共查询到20条相似文献,搜索用时 62 毫秒
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应用最优回归设计研究葱头的高优施肥量 总被引:1,自引:0,他引:1
采用311-A拟饱和最优回归设计,对葱进行施用氮、磷、钾肥料试验。试验结果运用计算机DPS数据处理系统进行统计分析,模拟出葱的氮、磷、钾肥料施用量码值与产量及利润回归方程,获得葱头较高产量施肥量及较佳利润施肥量。 相似文献
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平凉川区胡麻配方施肥试验初报 总被引:1,自引:1,他引:0
对胡麻氮磷钾肥料效应进行验证性试验的结果表明,“3414”当地最大施肥量处理的折合产量最高,为682.1 kg/hm2,比对照增产92.1 kg/hm2,增产率达15.61%;其次是全国平均施肥量处理,折合产量为674.0 kg/hm2,比对照增产84.0 kg/hm2,增产率达14.24%。 相似文献
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通过对甘薯采用氮磷钾肥料平衡施肥3414试验方案进行田间试验,试验结果运用计算机DPS数据处理系统软件进行统计分析,模拟出甘薯氮磷钾肥料施用量码值与产量及利润的回归方程,运用边际分析方法,求得甘薯最高产量施肥量为氮肥168.4Kg/hm^2N,其N:P2O5:K20=1:0.26:1.45,甘薯最高产量为33555.5kg/hm^2;甘薯最佳利润施肥量为氮肥170.7kg/hm^2N,N:P2O5:K2O=1:0.21:1.26,其最佳利润为38509.4元/hmm^2本试验条件下,氮磷钾土壤供应量分别为39.45Kg/hm^2、20.29Kg/hm^2和61.99kg/hm^2,有效养分校正系数分别为19.65%、30.50%和239%,肥料利用率分别为24.35%、16.24%和49.04%。 相似文献
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马龙县水稻3414肥料效应试验研究 总被引:2,自引:0,他引:2
为探索马龙县水稻施肥模型,在中和村实施了3414肥料效应试验研究,建立了氮磷钾肥料效应回归方程,得出氮磷钾的最佳施肥量:N为94.7685kg/hm^2,P2O5为72.3825kg/hm^2,K2O为91.8285kg/hm^2,最佳产量7258.6152kg/hm^2;最佳的施肥量是籽粒实产与茎叶产量相等,以中等偏低的施肥量的肥料产量高。 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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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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Zhang M Fang S Zakhidov AA Lee SB Aliev AE Williams CD Atkinson KR Baughman RH 《Science (New York, N.Y.)》2005,309(5738):1215-1219
Individual carbon nanotubes are like minute bits of string, and many trillions of these invisible strings must be assembled to make useful macroscopic articles. We demonstrated such assembly at rates above 7 meters per minute by cooperatively rotating carbon nanotubes in vertically oriented nanotube arrays (forests) and made 5-centimeter-wide, meter-long transparent sheets. These self-supporting nanotube sheets are initially formed as a highly anisotropic electronically conducting aerogel that can be densified into strong sheets that are as thin as 50 nanometers. The measured gravimetric strength of orthogonally oriented sheet arrays exceeds that of sheets of high-strength steel. These nanotube sheets have been used in laboratory demonstrations for the microwave bonding of plastics and for making transparent, highly elastomeric electrodes; planar sources of polarized broad-band radiation; conducting appliqués; and flexible organic light-emitting diodes. 相似文献
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