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为探索硒肥对猕猴桃的增硒及增产效果,于2016年选用"康熙宝"富硒水溶肥在湘西自治州凤凰县"红心猕猴桃"品种上进行了叶面喷施试验。结果表明,喷施康熙宝富硒水溶肥(幼果期和壮果期2次喷施,每次用水溶肥100 m L对水100 kg/667m~2)的处理比对照(只喷等量清水和不喷硒肥及清水)平均增硒0.026 mg/kg,含糖量降低0.4~0.5个百分点,含酸量比对照下降0.03个百分点,糖酸比提高了0.8~1.0,可溶性固形物提高0.9%;平均增产6.8%~8.6%,增产效果达到极显著水平。经农业部检测,猕猴桃含硒量达到湖南省地方标准《富硒产品硒含量标准》。说明施用康熙宝富硒水溶肥对红心猕猴桃的增硒和增产效果显著,可大面积推广应用。 相似文献
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通过不同地点的同一田块水稻的同一生育时期选择3种不同类型硒肥进行叶面喷施处理,以清水处理作为对照(CK),考察不同类型硒肥对水稻富集硒的差异。结果表明,通过富硒微生物将亚硒酸钠转化而成的华龙西科生物有机硒肥(处理3、处理4)效果最好,稻米总硒和有机硒含量为0.3～0.5 mg/kg,达到DBS42/002-2014要求,不同地点、不同品种稳定性好且成本较低;处理1施用的是农希科牌硒肥,稻米总硒和有机硒含量不稳定,在0.15 mg/kg以下,或在0.5 mg/kg以上,达不到DBS42/002-2014要求;处理2施用的是硒之源牌硒肥,稻米总硒在0.15 mg/kg以下,且有机硒占比未达到80%,达不到DBS42/002-2014要求。 相似文献
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对韶山市镉、砷中度污染的稻田进行了土壤修复性试验,在杂交中稻稻田常规施肥基础上施用"稻粮香"牌复合降镉、降砷土壤调理剂(粉剂)300、250 kg/667m~2和不施土壤调理剂(CK)3个处理的情况下比较其效果。结果表明:土壤pH值比CK提高0.59～0.63;土壤中活性镉比CK下降0.131～0.142 mg/kg,降幅28.35%～30.74%,活性砷比CK下降0.105～0.112 mg/kg,降幅25.49%～27.18%;稻米中镉比CK下降0.152～0.167 mg/kg,降幅47.06%～51.70%,砷比CK下降0.078～0.083 mg/kg,降幅32.77%～34.87%。复合降镉、降砷效果达极显著水平(P 0.01),并达到《食品安全国家标准食品中污染物限量》GB2762-2017的规定。杂交中稻比CK平均增产38～42 kg/667m~2,增产率为6.29%～6.95%,增产效果达极显著水平(P 0.01)。土壤调理剂用量300 kg/667m~2比250 kg/667m~2的效果更好,因此,推荐用量为300 kg/667m~2。 相似文献
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[目的]探究几种新型肥料对水稻产量及稻米镉含量的影响。[方法]早、晚稻分别采用陆两优996和五优308,设置5种肥料处理,分别为生物酵素有机肥(F_1)、叶面肥(F_2)、果肥(F_3)和土壤改质肥(F_4)及不施肥处理(CK)。[结果]施用新型肥料能提高水稻的产量,与不施肥处理相比,早稻可增产34.97%~45.97%,晚稻可增产10.76%~37.62%。早、晚稻均以施用叶面肥的增产效果最好,分别为9 362.37、11 405.18 kg/hm~2。有机肥、叶面肥、果肥和土壤改质肥均能降低稻米中镉含量,早、晚稻分别以果肥、土壤改质肥的降镉效果最好,分别比不施肥少45.45%、35.71%,且稻米镉含量均为0.18 mg/kg。[结论]在保障产量和防治重金属污染的前提下,施用果肥既能提高水稻的产量,又能降低稻米中的镉含量,是一种高产、优质的新型肥料。 相似文献
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以富兰德里奶油生菜为试材,通过采后施加浓度为0(CK)、0.25、0.50、1.00 mg/L的4种不同农用硒肥,研究采后施用不同种类及浓度的农用硒肥对植物工厂水培生菜处理24 h后品质及硒含量的影响.结果表明,采后施用农用硒肥可以提高生菜的品质和硒含量.1.00 mg/L硒元素水溶调理剂处理,硒含量最高(97.38μg/kg),其次是0.50 mg/L螯合硒微量元素水溶肥处理(78.05μg/kg),二者显著高于其他处理;采后施用农用硒肥可提高生菜的根系活力、可溶性总糖、纤维素、淀粉含量,降低硝酸盐、丙二醛含量.对其品质指标进行主成分分析,综合品质最好的是0.50 mg/L螯合硒微量元素水溶肥处理,D值为0.94,其次是1.00 mg/L硒元素水溶调理剂处理(D值为0.77).兼顾叶片硒含量、施肥成本和品质,以0.50 mg/L螯合硒微量元素水溶肥最佳.0.50 mg/L螯合硒微量元素水溶肥采后处理24 h有利于水培生菜叶片富硒,且施肥成本较低,提高了水培生菜的品质及抗逆性.因此,0.50 mg/L螯合硒微量元素水溶肥处理为植物工厂水培生菜采后富硒的最佳农用硒肥及浓度. 相似文献
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为富硒水稻的生产提供科学依据，对水稻品种陵两优179和米两优89进行不同硒肥处理，观测不同硒肥处理对水稻农艺性状、产量及稻米中硒含量的影响。结果表明：在基肥中加施一定量的硒肥，对水稻有一定的增产作用，同时也显著增加了稻米中的硒含量。基肥中加施硒肥处理的陵两优179和米两优89有效穗数、千粒重、产量分别较只施基肥处理增加0.10万～0.19万穗/667m2和0.19万～0.62万穗/667m2、0.1～0.3 g和0.0～0.1 g、5.3～125.3 kg/667m2和97.3～108.3 kg/667m2，增产率分别为1.1%～26.0%和20.2%～22.5%。不同的硒肥处理对稻米的硒含量影响较大，能快速有效地提高稻米的硒含量。基肥中加施硒肥处理的陵两优179和米两优89水稻的稻米硒含量分别为0.04～0.16 mg/kg和0.03～0.15 mg/kg。在施用硒肥10 kg/667m2时，陵两优179和米两优89稻米的硒含量分别为0.16 mg/kg和0.15 mg/kg... 相似文献
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发展富硒茶叶生产可实现茶农增收。本文探索了茶农传统施肥与增施有机肥以及在不同施肥处理条件下叶面喷施硒有机水溶肥对茶叶硒富集能力的影响。结果表明,三江县成年茶树施肥模式建议在茶农传统施肥、配施有机肥6 000 kg/hm~2的基础上,施用硒有机水溶肥,可有效提高茶叶产量、效益及硒富集能力,值得进一步推广。 相似文献
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为了研究硒肥对水稻产量和大米中硒含量的影响，我们以常规水稻品种软香2号为试验材料，进行了叶面喷施“真打粮”富硒水溶肥的试验，在相同的大田栽培条件下，设置不同时间、不同用量和不同次数的叶面喷施试验。结果表明，叶面喷施“真打粮”富硒水溶肥对水稻有一定增产作用，适宜喷施时期是拔节孕穗至齐穗期，667 m2用量为200 mL(分2次喷施)效果更佳；喷施“真打粮”富硒水溶肥对水稻的增产作用主要表现在千粒重的提高；喷施“真打粮”富硒水溶肥可以显著提高稻米中的硒含量，并且随着用量的增加，稻米中硒的含量随之增加，而对照的硒含量则为未检测出。 相似文献
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不同富硒叶面肥对轻度镉污染稻田稻米降镉富硒效果的研究 总被引：2，自引：0，他引：2
《湖南农业科学》2015,(12)
评价了6种富硒叶面肥对轻度镉污染稻田不同水稻品种稻米中镉和硒积累的调控效果。结果表明,喷施6种不同富硒叶面肥处理比清水对照处理水稻产量均有增加,增产0.5%~14.0%;其中,以山东出品的麦稻宝叶面肥的增产效果最好,平均可增产13.55%;喷施不同种类的富硒叶面肥对稻米有一定的降镉富硒作用,试验田稻米的镉含量降低25.75%~64.38%,以一种湖南出品的富硒叶面肥效果最佳;稻米的硒含量增加3.40~21.54倍,以一种上海出品的有机富硒肥和上述湖南出品的富硒叶面肥效果最佳。 相似文献
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“康熙宝”富硒有机水溶肥料在白菜上的增产增硒效果初报 总被引：1，自引：0，他引：1
《新农业》2016,(23)
白菜采收前7~15天叶面喷施1~2次"康熙宝"富硒有机水溶肥料45毫升/667平方米,结果表明白菜增产13.82%~15.0%,硒含量增加0.016~0.24毫克/公斤之间,增产增硒作用明显。 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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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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Mansfield E 《Science (New York, N.Y.)》1980,209(4461):1091-1093
R & D, through its effects on the rate of productivity increase, can significantly restrain the rate of inflation in the medium and long run. High rates of inflation damage the workings of the price system and impair the efficiency of practically all economic activities, including R & D. Findings suggest that the percentage increase between 1969 and 1979, in total real R & D expenditures, has been exaggerated due to the inadequacy of the gross national product deflator as applied to R & D. 相似文献
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Fiber, food, fuel, and fungal symbionts 总被引：2，自引：0，他引：2
Virtually all plants of economic importance form mycorrhizae. These absorbing organs of higher plants result from a symbiotic union of beneficial soil fungi and feeder roots. In forestry, the manipulation of fungal symbionts ecologically adapted to the planting site can increase survival and growth of forest trees, particularly on adverse sites. Vesicular-arbuscular mycorrhizae, which occur not only on many trees but also on most cultivated crops, are undoubtedly more important to world food crops. Imperatives for mycorrhizal research in forestry and agriculture are (i) the development of mass inoculum of mycorrhizal fungi, (ii) the interdisciplinary coordination with soil management, plant breeding, cultivation practices, and pest control to ensure maximum survival and development of fungal symbionts in the soil, and (iii) the institution of nursery and field tests to determine the circumstances in which mycorrhizae benefit plant growth in forestry and agri-ecosystems. 相似文献
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The global distribution of fluorocarbon-12 and fluorocarbon-11 is used to establish a relatively fast interhemispheric exchange rate of 1 to 1.2 years. Atmospheric residence times of 65 to 70 years for fluorocarbon-12 and 40 to 45 years for fluorocarbon-l1 best fit the observational data. These residence times rule out the possibility of any significant missing sinks that may prevent these fluorocarbons from entering the stratosphere. Atmospheric measurements of methyl chloroform support an 8-to 10-year residence time and suggest global average hydroxyl radical (HO) concentrations of 3 x 10(5) to 4 x 10(5) molecules per cubic centimeter. These are a factor of 5 lower than predicted by models. Additionally, methyl chloroform global distribution supports Southern Hemispheric HO levels that are a factor of 1.5 or more larger than the Northern Hemispheric values. The long residence time and the rapid growth of methyl chloroform cause it to be a potentially significant depleter of stratospheric ozone. The oceanic sink for atmospheric carbon tetrachloride is about half as important as the stratospheric sink. A major source of methyl chloride (3 x 10(12)grams per year), sufficient to account for nearly all the atmospheric methyl chloride, has been identified in the ocean. 相似文献
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