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	Release characteristics of nutrients from polymer-coated compound controlled release fertilizers
	Du, Chang-wen; Zhou, Jian-ming; Shaviv, Avi
刊名	JOURNAL OF POLYMERS AND THE ENVIRONMENT
	2006-07-01
卷号	14期号:3页码:223-230
关键词	polymer controlled release nutrients medium model
ISSN号	1566-2543
DOI	10.1007/s10924-006-0025-4
通讯作者	Du, Chang-wen(chwdu@issas.ac.cn)
英文摘要	Reliable information regarding release characteristics of nutrients from a polymer-coated controlled release fertilizer (CRF) is essential for beneficial agronomic and environmental results. Significant knowledge regarding nitrogen release from polymer-coated urea was gained while the information regarding the release of the different nutrients contained in polymer-coated compound N-P-K CRF remains limited. An experiment in which major factors affecting the differential release of nutrients from two coated compound CRF was performed in free water, water saturated sand and sand at field capacity. In general, nitrate release was the fastest, followed by ammonium and potassium whereas phosphate was significantly slower, with a rate of linear release in free water 45-70% slower than that of nitrate. Little differences were obtained for the lag periods of nitrate, ammonium and potassium release (2-10 days) under the experimental conditions, whereas for P they were one order of magnitude larger. The main factor slowing the release was assumed to be the lower solubility of ions with P being the least soluble. Release into free water was, expectedly, somewhat faster than that into saturated sand and significantly faster as compared to sand at field capacity and particularly so for P. Raising the temperature from 20 degrees C to 40 degrees C increased the rate of linear release of the different nutrients. The energy of activation, EA(rel), estimated for the linear release, of the different nutrients, was narrow ranging between 37 to 46 (KJ mol(-1)) whereas the mean values obtained for the two CRF, differing by 50% in coating thickness, was non-significant. However, EA(rel) was significantly different in different media. The complex effect of temperature on the lag period and nutrient interactions during release deserve further investigation.
收录类别	SCI
WOS关键词	POTASSIUM RELEASE ; DIFFUSION RELEASE ; CROP RESPONSE ; UREA ; GRANULES ; SIMULATION ; NITROGEN ; MODEL
WOS研究方向	Engineering ; Polymer Science
WOS类目	Engineering, Environmental ; Polymer Science
语种	英语
出版者	SPRINGER/PLENUM PUBLISHERS
WOS记录号	WOS:000242286100002
内容类型	期刊论文
URI标识	http://www.corc.org.cn/handle/1471x/2558582
专题	南京土壤研究所
通讯作者	Du, Chang-wen
作者单位	1.Chinese Acad Sci, State Key Lab Soil & Sustainable Agr, Inst Soil Sci, Nanjing 210008, Peoples R China 2.Technion Israel Inst Technol, Fac Civil & Environm Engn, IL-32000 Haifa, Israel
推荐引用方式 GB/T 7714	Du, Chang-wen,Zhou, Jian-ming,Shaviv, Avi. Release characteristics of nutrients from polymer-coated compound controlled release fertilizers[J]. JOURNAL OF POLYMERS AND THE ENVIRONMENT,2006,14(3):223-230.
APA	Du, Chang-wen,Zhou, Jian-ming,&Shaviv, Avi.(2006).Release characteristics of nutrients from polymer-coated compound controlled release fertilizers.JOURNAL OF POLYMERS AND THE ENVIRONMENT,14(3),223-230.
MLA	Du, Chang-wen,et al."Release characteristics of nutrients from polymer-coated compound controlled release fertilizers".JOURNAL OF POLYMERS AND THE ENVIRONMENT 14.3(2006):223-230.

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