芹菜对铁的吸收及铁对其生长和品质的影响   总被引：2，自引：0，他引：2  

周浩  彭克勤  沈志锦  武新红  库文珍  黄欣 《中国农学通报》2006,22(7):385-388

通过调节水培营养液中铁浓度分别为0,0.7,1.4,2.8,5.6,8.4,11.2和14.0.mg/L的8个水平种植4个芹菜品种,研究了不同铁供应水平对芹菜生长和植株铁含量及其品质的影响。结果表明,0.7mg/L浓度下,芹菜生长良好,没有表现缺铁症状,1.4mg/L浓度时,叶片中的铁含量达最大值,2.8mg/L浓度下,芹菜产量,Vc、蛋白质、叶绿素含量较高,硝酸盐含量较低。在各铁供应水平下4个芹菜品种均未出现铁中毒现象。供铁以后,其供应量对芹菜叶中钙、镁含量影响不大;锌含量与营养液中铁浓度呈负相关,铁锌之间表现出离子竞争作用。  相似文献   

鲜食糯玉米农艺性状与鲜穗产量的灰色关联度分析     

王付娟  库丽霞  孟庆雷  赵文明 《中国农学通报》2007,23(7):253-253

以正在参加黄淮海国家糯玉米区域试验的19个新品种为材料，利用灰色关联度分析方法，对11个农艺性状与鲜穗产量进行了关联度分析。结果表明，糯玉米农艺性状与产量关联度的大小依次为穗粗﹥穗行数﹥穗长﹥株高﹥收获期﹥行粒数﹥轴粗﹥穗位高﹥鲜百粒重﹥鲜出籽率﹥秃尖长。穗粗、穗行数、穗长、株高是影响糯玉米鲜穗产量的主要因素，而鲜穗百粒重、鲜出籽率、秃尖长度对产量影响则较小。但影响鲜穗产量的主要因素在不同产量水平品种中存在一定差异  相似文献   

Decomposition of Gaseous Acetone in an Annular Photoreactor Coated with TiO2 Thin Film     

Young Ku  Kun-Yu Tseng  Wen-Yu Wang 《Water, air, and soil pollution》2005,168(1-4):313-323

Photocatalytic decomposition of gaseous acetone was studied with a fixed-bed annular reactor using TiO₂ as the photocatalyst. The relation of UV light intensity to the reaction rate was found to be roughly first-ordered. The decomposition of acetone was obviously enhanced with increasing retention time. Removal of acetone was slightly increased with the relative humidity for experiments conducted with relative humidity below 20%. However, the removal of acetone was decreased drastically with relative humidity for experiments conducted with relative humidity greater than 20%. Decomposition of acetone was promoted considerably with increasing oxygen concentration for experiments conducted with oxygen less than 200,000 ppmv, yet the decomposition of acetone was kept relatively constant for experiments conducted with oxygen above 200,000 ppmv. Based on the mass balance for carbon species, the amount of organic intermediates formed for experiments conducted under various conditions were found to be minimal. Experimental results for the decomposition of gaseous acetone by UV/TiO₂ process can be adequately described by the developed two-site Langmuir–Hinshelwood (L–H) kinetic model.  相似文献   

Switzerland. Compromise allows transgenic trials     

Ku M 《Science (New York, N.Y.)》2002,298(5592):343

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Ribosomes from pear fruit     

Ku LL  Romani RJ 《Science (New York, N.Y.)》1966,154(3747):408-410

Ribosomes, subunits and polysomes, have been isolated from cells of ripening (senescent) fruit. Sedimentation in sucrose gradients, sedimentation constants, and electron micrographs confirm the physical resemblance of fruit ribosomes to those from other living tissues.  相似文献   

Austrian universities. Scientists spar over reform plan     

Ku M 《Science (New York, N.Y.)》2001,292(5522):1625-1626

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转Bt基因棉对棉田寄生物非亲和效应的研究     

余月书  杨益众  任璐  邵益栋  钱坤 《扬州大学学报(农业与生命科学版)》2004,25(2):65-67

采用分期接虫和分期回收的方法，研究常规棉与转基因棉品种棉铃虫寄生性天敌在不同棉花品种间的寄生作用。结果表明：棉铃虫第2～4代发生期以及卵期和幼虫期，转基因棉品种的棉铃虫卵、幼虫寄生率均显著低于常规棉品种。棉铃虫卵期的寄生蜂主要为拟澳洲赤眼蜂(Tricogramma confisum)，幼虫寄生蜂为棉铃虫齿唇姬蜂(Compoletis chlorideae)等。由此可见转基因棉对棉铃虫寄生性天敌存在非亲和效应。通过对转Bt基因棉国抗22及其亲本泗棉3号棉铃虫不同世代间卵、幼虫寄生率的纵向比较，发现同一品种棉花上不同世代间棉铃虫卵寄生率差异不显著，而幼虫寄生率差异显著。  相似文献   

快速充电技术的探讨   总被引：1，自引：0，他引：1  

王库  冯义 《中国农业大学学报》2001,6(2):62-67

介绍了快速充电技术的基本原理，对快速充电方法和充电电源进行了重点分析，提出变压间歇充电法，同时提出采用模糊控制来实现具体的充电控制。  相似文献   

我国东北地区土壤有机碳密度和储量的估算研究   总被引：32，自引：1，他引：32       下载免费PDF全文

孙维侠  史学正  于东升  王库  王洪杰 《土壤学报》2004,41(2):298-300

土壤有机碳库(Soilorganiccarbonpool)是陆地碳库的主要组成部分,在陆地碳循环研究中有着重要的作用。据估计,全球大约有15 0 0Gt碳是以有机质形态存在于土壤中[1] ,因此,土壤有机碳库量的微小变化,都会对大气温室气体浓度及全球气候产生相当大的影响。另一方面,土壤有机碳含量  相似文献   

宁夏南部黄土丘陵区退化天然草地改良效果综合评价     

刘库谢应忠  马红彬 《水土保持研究》2007,14(4):131-133

采用多层次模糊综合评判法,综合分析了宁夏南部黄土丘陵区不同改良措施下的改良效果,结果表明：“88542”整地＋播种综合评判值最高,达到5.9188,改良效果最好,施肥和封育的综合评判值其次,带状翻耕＋播种的综合评判值最低,仅为2.7750,远低于对照。  相似文献