SYJ-2型液肥变量施肥机设计与试验   总被引：3，自引：0，他引：3  

王金武  潘振伟  周文琪  王金峰  何剑南  郎春玲 《农业机械学报》2015,46(7):53-58

变量施肥技术是精准农业的重要组成部分,依据农业生产要求设计了与轮式拖拉机配套的SYJ-2型三点悬挂式液肥变量施肥机。以单片机作为核心处理器,以电磁比例调节阀为执行部件,设计编写了液肥变量控制系统以及与硬件配套的上位机软件,用于采集数据与发送命令;关键部件内腔式旋转扎穴机构采用5个全等椭圆齿轮传动,液肥在内腔流动,在减少外部连接软管的同时,防止了管路缠绕;液肥分配器的功能是适时开启和关闭,实现液肥的不连续射出,进而完成穴施作业;同时对内腔式旋转扎穴机构和液肥分配器进行了结构设计。田间试验结果表明,施肥深度为地表12~15 cm,施肥精度为99.1%,满足液态变量施肥作业要求。  相似文献   

超高压技术在粮食产品加工中的应用   总被引：1，自引：0，他引：1  

于勇  潘芳  苏光明  詹耀  朱松明 《农业机械学报》2015,46(10):247-256,297

超高压技术是一种非热加工技术,因具有杀菌、保持食品原有营养成分、护色等特点,在食品行业的应用已越来越广泛。目前,超高压技术在粮食产品加工方面的应用发展较快,随着对该技术研究的不断深入,其在粮食产品加工中所发挥的作用也越来越受关注。阐述了国内外超高压技术在粮食产品淀粉改性、蛋白质改性、成分提取、致敏性降低、贮藏(灭菌灭芽)等方面的研究进展,分析了各方面研究结果的意义、应用价值和前景,并对今后应重点关注的研究方向提出了建议。  相似文献   

铁皮石斛人工繁育技术     

黄艳艳  仉劲  付均惠  张攀  秦宁  李国清 《北方园艺》2021,(2):115-123

以铁皮石斛商品瓶苗和盆栽苗茎段为试材,添加不同浓度6-BA、NAA,诱导茎段腋芽、原球茎和不定根,建立再生体系,快速繁殖铁皮石斛组培苗,以期为秦岭淮河一线以北地区人工繁殖铁皮石斛提供参考依据。结果表明:外植体宜采用70%酒精浸泡20 s,0.1%升汞浸泡8 min消毒;MS+6-BA 3.0~5.0 mg·L^-1+NAA 0.1~1.0 mg·L^-1适合腋芽分化和增殖,分化率92%~100%;1/2MS+6-BA 2.0 mg·L^-1+NAA 0.5 mg·L^-1+土豆泥15%适合原球茎诱导增殖,增殖倍数7.7;1/2MS+NAA 0.3 mg·L^-1生根率为100%;以松针土移栽,成活率83%。  相似文献   

比久和多效唑混合物的高效液相色谱分析   总被引：3，自引：1，他引：3  

王晓容  李建光  潘学文  匡石滋  戴宏芬  李荣 《华中农业大学学报》2002,21(6):523-525

在吸光度为210nm、流动相配比为甲醇：乙腈：水＝40：20：40的条件下，多效唑和比久均能得到很好的分离。比久的保留时间约为3．19min，多效唑的保留时间约为11．83min。加标回收率：比久为108．69％，多效唑为90．39％。  相似文献   

Adsorption kinetics of 17α-ethinyl estradiol and bisphenol A on carbon nanomaterials. II. Concentration-dependence     

Bo Pan  Ke Sun  Baoshan Xing 《Journal of Soils and Sediments》2010,10(5):845-854

Purpose  

Carbon nanomaterials (CNMs) have attracted a great deal of research interest for their potential environmental applications because of their unique properties. Adsorption of organic chemicals on CNMs was reported to be important in controlling their environmental risks. However, the kinetics of the adsorption is hardly investigated in literature. The objective of this work was, therefore, to quantitatively describe the sorption kinetics of 17 α-ethinyl estradiol (EE2) and bisphenol A (BPA) on CNMs as compared to activated carbon (AC).  相似文献   

Effects of Neutral Phytase Supplementation on Biochemical Parameters in Grass Carp,Ctenopharyngodon idellus,and Gibel Carp,Carassius auratus gibelio,Fed Different Levels of Monocalcium Phosphate     

Liwei Liu  Yuliang Luo  Xu‐Fang Liang  Weimin Wang  Junjie Wu  Jing Pan 《Journal of the World Aquaculture Society》2013,44(1):56-65

Two 8‐wk studies were conducted to evaluate the effects of neutral phytase supplementation on hemato‐biochemical status, liver biochemical parameter, and intestinal digestive enzyme activity of grass carp, Ctenopharyngodon idellus, and gibel carp, Carassius auratus gibelio, fed with different levels of monocalcium phosphate (MCP). The control diet was prepared with 2% MCP but without phytase (P2.0). The other three experimental diets were prepared with the addition of 1.5, 1.0, and 0.5% MCP, respectively, when supplemented with 500 U/kg neutral phytase in each diet and designated as PP1.5, PP1.0, and PP0.5, respectively. The results indicated that the serum alkaline phosphatase (ALP), alanine transaminase (ALT), and aspartate transaminase (AST) activities, as well as the albumin (ALB) content were increased in grass carp (P < 0.05) and gibel carp (P > 0.05) fed with phytase‐supplemented diets. Meanwhile, the serum cholesterol, high‐density lipoprotein, and total protein contents of the two species of fish were increased in comparison to the control. In addition, dietary phytase inclusion did not significantly affect hepatic ALP, ALT, and AST activities in the two species of carp fed with different levels of MCP. Amylase activity increased in foregut and hindgut of both species when fed with the phytase‐supplemented diets while lipase activity was reduced in the foregut and hindgut in both fish. This study suggests that neutral phytase supplementation increases serum ALP, ALT, and AST activities but does not notably affect these enzyme activities in the liver of the two species of carp when fed different levels of MCP. On the other hand, amylase activity increased while lipase activity was reduced in the intestine of the species of carp fed with phytase‐supplemented diets.  相似文献   

Effects of grazing and rainfall variability on root and shoot decomposition in a semi-arid grassland     

Marcus Giese  Ying Zhi Gao  Ying Zhao  Qingmin Pan  Shan Lin  Stephan Peth  Holger Brueck 《Applied soil ecology》2009,41(1):8-18

Overgrazing increasingly affects large areas of Inner Mongolian semi-arid grasslands. Consequences for ecosystem functions and, in particular, for the decomposition as a key process of ecosystem carbon (C) and nitrogen (N) cycling are still unclear.We studied the effects of grazing on shoot and root decomposition with the litter bag method in a long-term grazing exclosure (UG79), a moderate winter grazed (WG) and a long-term heavily grazed site (HG). We separated the effects of local environmental factors and litter quality as altered by grazing. Growing seasons of average and very low precipitation allowed us to study the effect of inter annual rainfall variability on decomposition.Grazing-induced differences in environmental factors of the three studied grassland sites had no effect on decay rates of shoot and root dry mass. Also differences in litter quality among the grazing sites were not reflected by root decomposition dynamics. The accelerated shoot decay at site HG could not clearly be linked to litter quality parameters. Shoot decay rates were more or less constant, even under very dry conditions. This indicates the possibility of photodegradation (solar UV-B radiation) to control aboveground decomposition in this semi-arid ecosystem. By selecting the best predictors of root decomposition from regression analysis, we found that soil water content was the best parameter explaining the dynamics.Net N immobilization was generally not detected during the decay process of shoot and root. It is likely, when root decomposition is strongly reduced in dry periods, shoot decomposition becomes relatively more important for nutrient cycling. A separate analysis of shoot and root decay dynamics is required in order to describe C and N cycling in this semi-arid grassland. The grazing impact on C and N fluxes through decomposition of plant material likely exhibits a strong interaction with seasonal rainfall pattern.  相似文献   

纳米CuI催化偶联反应合成二苯醚类农药中间体     

潘攀  蔡振亚  叶加久  杨春燕  徐小岚 《现代农业科技》2010,(9):25-26

二苯醚是一种重要的农药中间体,通过W/O微乳法,制备出形貌均一的球状纳米CuI,并应用于催化C-O交叉偶联反应中,在温和的反应条件下,合成了具有优良产率的二苯醚类化合物,该方法可在今后的农药合成中应用。  相似文献   

昆明都市农业的地位和作用研究——基于滇中城市经济圈一体化发展的视角     

李茂萱  陈攀  张云倩 《云南农业大学学报(自然科学版)》2010,4(4):15-18

随着《云南省滇中城市经济圈区域协调发展规划》的出台，昆明市作为经济圈的核心，其农业发展为加快经济圈的一体化进程、保持圈内经济社会的和谐发展，将产生重要作用。分析了在经济圈一体化发展格局下，昆明都市农业的地位和功能，以及都市农业发展的内涵拓延，并提出了相关政策建议。  相似文献   

天台国清寺景区马尾松枯死的初步研究   总被引：1，自引：0，他引：1  

潘昌尧  庞升烈 《浙江林业科技》1999,19(1):20-22

经调查结果表明，天台县国清寺景区马尾松枯死的原因是，林分密度大、树种单一、松树生长衰弱、松墨天牛危害严重引起松树大量流脂导致逐渐枯死，但尚未发现松材线虫病危害。加强抚育管理，调整林分结构，培植阔叶树种，逐渐形成混交林，是国清寺景区风景林的发展方向。  相似文献