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近几年来,随着农村经济高速发展和新的农机服务体系的建立,崭新的水稻生产机械化高潮呈现在大家面前。从天津市水稻生产机械化推广角度剖析,水稻生产机械化技术要难于旱田机械化技术。水稻生产机械化技术由两方面组成。一是水稻机械化农机具技术。它是指水稻生产用机具... 相似文献
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文章通过分析广西近年水稻机械化生产推广的实践和思路,对我国南方地区水稻机械化生产技术模式进行探讨。提出各地应根据本地的特点,因地制宣,找准水稻机械化生产的切入点,走选择性发展水稻机械化生产技术模式的道路,使传统农业向现代农业跨越,全面推进南方水稻机械化生产。 相似文献
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水稻是辽宁省仅次于玉米的第二大粮食作物,2000年全省水稻种植面积为490千公顷,产量达到396万吨,面积和产量分别占全省粮食作物的1/6和1/4,水稻生产在辽宁省粮食生产中占有重要地位。农业机械化在促进水稻生产上发挥了突出作用,并向全程机械化方向发展。水稻生产全程机械化主要体现在四个方面:耕整地、栽植、收获和烘干,水稻栽植、收获和烘干机械化为水稻生产全程机械化的重点和难点。目前辽宁省水稻生产过程中,栽植和收获机械化水平分别为7%和17%,烘干机械化刚刚起步。水稻生产机械化水平偏低,制约了全省水… 相似文献
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1998年原农机化司魏克佳司长在我县调研工作时曾强调:“武鸣县作为水稻生产机械化100个示范点之一,应该在广西率先实现农业机械化。”这为我区、我县的农机人给予极大的鼓舞和动力,也给我们实现水稻生产机械化增强了信心和坚定了信念。去年区农机局《关于加快发展我区水稻生产机械化意见》中明确指出,水稻生产的综合机械化水平要达到53%以上。这给水稻生产机械化提出了明确的任务。1 水稻生产机械化是我县实现农业机械化的主体 武鸣县水稻种植面积3.67万hm2,占全县粮食种植面积的67%。如果在我县实现了水稻生产机械化,可以说我县的农… 相似文献
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我国是世界上水稻生产大国,南方是我国水稻的主产区,福建省是南方十五省(区)水稻主产区之一,其水稻播种面积达2000万亩以上,占粮食播种面积的70%。水稻生产机械化是农业机械化的重要组成部分,没有水稻生产全程机械化就没有农业机械化。 相似文献
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本文分析福建省水稻生产机械化的现状,借鉴世界发达国家、地区全面实现水稻生产机械化的成功经验,探讨在社会主义市场经济体制下,福建省水稻生产机械化的前景与发展对策。 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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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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The fractional outflow rate of water from the rumen, measured as the rate of disappearance of the chromium complex of ethylenediamine tetra-acetic acid, was related to a number of dietary factors. A multiple regression equation was derived which expressed fractional outflow rate as a function of the intakes of dry matter, ash, acid-detergent fibre and crude protein.The data analysed consisted of 243 observations for sheep on 59 diets, including forage, concentrate and mixed diets. The ranges covered by the data were: fractional outflow rate 0.7–3.6 day?1; dry matter intake 560–1400g/day; ash 4–30%, acid-detergent fibre 7–41%, crude protein 5–26 % of dry matter; there were no observations for sheep of less than 34 kg liveweight.The equation accounted for 56·3 % of the total variance. Between-sheep variance could not be calculated for the whole of the data but was undoubtedly substantial since, for a sixth of the data, it was known to account for 38 % of the total variance. 相似文献