共查询到20条相似文献，搜索用时 93 毫秒
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本试验对兵团第2师农业技术推广站提供的5种脱叶药剂进行了田间药效试验,以便掌握脱叶剂产品对棉花脱叶、催熟效果,筛选出最佳脱叶药剂,为今后棉花生产中大面积推广应用提供依据。一、材料与方法1.试验设计试验共设5个处理和1个清水对照。处理1:667米2喷施1ower7 500毫升+乙烯利80克。处理2:667米2喷施佰脱隆(噻苯隆80%)25克+乙烯利80克。处理3:667米2喷施脱佳(50%噻苯隆)40克+乙烯利80克。处理4:667米2喷施逸采(50%噻苯隆)40克+乙烯利80克。处理5:当地常规药剂667米2喷施脱 相似文献
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《山西农业科学》2017,(5):710-714
为了使成熟期绿豆适应机械化收获的要求,以晋绿豆8号为试验材料,研究了立收谷、草铵膦与乙烯利3种不同药剂及配比对成熟期绿豆的脱叶催熟效果。结果显示,脱叶催熟剂喷施6 d左右就可使绝大多数的叶片脱落或干枯,茎秆含水量也较对照降低10%以上,籽粒含水量可下降到采收的标准;混配的脱叶催熟剂以及单喷施乙烯利均有一定的催熟作用;脱叶催熟剂在喷施9 d时落荚率明显升高,且药剂用量越大落荚率越高;喷施脱叶催熟剂对绿豆百粒质量和单株产量的影响较小,但会导致不同程度的产量损失;将脱水效果和籽粒产量进行综合分析认为,在绿豆成熟后期采用脱叶催熟剂进行催熟时,首选立收谷1 500 m L/hm2+乙烯利4 500 m L/hm2(LSG1),该混配药剂具有脱叶、脱水和催熟效果明显,对产量影响较小的特点。 相似文献
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为探讨新型脱叶催熟剂欣噻利在鄱阳湖植棉区中早熟棉花(Gossypium spp)品种上的应用效果,以赣棉杂1号为试材进行田间试验。结果表明,脱叶催熟处理均有较好的脱叶效果,在喷施15 d后,脱叶率均可达到95.0%以上,在喷施25 d时,基本可达到100.0%;催熟效果以噻苯隆750 g+乙烯利2 700 mL/hm2处理最好,2 700 mL/hm2欣噻利处理次之;脱叶催熟处理可以显著提高霜前子棉产量,其中以噻苯隆750 g+乙烯利2 700 mL/hm2处理最高,2 700 mL/hm2欣噻利处理次之;各脱叶催熟处理对单铃重、单铃壳重、衣分以及纤维品质没有显著影响,对喷施时铃期在50 d以上的棉铃种子的萌发也没有影响。在鄱阳湖植棉区同等气候和地域条件下,采用与早熟品种相同的施用技术作用于中早熟品种上,1 800～2 700 mL/hm2欣噻利脱叶催熟效果比较理想。 相似文献
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WILLIAMS TI 《Science (New York, N.Y.)》1960,132(3436):1296-1297
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Segregation of form, color, movement, and depth: anatomy, physiology, and perception 总被引：63，自引：0，他引：63
Anatomical and physiological observations in monkeys indicate that the primate visual system consists of several separate and independent subdivisions that analyze different aspects of the same retinal image: cells in cortical visual areas 1 and 2 and higher visual areas are segregated into three interdigitating subdivisions that differ in their selectivity for color, stereopsis, movement, and orientation. The pathways selective for form and color seem to be derived mainly from the parvocellular geniculate subdivisions, the depth- and movement-selective components from the magnocellular. At lower levels, in the retina and in the geniculate, cells in these two subdivisions differ in their color selectivity, contrast sensitivity, temporal properties, and spatial resolution. These major differences in the properties of cells at lower levels in each of the subdivisions led to the prediction that different visual functions, such as color, depth, movement, and form perception, should exhibit corresponding differences. Human perceptual experiments are remarkably consistent with these predictions. Moreover, perceptual experiments can be designed to ask which subdivisions of the system are responsible for particular visual abilities, such as figure/ground discrimination or perception of depth from perspective or relative movement--functions that might be difficult to deduce from single-cell response properties. 相似文献
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ICP-OES法同时测定果蔬中铅、砷、镉、铬、铜、锡含量 总被引：2，自引：0，他引：2
果蔬样品经混酸消化后,控制一定的酸度,定容后应用等离子体发射光谱法(ICP-OES)对果蔬中铅、砷、镉、铬、铜、锡六种有害重金属进行测定,研究了分析测定条件,方法简单快速。测定结果表明,五种元素的加标平均回收率在91.0%~107%之间。其RSD均小于3.5%。按该方法进行处理及测定铅、砷、镉、铬、铜、锡,在选择的测定条件下最低检出限分别为0.0006 mg/kg、0.0003 mg/kg、0.00003 mg/kg、0.00005 mg/kg、0.00003 mg/kg、0.0006 mg/kg。 相似文献
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本试验以菜豆品种先行者为试材,采用32孔、50孔两种规格穴盘,设置10、15、20、25 d等4个苗龄段,通过研究不同穴盘规格和苗龄对菜豆性状及产量的影响,筛选出适合菜豆育苗的穴盘规格和适宜的苗龄。结果表明：穴盘育苗的营养面积增大,菜豆产量随之增加,25 d苗龄条件下,32孔穴盘的前期产量和总产量均显著高于50孔穴盘;随着苗龄的增长,菜豆的前期产量和总产量呈增加趋势,其中25 d苗龄的产量显著高于其他苗龄。综合上述各项指标,菜豆育苗阶段,10 d苗龄可选用32孔、50孔穴盘,15 d以上秧苗选用32孔穴盘为宜。 相似文献
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通过野外调查、标本采集、分类学研究及资料考证,基本摸清了贵州樟科、莲叶桐科、景天科、堇菜科、柳叶菜科、鹿蹄草科、柿科、山矾科、木犀科等9个科药用植物资源的种类与地理分布.结果发现贵州现有樟科药用植物49种4变种,莲叶桐科药用植物5种,景天科药用植物21种,堇菜科药用植物19种1变种,柳叶菜科药用植物20种4变种,鹿蹄草科药用植物7种1变种,柿科药用植物9种1变种,山矾科药用植物12种,木犀科药用植物30种3变种.其中,4种为贵州特有药用植物,40种5变种为贵州药用新资源. 相似文献
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The finding of appreciable quantities of p,p'-DDT after feeding o,p'-DDT to rats led to the proposal of a theory, that an isomeric metabolic conversion occurs. The presence of p,p'-DDT as an impurity in supposedly pure samples of o,p'-DDT is the correct explanation for the appearance of p,p'-DDT. Purified o,p'-DDT and (14)C-labeled o,p'-DDT yielded no data to support the idea that o,p'-DDT is converted to the p,p'-DDT isomer. 相似文献
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The primary rocks are a sequence of titanium-rich basic volcanics, composed of clinopyroxene, plagioclase, and ilmenite with minor olivine, troilite, and native iron. The soil and microbreccias are respectively loose and compacted mixtures of fragments and aggregates of similar rocks, minerals, and glassy fragments and spheres. Impact events are reflected by the presence of shock metamorphosed rock fragments, breccias, and glasses and their resulting compaction to form complex breccias, glass-spattered surfaces, and numerous glass-lined craters. Chemistry of the glasses formed by the impact events is highly variable, and the high iron and nickel content of a few moundlike features suggests that at least some of the projectiles are iron and nickel-rich meteorites. 相似文献
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重金属稀土元素污染在水生物体内的生物富集 总被引：2，自引：0，他引：2
对铅、镉、汞以及镧、铈在鲤鱼体内的生物富集作用进行了室内试验和讨论。结果表明,重金属及稀土元素在鱼体各部位均有较强的富集作用,其中肌肉部分富集能力较弱,内脏富集能力最强;鱼体各部位对重金属及稀土元素的富集作用随时间的增加而增加,在一定的时间后趋于平衡;并且,鱼体中各部位对重金属及稀土元素的生物富集作用存在较大差异。 相似文献