共查询到20条相似文献，搜索用时 93 毫秒
1.
北京市怀柔农机厂生产的背负式弥雾喷粉及超低量喷雾机,可进行喷粉、喷撒尿素、液剂弥雾以及超低量喷雾多种作业,在茶园中经多年使用表明,具有高效、省工、节省成本的特点。喷撒尿素:喷撒的均匀性好,而且由于鼓风吹动茶蓬,使尿素掉落蓬内,不致灼伤蓬面芽叶。工效每亩只需5～7分钟,每机每工可喷撒90～95亩,作业成本(人工、燃料、机械折旧等)只需7.50元,较人工撒施工效高5倍。喷撒粉剂:此机装上长薄膜塑料管作喷撒粉剂治虫,可同时喷14行茶树,工效每亩只需2～4分钟,每机两人一天可喷120～240亩,在大面积病虫防治上更有实用意义。 相似文献
2.
本试验以小麦叶锈菌为供试菌，对１６种供试化合物进行了活体盆栽试验。试验结果表明，初筛选出的Ｈ—０４６与粉锈宁的生物活性相似，对于小麦叶锈病的防治效果与粉锈宁基本上一致。Ｈ—０４６的内吸持效期与粉锈宁也基本相似。 相似文献
3.
改进茶园农药喷撒技术的理论探讨 总被引：3，自引：0，他引：3
目前,茶叶生产通常采用传统的大容量喷雾法防治病虫害,这种喷药方法的特点是喷液量大,往往可高达125～200公斤/亩,因此,费工费药,农药的对靶率低,大部分农药散落于非目标靶区而污染环境。为了提高农药的对靶率,降低防治成本以及减轻农药对环境的污染,改进目前常用的农药喷撒技术已势在必行。早在40年代,国外就已经开始研究如何改进农药的喷撒技术,并提出了对靶喷撒农药的理论。近几十年来,根据这一对靶沉积理论,国外相继出现了静电喷撒法、间隙喷雾法、笼罩喷雾法和各种各样的低容量、超低容量喷雾法,这些方法的共同点是雾滴细而均匀,农药在目标靶上的沉积率高,防治效果好,成本低,所以,有很高的使用价值。我国的农药喷撒技 相似文献
4.
本试验以小麦叶锈菌为供试菌，对１６种供试化合物进行了活体盆栽试验，试验结果表明，初筛选出的Ｈ－０４６与粉锈宁的生活活性相似，对于小麦叶锈病的防治效果与粉锈宁基本上一致，Ｈ－０４６的内吸持效期与粉锈宁也基本相似。 相似文献
5.
采用二次正交回归组合设计的方法，研究粉锈宁在杂交水稻后期应用的防衰、防病 效果和最佳施用技术。经微机计算分析表明：施用粉锈宁防衰保叶和兼防叶尖干枯病、稻曲病的 最佳用药时间为始穗至齐穗期，每亩用药量为有效成分６．８～８．１克（相当于２０％粉锈宁粉剂３４～ ４１克），浓度为２７０～３３０ｐｐｍ。 相似文献
6.
陈坤荣 《中国油料作物学报》1988,(4)
分别用不同浓度的杀菌剂粉锈宁、氧化萎锈钠和代森锰溶液分3次喷洒防治大豆锈病的田间试验结果表明,三种杀菌剂对防治大豆锈病都有显著的效果.粉锈宁的防效最好,防治效果在90％以上,增产效果显著。 相似文献
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30%爱苗防治水稻稻曲病效果试验初报 总被引：1，自引：0，他引：1
30%爱苗EC不同剂量、次数防治水稻稻曲病与常用农药25%粉锈宁WP进行对比试验,结果表明:30%爱苗EC 20 ml/667m2、30%爱苗EC 15 ml/667m2和25%粉锈宁WP 140 g/667m2各喷2次,对稻曲病的防治效果较好,喷施30%爱苗EC具有保护上三片功能叶、延缓叶片衰老,提高结实率及增产作用。 相似文献
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10.
近年来，稻粒黑粉病严重危害交水稻制种和繁殖的产量和质量，成为急待解决的课题之一。据各地试验，在农业防治的基础上，于花期进行药剂防治常常是控制该病发生的必不可少的有效手段。目前生产上已大面积应用粉锈宁、多菌灵等药剂进行防治。１９９１年我们从浙江农业大学种子激素实验室引进专用防治药剂克黑净，同时安排粉锈宁、多菌灵、禾枯灵参试，以期对克黑净作出正确评价，为大面积应用药剂控制稻粒黑粉病提供科学依据。现将试验研究情况报道如下。１材料和方法１．１试验概况试验安排在小河镇尧田村果木山队汪晓林户进行。供试组合汕… 相似文献
11.
Joseph E. Laferriere Charles W. Weber Edwin A. Kohlhepp 《Plant foods for human nutrition (Dordrecht, Netherlands)》1991,41(3):277-282
Teas of plant origin traditionally consumed by the Mountain Pima of Chihuahua, Mexico, were analyzed for mineral nutritional content. Fe, Cu, Zn, Ca, and Mg composition was determined for native teas made from shoots ofTagetes lucida, T. filifolia, Elytraria imbricata, andHolodiscus dumosus, and from root xylem ofCeanothus depressus andPhaseolus ritensis. Native uses of these teas are also described. 相似文献
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Lakshman Lal 《Potato Research》1987,30(2):329-334
Summary The effects of the leaves of five plant species, one from each of the generaAmbrosia, Anemone, Eupatorium, Eucalyptus andLantana, on potato tuber moth were investigated under indigenous storage conditions at the Central Potato Research Station, Shillong
(1800 m above sea level). Their action was compared with that of a biological insecticide (spores ofBacillus thuringiensis), a chemical insecticide (carbaryl), and an untreated control. The data collected after six months storage on tuber damage,
sprout damage and the rotting indicated that the leaves ofLantana aculeata provided most protection to the tubers, reducing damage from over 70% in the check to below 5%, and sprout damage from over
45% to below 3%. Next best wasEucalyptus globulus followed byB. thuringiensis. They may be used on tubers stored for table use or for seed as they had no adverse effect on germination or on the yield
of a subsequent crop. 相似文献
14.
《Journal of Crop Improvement》2013,27(2):81-114
Summary The efficiency of N fertilizers is usually poor; often less than 50% of the applied N is taken up by the crop. This review focuses on various N fertilizers with respect to the significance of different N loss pathways, namely (i) ammonia volatilization, (ii) dinitrogen and nitrogen oxide emissions, and (iii) nitrate leaching. Further, the significance of biological N immobilization, ammonium fixation and, finally, the impact of nitrate vs. ammonium uptake on crop yield are also discussed. The reviewed literature shows that N fertilizers may differ markedly in their susceptibility to losses. There is, however, considerable scope to improve N efficiency of each N source by proper N management practices. 相似文献
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Tatiana G. Polotow Sandra C. Poppe Cristina V. Vardaris Douglas Ganini Maísa Guariroba Rita Mattei Elaine Hatanaka Maria F. Martins Eduardo F. Bondan Marcelo P. Barros 《Marine drugs》2015,13(10):6117-6137
Health authorities worldwide have consistently recommended the regular consumption of marine fishes and seafood to preserve memory, sustain cognitive functions, and prevent neurodegenerative processes in humans. Shrimp, crabs, lobster, and salmon are of particular interest in the human diet due to their substantial provision of omega-3 fatty acids (n-3/PUFAs) and the antioxidant carotenoid astaxanthin (ASTA). However, the optimal ratio between these nutraceuticals in natural sources is apparently the key factor for maximum protection against most neuro-motor disorders. Therefore, we aimed here to investigate the effects of a long-term supplementation with (n-3)/PUFAs-rich fish oil, ASTA-rich algal biomass, the combination of them, or krill oil (a natural combination of both nutrients) on baseline redox balance and neuro-inflammation indexes in cerebellum and motor cortex of Wistar rats. Significant changes in redox metabolism were only observed upon ASTA supplementation, which reinforce its antioxidant properties with a putative mitochondrial-centered action in rat brain. Krill oil imposed mild astrocyte activation in motor cortex of Wistar rats, although no redox or inflammatory index was concomitantly altered. In summary, there is no experimental evidence that krill oil, fish oil, oralgal biomass (minor variation), drastically change the baseline oxidative conditions or the neuro-inflammatory scenario in neuromotor-associated rat brain regions. 相似文献
17.
Youna Hemery Ulla Holopainen Anna-Maija Lampi Pekka Lehtinen Tanja Nurmi Vieno Piironen Minnamari Edelmann Xavier Rouau 《Journal of Cereal Science》2011
Wheat bran is a composite material made of several layers, such as pericarp, testa and aleurone. It could be fractionated into purified fractions, which might either be used as food ingredients, or serve as a starting material for extraction of bioactive compounds. The aim of this work was to evaluate the potential of using electrostatic separation as a way to obtain purified fractions from wheat bran. Ultrafine-ground bran obtained either by cryogenic grinding or by grinding at ambient temperature was used as starting material. The ultrafine bran was then charged by tribo-electrification and introduced in a chamber containing two high voltage electrodes, where bran particles were separated depending on their acquired charge, allowing positively and negatively charged fractions to be collected separately. The particle size distribution, microstructure and biochemical composition of the obtained fractions were studied. The charge of the particles was influenced by their biochemical composition: particles rich in highly branched and cross-linked arabinoxylans (pericarp) were separated from particles rich in β-glucan, ferulic acid and para-coumaric acid (aleurone cell walls). The testa and the intracellular compounds from aleurone were not highly charged, neither positively nor negatively. The most positively charged fraction represented 34% of the initial bran, and contained 62% of the ferulic acid present in the initial bran. The yield of the separation process was good (5.4% loss), and could be further increased. 相似文献
18.
Alexander N. Shikov Elena V. Flisyuk Ekaterina D. Obluchinskaya Olga N. Pozharitskaya 《Marine drugs》2020,18(11)
Marine organisms represent an excellent source of innovative compounds that have the potential for the development of new drugs. The pharmacokinetics of marine drugs has attracted increasing interest in recent decades due to its effective and potential contribution to the selection of rational dosage recommendations and the optimal use of the therapeutic arsenal. In general, pharmacokinetics studies how drugs change after administration via the processes of absorption, distribution, metabolism, and excretion (ADME). This review provides a summary of the pharmacokinetics studies of marine-derived active compounds, with a particular focus on their ADME. The pharmacokinetics of compounds derived from algae, crustaceans, sea cucumber, fungus, sea urchins, sponges, mollusks, tunicate, and bryozoan is discussed, and the pharmacokinetics data in human experiments are analyzed. In-depth characterization using pharmacokinetics is useful for obtaining information for understanding the molecular basis of pharmacological activity, for correct doses and treatment schemes selection, and for more effective drug application. Thus, an increase in pharmacokinetic research on marine-derived compounds is expected in the near future. 相似文献
19.
M. I. Siri P. Villanueva M. J. Pianzzola L. Franco Fraguas G. Galván M. Acosta F. Ferreira 《Potato Research》2004,47(3-4):127-138
Summary The in vitro antimicrobial activity of extracts from accessions ofSolanum commersonii Dun. collected in the south of Uruguay was investigated against five microorganisms including the pathogenRalstonia solanacearum. A total of 30 extracts corresponding to organic and aqueous extracts were studied. Interestingly, most of the positive results
for growth inhibition were againstR. solanacearum. The extracts were also analyzed for the presence of glycoalkaloids and lectins. Six of the ten aqueous extracts showed lectin
presence and a wide variation in the type and amounts of glycoalkaloids, was found. Results indicate that there is no clear
relationship between the antimicrobial activity against the five microorganisms screened and the presence or amounts of lectins
and glycoalkaloids, traditionally regarded as possible antimicrobial metabolites in theSolanum genus, which indicates the presence of as yet unidentified antimicrobial compounds. 相似文献
20.
Tovar LR Olivos M Gutierrez ME 《Plant foods for human nutrition (Dordrecht, Netherlands)》2008,63(4):189-194
Pulque is made by fermenting the agave sap or aguamiel of Agave atrovirens with a whole array of microorganisms present in the environment including several lactic acid bacteria and yeasts such as
Saccharomyces cerevisiae. Ascorbic acid was determined in pulque and aguamiel, respectively. Phytase activity in lees, liquid and freeze-dried pulque was assayed by measuring the appearance of phosphate from phytate by a colorimetric method likewise phosphate from phytate
present in fresh corn tortilla was measured after in vitro incubation with pulque. Iron, zinc, calcium, magnesium and selenium contents were measured in pulque and corn tortilla as well as in nixtamalized corn flour (NCF), the latter is used to make instant tortilla, since corn provides
most of the energy as well as most of the phytate in the Mexican rural diet. Pulque showed phytase activity but much less ascorbic acid and iron than previously reported; additionally, phytase in pulque hydrolyzed most of phytate’s corn tortilla. Lees, which is mostly made of pulque’s microbiota, significantly accumulated iron and zinc but no selenium. NCF was fortified with iron by the manufacturers but
poorly blended. There were significant differences on selenium content between tortillas samples, apparently some soils in
central Mexico are selenium deficient. Moderate pulque intake appears to increase the bioavailability of iron and zinc bound by phytate in corn. 相似文献