共查询到20条相似文献，搜索用时 421 毫秒
1.
2.
日光温室蔬菜生产是辽宁地区农民增收的主要途径之一。日光温室蔬菜种植面积不断扩大且常年不间断生产,导致低温、寡照、暴风雪及土壤药害等问题出现。针对日光温室常见灾害提出应对措施,以期为提高日光温室蔬菜产量及品质提供参考。 相似文献
3.
番茄作为北京市重要的大宗蔬菜之一,其设施生产面积占到北京市所有蔬菜设施生产面积的60%以上,因其喜温喜光的生长特性,北方地区秋冬季节番茄栽培多采用传统的土墙式日光温室种植。日光温室是北方地区秋冬季蔬菜的主要生产方式之一,但受结构空间限制,目前日光温室内蔬菜生产主要以人工作业为主,劳动强度大,作业效率低,严重制约了设施蔬菜的生产。受制于设施瓜果类蔬菜采摘机械化技术尚未成熟的现状,本着“由易到难,逐步推进”的原则,为实现日光温室果菜(番茄)生产关键环节机械化,在开展前期试验示范的基础上,形成了日光温室番茄生产关键环节机械化技术装备配套方案。 相似文献
4.
日光温室蔬菜东西方向种植优势分析 总被引：1，自引：0，他引：1
介绍了沛县日光温室蔬菜生产情况及设施蔬菜机械化发展中存在的问题,论述了改南北方向种植为东西方向种植的必要性,并结合试验示范情况,分析了东西方向种植的经济效益、社会效益和生态效益。 相似文献
5.
6.
7.
11月28日，北京市农机试验鉴定推广站工作人员深入延庆县康庄镇小丰营蔬菜种植基地，对11月3日雪后坍塌的日光温室进行实地考查，经与农户沟通后，制定了卷帘机修缮技术方案。目前， 相似文献
8.
9.
日光温室蔬菜机械化生产的效益分析 总被引：2，自引：0，他引：2
结合长子县试验区的建设情况,通过对日光温室蔬菜产业技术要领、机具设备配备、效益等关键因素进行详细分析充分说明了日光温室蔬菜种植过程中应用机械化所产生的巨大效益,并进一步提出今后农村发展日光温室存在的主要问题和发展对策。 相似文献
10.
随着农业产业结构的调整，高效节能日光温室建设如雨后春笋般蓬勃发展，特别是在高海拔山区建设日光温室，发展蔬菜种植，为山区经济注入了新的活力。２００１年秋季，我们在海拔１１０４m的翼城县上吴东村探索性地建设了１０栋、占地面积近４０００m２的日光温室，进行反季节喜温蔬菜———黄瓜的栽培种植，平均每６６７m２温室生产黄瓜５８５０kg，单棚收入达６０００元左右，取得了较好的社会效益和经济效益。通过１年来的探索与实践，我们认为在高海拔山区发展日光温室应注意解决好以下几方面的问题。１．选用适宜构型高海拔山区由于受… 相似文献
11.
Overland water and salt flows in a set of rice paddies 总被引：1，自引：0，他引：1
E. Playn O. Prez-Coveta A. Martínez-Cob J. Herrero P. García-Navarro B. Latorre P. Brufau J. Garcs 《Agricultural Water Management》2008,95(6):645-658
Cultivation of paddy rice in semiarid areas of the world faces problems related to water scarcity. This paper aims at characterizing water use in a set of paddies located in the central Ebro basin of Spain using experimentation and computer simulation. A commercial field with six interconnected paddies, with a total area of 5.31 ha, was instrumented to measure discharge and water quality at the inflow and at the runoff outlet. The soil was classified as a Typic Calcixerept, and was characterized by a mild salinity (2.5 dS m−1) and an infiltration rate of 5.8 mm day−1. The evolution of flow depth at all paddies was recorded. Data from the 2002 rice-growing season was elaborated using a mass balance approach to estimate the infiltration rate and the evolution of discharge between paddies. Seasonal crop evapotranspiration, estimated with the surface renewal method, was 731 mm (5.1 mm day−1), very similar to that of other summer cereals grown in the area, like corn. The irrigation input was 1874 mm, deep percolation was 830 mm and surface runoff was 372 mm. Irrigation efficiency was estimated as 41%. The quality of surface runoff water was slightly degraded due to evapoconcentration and to the contact with the soil. During the period 2001–2003, the electrical conductivity of surface runoff water was 54% higher than that of irrigation water. However, the runoff water was suitable for irrigation. A mechanistic mass balance model of inter-paddy water flow permitted to conclude that improvements in irrigation efficiency cannot be easily obtained in the experimental conditions. Since deep percolation losses more than double surface runoff losses, a reduction in irrigation discharge would not have much room for efficiency improvement. Simulations also showed that rice irrigation performance was not negatively affected by the fluctuating inflow hydrograph. These hydrographs are typical of turnouts located at the tail end of tertiary irrigation ditches. In fact, these are the sites where rice has been historically cultivated in the study area, since local soils are often saline-sodic and can only grow paddy rice taking advantage of the low salinity of the irrigation water. The low infiltration rate characteristic of these saline-sodic soils (an experimental value of 3.2 mm day−1 was obtained) combined with a reduced irrigation discharge resulted in a simulated irrigation efficiency of 60%. Paddy rice irrigation efficiency can attain reasonable values in the local saline-sodic soils, where the infiltration rate is clearly smaller than the average daily rice evapotranspiration. 相似文献
12.
车用发动机润滑油失效规律与更换周期研究 总被引：7，自引：0，他引：7
研究在正常使用条件下１０Ｗ／３０－ＱＣ级润滑油用于某型车用发动机时所表现的失效规律,确认期服从两参数Ｗｅｉｂｕｌｌ分布,并给出分布的尺度参数η和形状参数ｍ之最佳线性无偏估计（ＢＬＵＥ）同时,还为定量分析,计算车用发动机润滑油的使用可靠性和合理确定其更换周期提供了一套可供借鉴的方法,并给出了具体的计算实例。 相似文献
13.
14.
赵国杰 《农业机械化与电气化》2011,(4):106-107
乡（镇）农技推广体系是农业发展的关键。介绍朝阳市农业技术推广体系的现状,针对目前体制及运行机制、服务手段等方面存在的问题,提出适合朝阳市乡（镇）农技推广体系改革与发展的对策,以期对全省农技推广体系改革和发展起到一些借鉴作用。 相似文献
15.
苑庆刚 《农业机械化与电气化》2010,(3):52-54
草莓果味酸甜爽口,营养价值高,为人们所喜爱的应市鲜果之一。由于草莓易受损伤和微生物侵染,因此其采收、贮藏过程极为重要。介绍草莓采收过程中的注意事项以及11种贮藏保鲜技术的实施步骤和操作方法,推介9种加工方式,为草莓产业化提供技术支持。 相似文献
16.
对引进的谷子新品种金谷子耐旱TG118进行品种比较试验和多点试种。结果表明：该品种抗旱、耐瘠、适应性强,稳产、高产、抗病抗风抗倒伏强,品质优良,粮草兼用,种植简单,省工易管;一般产量在6000kg/hm2以上,比当地主栽品种增产20%以上。最高产量达9450kg/hm2,适于在辽西北地区推广应用。 相似文献
17.
对《种子法》存在问题的探讨 总被引：1，自引：0，他引：1
李鹏 《农业机械化与电气化》2011,(6):129-130
《种子法》是我国种植业第一部法律。自实施以来,为依法加强种子管理提供了有力的法律支撑,促进我国种子产业发生翻天覆地的变化。但随着依法管理工作的深入和种子产业的快速发展,《种子法》及配套规章的一些问题逐步显现出来。对《种子法》及配套规章存在的问题进行深入分析,对需要进一步补充的章节以及需要调整的内容进行深入探讨,以求更加完善和明确。 相似文献
18.
瓦房店市是我国重要的水果生产基地,在国内水果生产领域占有重要地位。随着水果市场化的不断深入,如何满足和适应国内外市场需求成为瓦房店市水果生产的关键问题。从瓦房店市水果生产实际出发,阐述了实施水果生产标准化的必要性,提出了发展水果生产标准化的具体措施。 相似文献
19.
在新世纪,面对机遇和挑战,党的十六大把“社会更加和谐”作为全面建设更高水平的小康社会的一个重要目标。中国人素有社会和谐的理想;西方人自古也向往社会和谐;借鉴东西方两种和谐社会思想的经验、教训,构建社会主义和谐社会理论。 相似文献
20.
About 30 years have passed since the Government of Egypt embarked on implementing a series of large scale drainage projects. At present, about 3.8 million acres have been provided with drainage systems on the basis of systematic pre-drainage investigations and designs. The target is to provide drains in approximately 6.4 million acres in the Nile Valley and Delta.The implementation of the subsurface drainage system is carried out by the public sector and private contractors under direct supervision of governmental regional departments. The implementation process depends on many factors related to the drainage material, machinery, manpower, site requirements, farmers and organizations involved. Problems and constraints are sometimes challenging, however, the annual rate of implementation has gradually increased to 170,000 acre/year.This paper discusses the different aspects involved in the implementation process of drainage systems. The development in materials, machinery and construction technologies will be reviewed. Institutional and management factors are going to be also considered. 相似文献