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蔬菜机械化生产对提升作业效率和降低成本具有至关重要的作用,其中收获技术是影响蔬菜生产效益的重要因素。为提升蔬菜机械化收获技术水平并满足发展需求,结合国内外蔬菜机械化收获技术的研究现状,联系收获技术未来的发展方向,分析我国现阶段蔬菜机械化收获技术的发展需求,为我国蔬菜机械化收获技术的提高与应用提供参考依据。 相似文献
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蔬菜是慈溪市重要的经济作物,全市常年种植面积在2.67万hm2左右.长期以来,蔬菜种植采用传统生产方式,劳动强度大,工作效率低,机械化水平较低,广大农民对发展蔬菜生产全程机械化的需求一直十分迫切.近年来,随着慈溪市农业机械化水平的提高,蔬菜生产机械耕整、开沟、植保、排灌、施肥等环节机械化基本解决,栽植机械化技术取得重要突破,蔬菜生产机械化呈现良好的发展态势.但由于机具品种缺乏,机械性能较低,加之配套农艺技术尚未完善,全市蔬菜生产机械化总体水平较低,发展速度比较缓慢,一些关键环节(如收获)机械化仍是空白,尚处于初级阶段. 相似文献
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正南京市六合区是蔬菜生产大区,担负着南京城近三分之一的蔬菜生产供应任务,但蔬菜生产的机械化水平却相对落后,蔬菜生产与收获主要依靠人工作业。随着城镇化进程的加快和劳动力成本的不断提高,加快发展蔬菜生产机械化已迫在眉睫。 相似文献
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我国是一个蔬菜生产与出口大国,但蔬菜生产的机械化水平却相对落后,其中蔬菜收获机械在我国几乎还是空白,蔬菜的生产与收获主要是靠畜力或人工作业。因此,劳动力成本在蔬菜生产的总成本中所占的比重特别大。随着我国城镇化进程的加快和农村富余劳动力向非农产业的转移,劳动力成 相似文献
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感官检验棉花的品级,这是农村常见的一种检测手段.它的一个主要特点就是存在不确定性.这是由于检验员的品级检验水平存在一定的差异,其中有很多因素制约着检验的结果.文章对影响感官检验结果的因素进行了系统的分析. 相似文献
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《Journal of Agricultural Engineering Research》1998,69(3):249-254
A model to represent the discolouration of dried powder of carrots as a function of temperature was developed. Two types of carrots, Asian and European, containing large amount of lycopene and β-carotene, respectively, were tested. The dried powder was stored under an atmosphere with O2and at three different temperatures, 5,20 and 35°C. The surface colour of the powder was monitored during storage by a Hunter colour ratioa/b. In the proposed model, the rate of oxidation was assumed to be represented by the product of the fraction of concentration of oxidized pigment at arbitrary time and a specific rate of oxidation of pigment. The rate parameters in the proposed model were calculated by fitting the experimental data with smooth curves by trial and error at the end of the induction period but before discolouration took place. The frequency constant and activation energy, expressing the temperature dependence of the rate parameters, were expressed by the Arrhenius relation. The simulation results of a Hunter colour ratioa/bof dried powder at 25°C showed good agreement with the experimental data, suggesting that the proposed model was effective for the prediction of discolouration of dried powder of both types of carrot. The use of the induction period in the manner described may enable the shelf life of dried powder to be predicted. 相似文献
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从灾害经济学的角度探讨了城镇供水优化调度的必要性和可能性,认为在缺水不可避免的情况下,对供水进行优化调度可以减小缺水带来的损失,产生较好的减灾效益,特别是可以大大减小严重干旱的灾害效应。并根据水资源的特性,提出了缺水损失的计算模式以及优化调度的原则和方法。 相似文献
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