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农业机械化是现代农业的重要物质基础,发展农机化是提高农业综合生产能力、改善农业生产条件、提高生产率、促进农村经济发展的重要途径,是建设社会主义新农村的重要组成部分. 相似文献
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近年来,我国粮食总产量有所减少,没有新的突破,粮食安全问题相对突出,而提高粮食生产能力是确保粮食安全的重要手段,因此需要准确把握主产区粮食生产能力的影响因素,科学制定提高粮食生产能力的策略。农业机械化的发展是现代农业建设的前提与基础,有利于推动农业生产,降低劳动强度,促进劳动生产率的提高,因此研究农业机械化发展对粮食生产能力的影响十分之必要。本文就针对农业机械化发展对粮食生产能力的积极影响进行分析和探讨。 相似文献
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梯田是山区提高农业综合生产能力、防止水土流失、改善生产生活条件的重要途径,地处黄土高原地区的庄浪县40多年来的梯田建设印证了梯田建设的重要性和它发挥的作用。本文从梯田的减灾与农业生产能力的提高、梯田建设与农业生产良性循环体系等方面进行了分析。研究结果表明,庄浪梯田建设已构建起两大支撑体系:一是促进农民增收的产业体系,二是增强了粮食生产能力的保障体系。同时,较少的耕地提供了较多的粮食产量,为农业结构调整奠定了基础。更重要的是,在梯田建设中,山、水、田、林、草、路综合治理,使农业生产条件得以改善并实行集约经营,从而推进了传统农业向现代农业转变。本文的研究对庄浪水土流失、农业生产建设具有一定的借鉴作用。 相似文献
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发展设施农业可以有效缓解干旱气候对农业生产的影响.近年来,北票市大力扶持设施农业建设,通过改善设施农业生产条件、加强农业信息化建设、加强灾害性保险建设、做好市场营销建设以及提升科技服务水平等措施促进设施农业发展,提高设施农业综合生产能力. 相似文献
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加快农业生产机械化,提高农机装备水平,是改善农业生产条件,提高劳动生产率、土地产出率和资源利用率,增强农业综合生产能力,保障农产品有效供给的重要措施。是推进农业生产经营体制改革,实现农业规范化、标准化、集约化、产业化的重要途径。各级政府应积极引导建设农机合作组织,以市场为 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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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
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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