甜椒套甜瓜 亩收两万元     

王明照 《当代农业》1998,(12):40-40

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无油管采油技术的原理与应用     

秦守栋  王明鹏  李煊  金志强 《山东饲料》2009,(2)

在常规有杆抽油方式中,用油管和抽油杆作为配套管柱,耗材多,泵效低。无油管采油技术为解决上述问题另辟了溪径。无油管采油技术是用空心杆代替油管和实心抽油杆,将泵筒直接悬挂在套管上,用空心杆带动柱塞完成抽油过程。该技术泵效高,可降低成本,减少劳动强度,并直接解决了由实心杆和油管组成的管柱所无法避免的管杆偏磨问题。  相似文献   

牟柿逡滴穹桨干杓粕蚱嫱本┯实绱笱С炭     

亟换患际跤胪ㄐ磐抑氐闶笛槭? 《新疆农业科学》2004,(Z1)

0070003000476-77卫星通信与“村村通”电话工程丛海嵩亚洲卫星有限公司0通讯世界Telecom World75TN927.2I136;9;II136_9;丛海嵩000700030010000478千兆以太网测试解决方案(下)美国胜利电讯公司0通讯世界Telecom  相似文献   

网棚韭菜无公害生产配套栽培技术   总被引：1，自引：0，他引：1  

崔绍玉  王明耀  张贵海  王学颖  温素平 《中国果菜》2009,(3):28-29

韭菜的无公害栽培技术，品种选择、整地施肥、播种、田间管理、病虫害坊治。  相似文献   

用鸡粪作饲料养殖成鱼试验     

田玉生  李海波  王明 《黑龙江水产》2009,(1):16-17

近年来，鱼饲料价格猛涨，而鱼的价格涨幅不明显，严重影响了养鱼效益。为降低养鱼成本，广辟饲料来源，笔者于2006年以鲜鸡粪为主直接代替部分精料制成配合饲料，喂养成鱼，取得了较好的效果。现总结如下：  相似文献   

索南达杰:你的生命献给了藏羚羊     

王明 《中国林业》2006,(3)

可可西里,日出日落。直插苍穹的索南达杰纪念碑,如今显得更加肃穆庄严。今天,在藏羚羊“申吉成功后,我们不能忘却英雄留下的足迹。1994年1月,在鲜为人知的可可西里倒下了中国第一位为保护藏羚羊而献出生命的政府官员———索南达杰。杰桑·索南达杰,治多县索加乡人,生于1954年,1974年毕业于青海民族学院,毕业后要求返回治多县工作。他从学校教师做起,先后担任县文教局局长、索加乡党委书记、治多县县委副书记。在他的倡导下,治多县为开发西部地区和制止日益猖獗的淘金、偷猎活动,成立了治多县西部工作委员会,索南达杰担任西部工作委员会书记…  相似文献   

竹小蜂的化学防治试验     

莫建初  王问学  王明旭  汤科海  秦松柏  陈明武 《林业实用技术》1992,(9)

竹小蜂在湖南省严重危害楠竹。1991年4月下旬至5月下旬,采用4种农药进行防治试验表明,竹腔注射40%氧化乐果乳油原液2毫升或1:5倍液10毫升,防治效果在94.6%以上。在竹林大年时于4月下旬至5月上旬,用40%氧化乐果注射林内的小年竹腔,可有效地防治竹小蜂的危害,且工效高,成本低,易推广。  相似文献   

Growth and nutrient accumulation of Brazil nut trees (Bertholletia excelsa) in agroforestry at different fertilizer levels     

G?tz Schroth  Maria do Socorro Souza da Mota  Maria Elizabeth de Assis Elias 《林业研究》2015,26(2):347-353

The Brazil nut tree(Bertholletia excelsa) is a frequent component of agroforestry systems in the Amazon because of its adaptation to nutrient-poor upland soils and multiple uses.We investigated the aboveground biomass production(kg dry weight),nutrient uptake and requirements(N,P,Ca,Mg,K) of Brazil nut trees of different sizes grown under agroforestry conditions and fertilized at different levels.Eight of 70 experimental trees with different size were harvested and stem,branches and leaves were separated.Nutrient contents were determined for three trees of varying size.Average tree growth was fast,but variability was high,suggesting considerable potential for the improvement of this economically important species.The trees responded to increased levels of fertilizer and lime with significantly increased foliar nutrient contents and growth,probably because of the improved availability of Mg and Ca for which the species seems to have a relatively high demand.In contrast to Brazil nut trees grown in forest or dense plantations,the agroforestry trees invested a substantial part of their biomass and nutrients in large branches and developed spreading crowns.To improve stem form,reduce competition with associated crops for light and recycle nutrients,regular pruning of lower branches or planting arrangements that favor self-pruning are recommended.These measures would also increase the recycling of Ca and Mg,large quantities of which are contained in the branches.  相似文献   

Why cuckoos should parasitize parrotbills by laying eggs randomly rather than laying eggs matching the egg appearance of parrotbill hosts?     

Canchao Yang  Fugo Takasu  Wei Liang  Anders P M?ller 《中国鸟类》2015,(2):53-59

The coevolutionary interaction between cuckoos and their hosts has been studied for a long time, but to date some puzzles still remain unsolved. Whether cuckoos parasitize their hosts by laying eggs randomly or matching the egg morphs of their hosts is one of the mysteries of the cuckoo problem. Scientists tend to believe that cuckoos lay eggs matching the appearance of host eggs due to selection caused by the ability of the hosts to recognize their own eggs.In this paper, we first review previous empirical studies to test this mystery and found no studies have provided direct evidence of cuckoos choosing to parasitize host nests where egg color and pattern match. We then present examples of unmatched cuckoo eggs in host nests and key life history traits of cuckoos, e.g. secretive behavior and rapid egg-laying and link them to cuckoo egg laying behavior. Finally we develop a conceptual model to demonstrate the egg laying behaviour of cuckoos and propose an empirical test that can provide direct evidence of the egg-laying properties of female cuckoos. We speculate that the degree of egg matching between cuckoo eggs and those of the host as detected by humans is caused by the ability of the hosts to recognize their own eggs, rather than the selection of matching host eggs by cuckoos. The case of Common Cuckoos(Cuculus canorus) and their parrotbill hosts(Paradoxornis alphonsianus), where it has been shown that both have evolved polymorphic eggs(mainly blue and white), was used to develop a conceptual model to demonstrate why cuckoos should utilize parrotbill hosts by laying eggs randomly rather than laying eggs matching the appearance of host eggs.In conclusion, we found no evidence for the hypothesis that cuckoos lay eggs based on own egg color matching that of the parrotbill-cuckoo system. We argue theoretically that laying eggs matching those of the hosts in this system violates a key trait of the life history of cuckoos and therefore should be maladaptive.  相似文献   

Changes in various metabolic parameters in blood and milk during experimental Escherichia coli mastitis for primiparous Holstein dairy cows during early lactation     

Kasey M Moyes  Torben Larsen  Peter S?rensen  Klaus L Ingvartsen 《畜牧与生物技术杂志(英文版)》2015,(1):37-46

Background:The objective of this study was to characterize the changes in various metabolic parameters in blood and milk during IMI challenge with Escherichia coli(E.coli) for dairy cows during early lactation.Thirty,healthy primiparous Holstein cows were infused(h = 0) with-20-40 cfu of live ? coli into one front mammary quarter at ~4-6wk in lactation.Daily feed intake and milk yield were recorded.At-12,0,3,6,12,18,24,36,48,60,72,96,108,120,132,144,156,168,180 and 192 h relative to challenge rectal temperatures were recorded and quarter foremilk was collected for analysis of shedding of E.coli.Composite milk samples were collected at-180,-132,-84,-36,-12,12,24,36,48,60,72,84,96,132 and 180 h relative to challenge(h = 0) and analyzed for lactate dehydrogenase(LDH),somatic cell count,fat,protein,lactose,citrate,beta-hydroxybutyrate(BHBA),free glucose(fglu),and glucose-6-phosphate(G6P).Blood was collected at-12,0,3,6,12,18,24,36,60,72,84,132 and 180 h relative to challenge and analyzed for plasma non-esterified fatty acids(NEFA),BHBA and glucose concentration.A generalized linear mixed model was used to determine the effect of IMI challenge on metabolic responses of cows during early lactation.Results:By 12 h,E.coli was recovered from challenged quarters and shedding continued through 72 h.Rectal temperature peaked by 12 h post-challenge and returned to pre-challenge values by 36 h post-IMI challenge.Daily feed intake and milk yield decreased(P 0.05) by 1 and 2 d,respectively,after mastitis challenge.Plasma BHBA decreased(12 h;P 0.05) from 0.96 ± 1.1 at 0 h to 0.57 ±0.64 mmol/L by 18 h whereas concentration of plasma NEFA(18 h) and glucose(24 h) were significantly greater,11 and 27%,respectively,after challenge.In milk,fglu,lactose,citrate,fat and protein yield were lower whereas yield of BHBA and G6 P were higher after challenge when compared to pre-challenge values.Conclusions:Changes in metabolites in blood and milk were most likely associated with drops in feed intake and milk yield.However,the early rise in plasma NEFA may also signify enhanced adipose tissue lipolysis.Lower concentrations of plasma BHBA may be attributed to an increase transfer into milk after IMI.Decreases in both milk lactose yield and%after challenge may be partly attributed to reduced conversion of fglu to lactose.Rises in G6 P yield and concentration in milk after challenge(24 h) may signify increased conversion of fglu to G6 P.Results identify changes in various metabolic parameters in blood and milk after IMI challenge with E.coli in dairy cows that may partly explain the partitioning of nutrients and changes in milk components after IMI for cows during early lactation.  相似文献