共查询到20条相似文献,搜索用时 62 毫秒
1.
2.
介绍了广西壮族自治区博白县水稻生产全程机械化发展的现状,分析了水稻生产全程机械化发展中存在的问题,结合从事水稻生产机械化推广的实践,提出了加快水稻生产全程机械化发展的对策。 相似文献
3.
阐述了推广应用水稻机械化生产技术的重要意义,水稻机械化生产技术的主要内容,推广应用水稻机械化生产技术存在的主要问题,促进水稻机械化生产技术推广应用的措施。 相似文献
4.
<正>当前如何优化水稻生产各环节,进一步提高综合机械化水平及水稻产量成为亟待解决的问题。本文从水稻生产的育插秧、田间管理、机械化收获等环节分析了机械化生产中存在的问题,并提出了相应的建议,以便于突破水稻生产中的薄弱环节,进一步提高水稻生产的机械化水平,探索走出一条水稻机械化生产的新道路,促进水稻丰产丰收。一、水稻生产机械化技术应用中存在的问题1.水稻育插秧环节人力投入较高。水稻机械化育插秧是目前稳产稳收的生产方式, 相似文献
5.
我国水稻种植机械化概况及发展方向 总被引:2,自引:0,他引:2
与发达国家相比,我国水稻生产机械化水平依然很低,尤其是水稻种植机械化水平更低.本文论述了我国水稻种植机械化发展概况和存在的问题,提出我国了水稻种植机械化的发展方向,通过水稻种植机械化促进我国水稻生产机械化的发展. 相似文献
6.
7.
水稻种植季节性强、用工量多、劳动强度大,为了解决这一难题,我县承担的水稻生产机械化插秧示范推广项目:"水稻机插秧"工作,解决了水稻生产全程机械化发展的问题,开拓出水稻生产机械化的新路子。一、水稻生产机械化的技术革命水稻机械化插秧技术是继品种和栽培技术更新之后进一步提高水稻生产机械化的一次技术革命。我县引进使用的 相似文献
8.
9.
与发达国家相比,我国水稻生产机械化水平依然很低,尤其是水稻种植机械化水平更低。本文论述了我国水稻种植机械化发展概况和存在的问题,提出我国了水稻种植机械化的发展方向,通过水稻种植机械化促进我国水稻生产机械化的发展。 相似文献
10.
11.
12.
13.
14.
15.
《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
16.
17.
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
18.
19.
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
20.
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