共查询到20条相似文献，搜索用时 62 毫秒
1.
2.
通过近年来国内外试验、示范、推广应用地下滴灌技术的实践经验,对地下滴灌系统规划设计、运行管理有关问题进行了总结和阐述,对滴灌管线的选取、适宜埋设深度的确定、灌水小区的冲洗、真空阀的设置、水质处理等地下滴灌系统设计应用常见问题逐一进行了说明,可为地下滴灌技术在我国的进一步推广应用提供参考。 相似文献
3.
地下滴灌技术是微灌技术的典型应用形式,被公认为最有发展前途的高效节水灌溉技术之一.通过对滴灌技术的发展历史和现状进行分析,详细阐述滴灌技术在农业生产中的应用技术和设计方法,指出滴灌技术具有节水、增产等优点,对农业可持续发展具有重要意义. 相似文献
4.
孙学文 《农业机械化与电气化》2011,(6):105-106
地下滴灌技术是微灌技术的典型应用形式,被公认为最有发展前途的高效节水灌溉技术之一。通过对滴灌技术的发展历史和现状进行分析,详细阐述滴灌技术在农业生产中的应用技术和设计方法,指出滴灌技术具有节水、增产等优点,对农业可持续发展具有重要意义。 相似文献
5.
6.
《排灌机械工程学报》2015,(11)
为了未来中国滴灌技术与滴灌产品、装备更好地发展、推广和应用是灌溉行业需要思考总结的问题.文中结合中国农业生产的新形势,分析了滴灌技术总体发展趋势,认为未来滴灌应用范围会更广阔,将更加体现技术集成和智能灌溉理念,更加强调能源资源的高效利用.在此基础上,对滴灌理论与技术以及滴灌装备与制造等方面的发展进行了若干思考和总结:认为在理论技术上,需加强管网优化、多水源滴灌系统、低能耗滴灌等方面研究;而在产品研发上,大流量过滤器、精准施灌设备、新型灌水器、智能化硬件和软件、滴灌铺设回收装置等滴灌新产品需进一步强化研制研发.同时呼吁建立完善的滴灌基层服务队伍.可为滴灌技术与装备的改进提供一定的借鉴. 相似文献
7.
旱区农业要大力推广喷灌与滴灌机械化 总被引：1，自引：0，他引：1
经过对喷灌与滴灌技术原理的探讨,提出旱区农业要发展推广喷灌和滴灌技术,并就喷灌与滴灌技术应用中的选型、配置、安装等方面的问题作分析。 相似文献
8.
9.
通过推广应用日光温室滴灌节水技术,对工程建设管理中的培训教育、灌溉技术与农艺栽培技术的融合、解决技术难点、技术试验研究、示范引导、设备管护等方面的具体措施进行了进一步的探讨,在主管、滴灌带以及超长度温室滴灌主支管等工程设备配套安装技术方面做了一定的改进,分析总结了技术优点,为推广日光温室滴灌节水技术提供了可行的方法。 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