共查询到20条相似文献，搜索用时 30 毫秒
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(杨仁仙 《中国农业文摘-农业工程》2018,30(6):38-39
对在冷浸田上增施磷、钾肥及中微肥硅、硼试验,结果表明:在冷浸田中增施磷、钾可以促进水稻株高生长;增施中微肥硅、硼元素肥料可以促进水稻增产;增施微肥硅、硼可以增加水稻穗粒数和穗长;增施微肥硅(Si)可以促进水稻灌浆饱满,增加千粒重;效益分析表明在冷浸增施微肥硅、硼可以达到增产增收的目的。 相似文献
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通过开展水稻全程机械化不同施肥量对比试验,结果表明,增施钾肥处理的稻秆粗壮、产量高,因此在本地习惯施肥的基础上,适当增施钾肥更有利于增产增收。 相似文献
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<正> 磷与钾是农作物抗病的“良药”。合理施用磷肥与钾肥,不仅可以防治生理性病害,而且能够防治传染性病害。实践证明,水稻的纹枯病、稻瘟病、胡麻叶斑病、细菌性叶枯病,小麦的粉霉病、锈病,棉花的轮纹病、枯萎病,玉米的茎腐病、大小叶斑病等,都能由于增施磷、钾肥而减轻。如小麦播种前,每亩用过磷酸钙25～40公斤,氯化钾5～10公斤,或草木灰50～100公斤做底肥;或在小麦生长发育的中后期,即在锈病病菌大量发生前,用2％～3％过磷酸钙加1％氯化钾或加10％草木灰制成混合液,进行根外追肥,每亩喷洒混合液50～75公斤,对叶锈病、条锈病和秆锈病 相似文献
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通过开展秸秆还田与减量施肥试验,结果表明,秸秆还田能不同程度改善土壤的理化性状,特别是土壤孔隙度、速效钾;能提高肥料利用率,促进增产增收.秸秆还田施用腐熟剂与未施用腐熟剂相比,增产93.60 kg/hm2,增0.9个百分点,且肥料利用率均有不同程度的提高.秸秆还田减施15%钾肥减产393.30kg/hm2,减4.3个百分点;秸秆还田减施30%钾肥减产486.90kg/hm2,减5.1个百分点;但钾肥利用率有所提高.与无秸秆还田比,秸秆还田减施15%钾肥增产160.65kg/hm2,增1.8个百分点;秸秆还田减施30%钾肥增产67.05kg/hm2,增0.8个百分点;肥料利用率均有提高. 相似文献
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科学施磷钾肥可防果树病害 总被引：1，自引：0，他引：1
<正>研究发现,磷与钾是果树抗病的"良药",合理施用磷肥和钾肥,不仅可以防治果树的生理性病害,而且可以防治传染性病害。果树的多种病害都能由于增施磷钾肥而减轻。如每亩施25～40千克过磷酸钙、5千克氯化钾的果园,果树锈病的发病率能有所降低,且其防效不低于波尔多液。 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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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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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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WILLIAMS TI 《Science (New York, N.Y.)》1960,132(3436):1296-1297
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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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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
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Macklis RM 《Science (New York, N.Y.)》2002,295(5560):1647-1648
Although Marie Curie is known primarily for her discovery of radium, her true gift to science was her realization that radioactivity is an intrinsic atomic property of matter rather than the result of chemical processes. She was one of the few Nobel laureates to win the prize twice (physics and chemistry). During her career and as one of the first prominent women scientists, she became increasingly aware of the need for funding for research and of the scientific freedom that money can bring. By nature shy and reserved, Marie's fame, as both a scientist and as an exemplar of a liberated professional woman of the roaring twenties, grew to superstar proportions. 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