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酸性水稻土施用磷矿粉的农学有效性和经济效应的评价 总被引:3,自引:0,他引:3
4个酸性水稻土施用不同磷源的试验结果显示 :(1)水稻土施用磷肥的增产效应 ,油菜比水稻大得多 :发育第四纪红色黏土红壤稻田 (有效磷含量 6 .3mg/ kg)施用磷肥增加油菜籽 13.7~ 2 2 .2倍 ,而发育于河流冲积物和红砂岩的水稻土 (有效磷含量 10 .8mg/ kg)施用磷肥增加油菜籽 2 .6 8~ 3.6 3倍 ;发育第四纪红色黏土和花岗岩的红壤稻田施用磷肥增加稻谷产量分别为 1.4 %~ 3.8%和 3.5 %~ 7.3% ;(2 )红壤水稻土施用 Gafsa磷矿粉农学相对有效性 (86 .2 %~ 10 4 .7% )与过磷酸钙相近 ,而大大高于昆阳磷矿粉 (47.2 %~ 6 4 .5 % ) ;(3)油菜施用磷肥增加的产值 (2 839~ 5 30 7元 / hm2 )显著高于水稻施用磷肥增加的产值 (2 2 4~ 74 2元 / hm2 ) ;(4)油菜和水稻施用磷肥的产投比昆阳磷矿粉 >Gafsa磷矿粉 >过磷酸钙 ;(5 )在施磷矿粉的基础上 ,施用硫肥可使油菜籽产量提高 8.4 %~ 19.5 % ,而稻谷产量仅提高 1.6 %。 相似文献
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1磷肥行业1)磷复肥产销量大幅下降,库存持续增加。10月份全国磷肥产量92万t P2O5,同比下降21%,环比下降16%;1~10月磷肥累计产量1 050万t P2O。高浓度磷复肥五大品种除硝酸磷肥外10月产量均在下降,其中,磷酸一铵下降近60%,NPK三元肥下降近40%。高浓度磷复肥10月产量55万tP2O5,同比下降36%;累计总量752万tP2O5,同比下降10%。1~10月DAP累计实物产量674万t,开工率不足50%;产 相似文献
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回顾2000~2006年云南硫酸、磷肥产量增长情况,提出云南硫酸磷肥工业的发展蓝图。2010年硫酸产能达1250万t/a,并要加快大中型硫磺制酸装置低温位热能回收利用。云南磷肥工业将以大中型高浓度磷复肥企业为主,以整合重组后的低浓度磷肥企业为辅。云南磷肥工业的发展将会主要依托云南云天化国际化工股份有限公司(简称“国际化工)”,到2010年,云南85%~90%高浓度磷复肥、50%的过磷酸钙将集中在“国际化工,”产能分别达290万t/a和36万t/a(折纯P2O5)。磷矿产量(折标)2010年预测达2 000万t/a,其中擦洗与浮选磷矿将占70%。 相似文献
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苯乙烯是重要的石油化工原料。本文介绍了国内外苯乙烯生产的发展概况,合成乙苯,苯乙烯所用的催化剂种类,并就苯乙烯生产及催化剂的发展趋势提出了自己的观点。 相似文献
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责任是人应主动承担的角色义务和对其因过失所造成后果应承担的责罚.有两层涵义:一是义务;二是后果.责任心是个体自觉做好分内事务和履行道德义务的心理倾向,是个性心理品质成分中自我特征维度上的重要内容.责任心具有两个方面的涵义:一是角色分内职责;二是角色道德义务.责任心是一种通过责任认知、责任个性和责任适应的动态形式表现出来的静态品质,责任心是责任心过程结构与责任心关系结构相互制约、相互影响的统一体. 相似文献
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《国际聚合物材料杂志》2012,61(1-4):113-122
Abstract Kinetics and mechanisms of oxidation of 6 acetals by molecular oxygen and ozone in liquid phase have been studied. Reaction with molecular oxygen (70°C, 15–16 hr) leads to the formation monoethers of the corresponding glycols with 68–90% selectivity. Salts of metals and complexes with crown-ethers have increased the reaction rate significally. Ozone have reacted with acetals with formation similar products. The mechanisms of intermediate stages have been proposed. 相似文献
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The variation of the Au 4f binding energy of Au clusters with the cluster size has been established by measuring the binding energies of clusters whose size distributions were independently determined by HREM and STM. The binding energy increases significantly when the cluster size is less than 2 nm. Au-Cu bimetallic clusters of the composition Cu3Au have been deposited for the first time on carbon substrates. The shifts in the core level binding energies of the bimetallic clusters show the effect of alloying in the case of large clusters, but show effects of both alloying and cluster size in the case of the small clusters. The interaction of CO with Cu3Au clusters is stronger than with a bulk Cu metal. The interaction of CO with small Cu clusters also seems to be stronger than with bulk Cu or with large Cu clusters. 相似文献
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对用甘油锌作光稳定剂的光稳定作用进行了测试,并与光稳定剂NBC,BZ进行了比较。研究了甘油锌,NBC和BZ与双酚A的复配效果。研究结果表明,甘油锌是一种性能优良的光稳定剂。 相似文献
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塑料挤出机螺杆,机筒耐磨损,耐腐蚀的强化与应用 总被引:4,自引:0,他引:4
对塑料挤出机,注塑机螺杆,机筒的磨损,腐蚀原因及提高螺杆,机筒耐磨损,耐腐蚀的方法、制造与应用作了较详尽的介绍。 相似文献
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Emmanuel Ginsburger Fernand Pla Christian Fonteix Silvère Massebeuf Philippe Swaels 《Chemical engineering science》2003,58(19):4493-4514
This work deals with modelling of emulsion polymerization processes using batch and semi-batch reactors. Specific attention is paid to copolymerization of the system styrene/butyl acrylate.The main key parameters of the model are identified on the basis of batch experimental data in order to describe the complete sketch of emulsion polymerization. The model is then used to simulate, under several operating conditions, the polymerization rate, the global monomers conversion, the number and weight average molecular weights as well as the particle size distribution and the glass transition temperature. Then, the model is generalized to the use of semi-batch processes and validated for this application. 相似文献