Song Ma,Yanzheng Ji,Yongjie Dong,Siqi Chen,Yingjie Wang,Shaoyu Lü
Stimulus-responsive pesticide or fertilizer systems have been emerged to improve the use efficiency of agrochemicals , reduce over-application and ensuing environmental problems. However, environmental-friendly synthesis of these systems still remain challenging. In this work, an environmental-friendly synthesis strategy has been developed to form a pesticide and fertilizer combination to achieve the integration of plant protection and nutrient supply. This pesticide-fertilizer combination system was fabricated using ammonium zinc phosphate (ZNP) and in-situ synthesized zeolitic imidazolate framework-8 (ZIF-8) as nutrients resources, and dinotefuran (DNF) as a pesticide. DNF was encapsulated in-situ (loading capacity of 12.32 ± 0.46%) during the ZIF-8 crystal synthesis process, rather than loaded by further adsorption, which improved its stability and prevented premature or rapid release. The hydrophobic ZIF-8 provided a pH-responsive slow-release behavior. The cumulative released DNF within seven days at pH 4.0, 7.0 and 10.0 was 66.30%, 40.41%, and 37.44%, respectively. The pesticide-fertilizer combination system showed significant effects on corn seed pre-cultivation, soil cultivation and pest control. This work provides a strategy for the integration of pesticide and fertilizer, which will reduce negative environmental effects caused by their over-applications and have great potential in modern sustainable agriculture.
Li Hui,Li Yangyang,Yan Haotan,Liao Xunhua,Wang Ning,Xue Zijian,Wang Shiyu,Li Wen,Chen Zhenbin,Liu Hong
This work prepared a lignin-based double-layer slow-release fertilizer (SRF). We prepared sodium alginate-zinc ammonium phosphate microbeads as the inner core of fertilizer by ion exchange method, cellulose acetate butyrate (CAB) co-blended with degradable material polylactic acid (PLA) as the inner coating, and two chemically modified lignin (sulfonated lignin and epoxy-aminated lignin) as the second coating. The synthesized Materials were characterized morphologically and structurally by FTIR, TG, XRD and SEM. The viscosity, mechanical property, water contact angle, water-holding property, water-retention and slow-release property of the samples were evaluated. PC-SRF, PSC-SRF and PEC-SRF all had superior water-retention and nutrient release property compared to sodium alginate-zinc ammonium phosphate. The release of urea and phosphorus in the single-layer PC-SRF reached equilibrium after 34 and 36 days, and their cumulative release rates reached 87.09% and 86.19%, respectively. The release of urea and phosphorus from the bilayer PSC-SRF reached equilibrium after 38 and 40 days, and the cumulative release rates reached 83.57% and 82.07%, respectively; the release of urea and phosphorus from the bilayer PEC-SRF prepared under the same conditions reached equilibrium after 38 and 42 days, and the cumulative release rates reached 81.47% and 81.66%, respectively. Graphical abstract
危险品化学品经营许可证（带存储）