青花菜贮藏期间颜色变化动力学模型的建立   总被引：2，自引：3，他引：2  

任珂  屠康  潘磊庆  陈育彦 《农业工程学报》2005,21(8):146-150

该试验利用CIE-L^*a^*b^*(Commission International de I'Eclairage,国际照明委员会制定的色彩空间坐标表色系统)中的a^*、b^*、H°、TCD(Total Color Difference,总色差)以及叶绿素含量和黄化级数来衡量青花菜色泽的变化情况, 旨在建立贮藏期间多种颜色指标的动力学模型。试验组分为0℃、5℃、10℃条件下分别在HDPE(high-density polyethylene高密度聚乙烯)薄膜单球包装与不包装两种情况下进行。试验结果显示，包装提升了青花菜贮藏期间的活化能，延迟了呼吸跃变的启动。非线性回归分析的结果表明，色泽参数b^*和TCD的速率常数符合Arrhenius模型，模型符合一级动力学反应；而a^*和H°的变化则可用多项式表示。贮藏青花菜的黄化级数与色泽参数b^*之间具有良好的相关性，为利用计算机视觉系统进行颜色分级提供了理论依据。  相似文献   

青花菜雄性不育系与保持系花蕾同工酶分析   总被引：4，自引：0，他引：4  

李又华  杨暹  罗志刚  关佩聪 《华南农业大学学报》2003,24(1):13-15

采用聚丙烯酰胺凝胶垂直板电泳法对青花菜雄性不育系及保持系花蕾的雄蕊,雌蕊,花萼和花瓣进行了过氧化物酶（POD）,过氧化物歧化酶（SOD）,多酚氧化酶（PPO）,多酚氧化酶（PPO）和儿茶酚氧化酶（CAO）同工酶分析。结果表明,4种同工酶谱不仅在不育系与保持系之间有明显差异。而且在不育系或保持系内 花蕾不同部位之间也有明显差异。表现为花蕾的POD,CAO同工酶在不育系的谱带数多。而保持系谱带数少,PPO,SOD同工酶则正好相反,4种同工酶在不育系与保持系之间的差异主要表现在雄蕊上。  相似文献   

西兰花采后贮藏研究初报     

赵桂芳  张晓宇  王华瑞 《山西农业科学》2013,41(10):1119-1121

对西兰花耐贮品种和包装材料进行筛选,并找到西兰花贮期品质的变化规律。结果表明,0℃条件下贮藏60 d,不同品种西兰花贮期的呼吸强度均呈先下降后上升的趋势,Vc含量呈先上升后下降的趋势;用保鲜袋包装的西兰花贮藏60 d,其失重率仅为0.25%,而不加包装的同一品种失重率达57.1%⁶2.5%,失去食用价值。综合外观、呼吸强度、Vc含量和失重率等因素确定,冠军是较耐贮的品种;PE(0.04 mm)保鲜袋和BIGC-K型智能保鲜袋是适宜的贮藏包装材料。  相似文献   

Effects of Linear Alkylbenzene Sulfonates (LASs) in Sewage Sludge–Amended Soils on Nutrient Contents of Broccoli Plants     

《Communications in Soil Science and Plant Analysis》2012,43(15-20):2605-2614

Abstract

Sewage sludge is used in agriculture as a fertilizer and an organic amendment to improve physical and chemical soil properties. However, sludge contains organic compounds, such as surfactants, which may be toxic in the soil–plant system. The effects on plants of linear alkylbenzene sulfonates (LAS), a group of anionic surfactants that are widely used in detergent products, have not been well defined. In this experiment, the effect of differently treated sewage sludge containing LAS on the macronutrient and sodium contents of different parts of broccoli plants (Brassica oleracea L. var. botrytis subvar. cymosa Lam.) was studied in a field experiment. Fertilizer treatments were un‐composted sewage sludge (UCSS), composted sewage sludge (CSS), and a control without fertilization (NF). The LAS levels were established across all fertilizer treatments by addition of 0, 15, or 30 g LAS m^?2 (LAS0, LAS15, and LAS30, respectively). In general, the macronutrient contents in shoots, leaves, and edible parts of broccoli were higher in plants cultivated without fertilization but with LAS. In most cases, the LAS application increased the nitrogen, phosphorus, and sodium contents of the different plant parts, whereas calcium and magnesium concentrations were reduced.  相似文献   

花椰菜总黄酮提取工艺优化          下载免费PDF全文

尹鹏  郭新  梁梓  胡霞 《南方农业学报》2016,47(4):640-644

[目的]优化花椰菜总黄酮提取工艺,为其药用开发与利用提供技术参考.[方法]以乙醇为浸提溶剂、花椰菜总黄酮含量为考察指标,选择乙醇体积分数、液料比、提取温度、提取时间4个因素进行单因素试验,每个因素各筛选4个水平进行正交试验,以优化花椰菜总黄酮提取工艺.[结果]影响花椰菜总黄酮提取效果的主次因素排序为:乙醇体积分数>提取时间>提取温度>液料比;花椰菜总黄酮最佳提取工艺条件为:乙醇体积分数60%、液料比50:1、提取温度60℃、提取时间2.0 h,此条件下提取获得花椰菜总黄酮含量为0.932 mg/g.[结论]正交试验优选的乙醇浸提工艺操作简便、合理可行,是提取花椰菜总黄酮的有效方法.  相似文献   

西兰花苗期生长模型的拟合和分析     

刘君  朱良其  黑银秀  刘灿  谢菲  何道根 《浙江农业学报》2016,28(12):2040

为研究西兰花苗期生长规律及物候期参数和生长参数特征,以台绿1号西兰花为材料,对西兰花苗期的生长状况进行连续观察,并用Logistic方程分别对株高、茎粗、鲜质量和干质量的生长动态过程进行拟合,获得Logistic生长模型、物候期与生长特征参数。结果表明,西兰花幼苗不同生长指标的生长变化规律基本一致,符合S型生长曲线,拟合方程的决定系数均达到0.981以上;各指标在播种后8 d陆续进入速生期,播种后33 d陆续进入缓增期,速生期的线性生长量占总生长量的60%以上;依S型生长曲线特点和西兰花幼苗生长特点将苗期分为渐增期、速生期和缓增期;模型验证表明,台绿1号西兰花苗期生长模型具有较好的可靠性。用Logistic方程可以拟合西兰花幼苗的生长动态,建议在幼苗速生期(播种后20~33 d)加强肥水管理,在苗龄33 d(四叶一心)时进行移栽定植。  相似文献   

Evaluating Inorganic Nitrogen and Rye-Crimson Clover Mixture Fertilization of Spring Broccoli and Lettuce by 15Nitrogen Tracing and Mass Balance     

Rickie L. Holness  Muchha R. Reddy  Carl R. Crozier  Carl E. Niedziela Jr. 《Journal of plant nutrition》2013,36(6):1033-1045

ABSTRACT

Broccoli (Brassica oleraceaL. var. italica) and lettuce (Latuca sativaL.) were grown under greenhouse conditions with nitrogen (N) from a cover crop mixture of rye (Secale cerealeL.) and crimson clover (Trifolium incarnatumL.) and ammonium nitrate (NH₄NO₃). Individual cover crop species were produced with non-enriched or enriched (5 atom % NH₄ ¹⁵NO₃) Hoagland Nutrient Solutions resulting in enriched rye [0.799% atom % ¹⁵N, 24:1 carbon (C):N ratio] and enriched clover (0.686% atom % ¹⁵N, 19:1 C:N ratio). Cover crops were applied as an equal mixture of rye and clover at 1884, 3768, and 5652 kg·ha^{? 1} dry weight to supply 26, 52, and 78 kg·ha^{? 1} N. Enriched materials were only applied at the 3768 kg·ha^{? 1} rate, either as enriched rye plus non-enriched clover or non-enriched rye plus enriched clover. Additional treatments consisted of an unfertilized control and three NH₄NO₃ fertilizer rates; 112, 224, and 336 kg·ha^{? 1} N for broccoli and 70, 140, and 210 kg·ha^{? 1} N for lettuce. Combination treatments were the standard cover crop rate (3768 kg·ha^{? 1}) plus the lowest N fertilizer rate for each vegetable. Cover crops did not increase yield of either broccoli or lettuce, and contributed only 17% of the N in broccoli and 15% of the N in lettuce. The majority of cover crop ¹⁵N remained in the soil: 54.8% and 81.3% of rye and clover N, respectively, after broccoli harvest; and 68.1% and 79.2% of rye and clover N, respectively, after lettuce harvest. Broccoli plant tissue recoveries were 8.0% of the rye and 11.0 % of the clover ¹⁵N; while lettuce plant tissue recoveries were 6.3% (rye) and 4.1% (clover). Broccoli yield could not be assessed due to lack of floret development, but dry matter accumulation was maximized at 224 kg·ha^{? 1}N. Lettuce yield and fertilizer N recovery efficiency (by mass balance) was maximized at 140 g·ha^{? 1} N.  相似文献   

甲霜·噁霉灵在控制西兰花苗期猝倒病上的应用价值初探     

钟列权  王会福  余山红 《江西植保》2014,(1):95-97

田间试验结果表明,30%甲霜·噁霉灵水剂对西兰花苗期基部猝倒病具有较好的防治效果,药效随着用药倍数的加大而上升,施药后16 d 30%甲霜·噁霉灵水剂1 500倍、2 000倍的校正防效分别达78.75%、73.33%,其中2 000倍的效果分别比对照药剂72.2%霜霉威盐酸盐水剂600倍、3%噻霉酮可湿性粉剂600倍高出3.12、24.64个百分点,且安全性好,因此可以在生产上加以推广应用。  相似文献   

我国西兰花应用价值及生产、出口前景分析   总被引：3，自引：0，他引：3  

王晓梅  崔坤  陆艳玲 《中国农学通报》2008,24(11):478-480

本文分析了西兰花应用价值、西兰花的生产情况、市场行情及促进西兰花生产、管理、标准的措施。从而为加快西兰花的生产与国际接轨的步伐提供参考。  相似文献   

西兰花切块去芯机构设计与试验     

陈建能  陈礼群  夏旭东  肖达度  韩瑞祥 《农业机械学报》2019,50(2):315-322

为了解决西兰花均匀、高效切块问题,在分析西兰花切块去芯理想轨迹基础上提出西兰花切块去芯机构,建立了运动学分析模型,开发了计算机辅助优化软件,并得到一组满足轨迹要求的机构参数。进行了机构的动力学仿真,仿真轨迹与理论优化轨迹基本一致,机构运动平稳,无受力过载现象。设计了西兰花切块去芯生产线,并进行高速摄像试验,试验结果与理想轨迹、仿真轨迹基本一致,刀具可适应满足出口要求的所有尺寸的西兰花切块,验证了西兰花切块去芯机构设计的合理性和优化的正确性;同时进行切块、去芯试验,切块成功率达91%,去芯成功率为100%,满足市场上西兰花小块的加工要求。  相似文献