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益母草种子质量分级标准研究 总被引:1,自引:0,他引:1
目的:制定益母草种子质量分级标准.方法:测定不同来源的30份益母草种子发芽率、千粒重、水分和净度等指标,应用SPSS16.0软件,对上述指标数据进行标准化变换后,应用K类中心聚类分析,制定分级标准.结果:益母草种子质量分为3个等级,一级益母草种子发芽率≥84%,千粒重≥1.15 g,水分≤6.8%,净度≥97%;二级益母草种子发芽率≥8%,千粒重≥0.95 g,水分≤8.3%,净度≥90%;三级益母草种子发芽率≥35%,千粒重≥0.78 g,水分≤8.8%,净度≥82%.结论:此方法制定的质量分级标准科学、可行,可作为益母草种子的质量控制标准. 相似文献
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种子质量的内容包括品种品质和播种品质两个方面。品种品质包括纯度、丰产性、抗逆性、生育期等特征特性;播种品质主要包括净度、活力、水分、病虫害、千粒重等。我国国标主要采用纯度、净度、发芽率、水分四大指标衡量种子质量,并以纯度、净度、发芽率作为种子分级之依... 相似文献
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通过单株选择、成对杂交、隔离区(网)株系圃选择产生U 33A原原种,再隔离繁殖产生原种,原种隔离繁殖产生不育系大田用种;通过单株选择套袋自交、隔离区株系选择产生恢复系X 6-1原原种,再繁殖产生原种;杂交种生产可利用自然的森林、河道、道路、房屋等进行隔离,开阔地带隔离距离800m以上,同时父本早播,使父本充分利用冬前的光温资源进行营养生长,形成强壮的父本植株,能提供更多的花粉,父本在9月5—10日播种,母本9月12—16日播种。繁殖和制种中按照国家相关标准进行质量检验,亲本原种种子质量标准为:纯度≥99%,净度≥98%,发芽率≥90%,水分≤9%,硫甙含量≤20μmol/g(饼),芥酸含量≤0.5%;亲本大田用种质量标准为:纯度≥98%,净度≥98%,发芽率≥90%,水分≤9%;杂交种质量标准为:纯度≥90%,净度≥98%,发芽率≥85%,水分≤8%。 相似文献
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为建立商洛黄芩种子质量标准,通过测定商洛市商州区、洛南县、丹凤县、山阳县、柞水县等5个地区黄芩种子净度、千粒重、含水量、发芽率、生活力等指标,并分析商洛市不同地区黄芩种子品质优劣.结果表明,商洛黄芩种子净度为88%~90%,千粒重为1.4863~1.5286 g,饱满率为85%~89%,含水量为7.05%~7.82%,发芽势为60.67%~44.67%,发芽率为67.66% ~79.34%,生活力为94%~98%.以发芽率、千粒重、含水量、净度作为分级参考指标,将种子分成3个等级.通过分析得出:质量好的黄芩种子净度、饱满率、千粒重、发芽率等指标均较高,种皮颜色较纯黑,无杂质且较均匀.本研究发现,黄芩种子千粒重较高的种子,其发芽率、发芽势及生活力也较高;反之,种子千粒重低,其种子发芽率、发芽势及生活力也较低. 相似文献
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益母草种子适宜采收期的初步研究 总被引:1,自引:0,他引:1
目的:制定益母草种子质量的分级标准,确定益母草种子的适宜采收时间.方法:先分别测定34份不同产地的益母草种子的千粒重、水分、净度、发芽率、发芽势、发芽指数和出苗率,并采用SPSS 19.0软件对数据进行K聚类分析,制定益母草种子的质量分级标准;并对9份不同采收时间的益母草种子的上述指标进行测定,利用制定的分级标准进行评价,确定益母草种子最适宜采收时间.结果:将益母草种子分为4个等级.其中一级种子发芽率不低于87%,发芽势不低于83%,发芽指数不低于24.89,千粒重不低于1.035 5 g,净度不低于95.4%,含水量不超过8.21%;二级种子发芽率不低于77%,发芽势不低于56%,发芽指数不低于20.48,千粒重不低于0.878 3 g,净度不低于94.0%,含水量不超过8.24%.9份不同采收时期的益母草种子中,CS-3为一级种子,CS-6、CS-7为二级种子,CS-1、CS-5、CS-8为三级种子,CS-2、CS-4、CS-9为四级种子,因此确定了益母草种子的最适宜采收时间为8月上旬.结论:制定了益母草种子质量分级标准,为益母草种子的质量控制提供了参考,并采用此分级标准确定了益母草种子最适宜的采收时间,为益母草种子的适时采收提供了依据. 相似文献
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质量是指产品或服务满足规定或潜在需要的特征和特性的总和 (ISO 84 0 2 )。通常意义的种子质量包括播种质量 (净度、发芽率、水分、千粒重、活力、病虫感染率等 )和品种质量 (品种的真实性和纯度 ) ,而种子软质量指种子内在的价值取向、外部的包装品质及完善的种子标签 (包括品种名称、特征特性及栽培技术、适用范围、生产年月、纯度、净度、水分、发芽率等 )。1 种子软质量的主要特点1.1 效益性。效益是农作物生产的出发点和归宿。人们使用种子的目的并不在当代种子本身 ,而是其后代的营养体或果实。种子软质量更重视种子后代的价值 ,… 相似文献
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Diploid, tetraploid, and hexaploid plants occurred in foreign plant introductions of P. sp. affin. P. montanum from Turkey and Iran. Within-progeny variations in polyploid levels indicate that divergent races occurred as interspersed but natural populations. One to six B-chromosomes of varying sizes in addition to the normal chromosome complement were present in some plants. Their behaviours appeared essentially similar to those recorded for other species. Certain of the plants examined exhibited cytological features similar to those observed in known hybrids. These included prophase pycnosis, stickiness, split metaphase I plates, unoriented chromosomes at M-1, and low levels of pollen stainability. These features were absent in microsporocytes of other plants. Low open-pollination seed set characterized all plants examined. This may be due to hybridity or possibly to response to ecological conditions of the new environment.Results of co-operative work of the Crops Research Division, A.R.S., U.S. Department of Agriculture, and the Wisconsin Agricultural Experiment Station, Madison, Wisconsin.Former Graduate Student, Department of Agronomy, Wisconsin Agricultural Experiment Station, and Geneticist, Crops Research Division, Agricultural Research Service, U.S. Department of Agriculture. 相似文献
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A widely-held belief is that stricter environmental regulations stifle economic growth. To determine empirically the effect of environmental conditions and policies on state-level per capita income growth, a Barro-type economic growth model was estimated for the years 1982 to 1991, which correspond to two consecutive troughs in the business cycle. States with better environmental conditions had significantly higher income growth rates during this period. At the same time, stricter environmental policies did not significantly depress income growth. Data used include recently developed, consistent measures of environmental policy and quality for individual states, as well as data from the 1980 U.S. Census and Bureau of Economic Analysis. 相似文献