizer.
Multifunctional slow-release organic-inorganic compound fertilizer (MSOF) has been investigated to improve fertilizer use efficiency and reduce environmental pollution derived from fertilizer overdosage. The special fertilizer is based on natural attapulgite (APT) clay used as a matrix, sodium alginate used as an inner coating and sodium alginate-g-poly(acrylic acid-co-acrylamide)/humic acid (SA-g-P(AA-co-AM)/HA) superabsorbent polymer used as an outer coating. The coated multielement compound fertilizer granules were produced in a pan granulator, and the diameter of the prills was in the range of 2.5-3.5 mm. The structural and chemical characteristics of the product, as well as its efficiency in slowing the nutrients release, were examined. In addition, a mathematical model for nutrient release from the fertilizer was applied to calculate the diffusion coefficient D of nutrients in MSOF. The degradation of the SA-g-P(AA-co-AM)/HA coating was assessed by examining the weight loss with incubation time in soil. It is demonstrated that the product prepared by a simple route with good slow-release property may be expected to have wide potential applications in modern agriculture and horticulture.
State Key Laboratory of Applied Organic Chemistry, Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province, and Department of Chemistry, Lanzhou University, Lanzhou 730000, People's Republic of China.
Boli
B
Ni
Mingzhu
M
Liu
Shaoyu
S
Lü
Lihua
L
Xie
Yanfang
Y
Wang
D002626:Chemistry, Pharmaceutical; D003692:Delayed-Action Preparations / Q000737:chemistry*; D005308:Fertilizers / Q000032:analysis*; D007287:Inorganic Chemicals / Q000737:chemistry*; D007700:Kinetics; D009930:Organic Chemicals / Q000737:chemistry*
D003692:Delayed-Action Preparations; D005308:Fertilizers; D007287:Inorganic Chemicals; D009930:Organic Chemicals