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包膜缓控释肥料用包膜材料的探讨 总被引:2,自引:0,他引:2
简要介绍关于目前国内外缓控释肥料的生产及包膜缓控释肥料生产用包膜材料的种类和特点;阐述开发利用缓效、长效肥料,特别是水溶性低的肥料为速溶、速效性肥料的缓控释包膜材料,采用“以肥包肥”缓控释技术的必要性及取得的成果. 相似文献
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缓/控释肥料(Slavand Controlled Release Fertilizer,SCRF)的生产和使用技术已有30多年历史,其作用是使肥料施入土壤后的释放行为与作物整个生长期的需肥规律一致,在作物生长初期供肥不过剩,在作物生长中、后期供肥不短缺,且不需进行追肥。缓/控释肥料的工艺多种多样,如利用天然存在的有机物、微溶合成化合物以及物理包膜等。物理包膜技术发展较快,包膜物料也呈多样化,如石腊、合成聚合物等,其中以肥包膜广为业界关注,如以钙镁磷肥包膜、硫磺包膜等。 相似文献
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聚合物在缓/控释肥料中的应用研究 总被引:6,自引:0,他引:6
用一种聚合物为主要包膜原料给肥料包膜,并将包膜肥料与未包膜肥料进行对比试验。结果表明,包膜肥料达到了作物所要求的缓/控释效果,说明这种聚合物在包膜肥料中的应用是可行的。 相似文献
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缓/控释肥料的新进展及特性评价 总被引:16,自引:0,他引:16
缓/控释肥料具有提高肥料利用率、降低环境污染、提高作物产量等特点,因而成为目前肥料研究与开发的热点。本文综述了各种类型缓/控释肥料的最新研究进展,介绍了几种检测缓/控释肥养分释放特性的方法。此外,文章分析了缓/控释肥料推广应用中存在的问题,并对其未来发展进行了展望。 相似文献
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Hydrolyzed olive pit residues from the production of furfural were ammoniated to obtain a nitrogenenriched humic fertilizer. Samples had been previously oxidized with nitric acid. The oxidized samples were further ammoniated in a batch reactor in the following range of experimental conditions: T = 80–210°C,
, solid/liquid ratio, S/L = 0.5–2.8 w/w and reaction time, t = 1–4 h.Planning of experiments was made by statistical design and results were fitted by multiple non-lineal regression polynomials. The product consists of two fractions: a water soluble fraction which contains most of the nitrogen (10–13 wt%) and a solid fraction with a very low nitrogen content (<4.0 wt%), which is likely to be fixed during the oxidation step. The soluble fraction can be used as a humic fertilizer and the solid product as a soil conditioner. 相似文献
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努力发展结合国情的缓(控)释肥料 总被引:1,自引:0,他引:1
在21世纪我国化肥工业高速发展及新时期下对化肥提出综合性要求的环境下,论述了加速发展结合国情的缓(控)释肥料的重要性。介绍了尿醛肥、稀土缓释肥、涂硫缓释肥和缓释掺混肥等缓(控)释肥的技术及其可行性。 相似文献
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Slow release rate: Individual granules and population behaviour 总被引:1,自引:0,他引:1
Individual granules within a given granule population of a slow-release fertilizer (SRF) have a different release pattern. The populations studied differed both in relation to the time delay before the start of the release process and to the duration of the release. An association between a short delay period and a rapid release was found.The random reease distribution can be approximated using first-order rate equations. In cases, a term describing a lag period should be added.The distribution of release timing among the fertilizer granules may allow a long-lasting nutrient supply to the plant, as long as there are enough granules within the root zone to allow a uniform supply pattern. 相似文献
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对我国缓/控释肥料发展的思考和建议 总被引:2,自引:0,他引:2
缓/控释肥料具有提高化肥利用率、减少使用量与施肥次数、降低生产成本、减少环境污染、提高农作物产品品质等优点,代表着新型肥料产业的发展方向。概述了我国缓/控释肥料的现状、发展趋势以及发展过程中存在的问题,同时解读了相关国家政策。 相似文献
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介绍了塔式熔体造粒复合肥的生产工艺装置及其由单塔改为双塔的技术创新点,同时对其产品肥效作了农化试验。结果证明,整个生产过程不仅节约能源、减轻环境污染,而且产品具有缓释长效的功能。 相似文献
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