共查询到20条相似文献，搜索用时 687 毫秒
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为达到蓝莓提前上市、获得更大经济效益的目的,本团队将南方蓝莓移至环境可控型智能温室中试验生产,探索研究出南方蓝莓智能温室促早熟生产控制技术。首先从蓝莓物候期、品种特点、土壤pH、水肥灌溉方式、小气候环境区间等方面进行了较为详细全面的调研与总结,明确了无土栽培蓝莓全周期管理要点和环境调控范围;接着基于Venlo型温室对蓝莓生产做布局,并基于物联网技术,建立蓝莓植物工厂化生产控制系统,串联硬件层、软件层和云端,实现现场端环境检测调控、数据云存储与远程控制等技术;在温室环境多因子协调控制模型基础上,针对蓝莓生长环境特点,探索研究了一套蓝莓温室多因子协调控制算法,用于环境调控。试验温室位于江苏省苏州市昆山市花桥镇东南部。经实际验证,整体调控系统效果显著,并于2021年5月初采收了第一波果实,使南方品种蓝莓提早近一个月进入果实采摘期。其中相比未蓄冷的蓝莓植株,蓄冷后的“明星”“绿宝石”“蓝美1号”“海岸”单株产量分别增加51.5%、85.5%、43.8%和94.7%,单果重量分别增加10.9%、7.2%、2.6%和5.3%。试验证明采用多因子协调控制算法进行调控能够提高蓝莓的产量和品质,取得显著经济效益,为南方温室蓝莓植物工厂化促早熟生产管理提供示范。 相似文献
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排种盘排种性能试验研究 总被引：2，自引：0，他引：2
工厂化育苗由于较传统的育苗方式有诸多的优点而日益受到人们的重视。随着我国设施园艺的快速发展,机械化育苗设备也有了较快的发展,相应的机械化育苗设备的核心工作部件—精密播种装置的重要性在整个工厂化育苗环节中显得更加突出。Perfect300是集制钵播种为一体的联合作业机组,其中排种盘的工作性能直接影响着整个机组研发和使用。为此,通过正交试验对影响排种性能指标的诸因素进行了研究,确定了影响试验因素的主次顺序以及因素的最优组合,为排种盘的设计提供了理论依据。 相似文献
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工厂化农业是我国面向21世纪农业现代化的发展方向,是实现农业可持续发展的重要措施.种苗的工厂化生产是工厂化农业的重要组成部分.充分利用温室设施,建立良好的幼苗生长环境控制系统,实现种苗的工厂化生产,能缩短育苗时间,节约种子用量,降低种苗生产风险,提高种苗质量,有利于推广优良蔬菜、瓜果和花卉品种.在美国、荷兰、以色列等国,种苗工厂化生产已形成了独立的先进的产业.企业用先进的生产设施及相配套的生物、工程技术,采用规模化、工厂化生产方式,运用商业化的经营管理,获得了种植业中最高的经济效益. 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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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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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