共查询到20条相似文献,搜索用时 15 毫秒
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Adler I Trombka J Gerard J Lowman P Schmadebeck R Blodget H Eller E Yin L Lamothe R Osswald G Gorenstein P Bjorkholm P Gursky H Harris B 《Science (New York, N.Y.)》1972,177(4045):256-259
The lunar surface was mapped with respect to magnesium, aluminum, and silicon as aluminum/ silicon and magnesium/ silicon intensity ratios along the projected ground tracks swept out by the orbiting Apollo 16 spacecraft. The results confirm the observations made during the Apollo 15 flight and provide new data for a number of features not covered before. The data are consistent with the idea that the moon has a widespread differentiated crust (the highlands). The aluminum/ silicon and magnesium/ silicon concentration ratios correspond to those for anorthositic gabbros through gabbroic anorthosites or feldspathic basalts. The x-ray results suggest the occurrence of this premare crust or material similar to it at the Descartes landing site. 相似文献
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Iron, calcium, aluminum, silicon, and sulfur are major elements in the first surface sample of Mars that has been analyzed by the Viking x-ray fluorescence spectrometer. Titanium is present in minor quantities. This is consistent with the sample being a mixture of fine silicate and oxide mineral grains, with a significant proportion of sulfates, possibly hydrated. Ferric oxide is regarded as the red pigmenting agent on the martian surface, but if it coats silicate grains, the coatings must be very thin (= 2 micrometers) or discontinuous. A high abundance of Fe, relatively low abundances of Al, Rb, Sr, and Zr, and a high Ca/K ratio are distinctive features of the spectra. Preliminary determinations indicate the following abundances (as percentages by weight): Fe, 14 +/- 2; Ti < 1; S, 2 to 5; the Ca/K ratio by weight is greater than 5. 相似文献
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不同施肥方法对玉米产量的影响 总被引:3,自引:0,他引:3
李艳舫 《辽宁农业职业技术学院学报》2009,11(3):24-25
试验就不同施肥方法对玉米产量的影响进行了研究,结果表明玉米在施用底肥基础上再进行二次追肥的产量和效益最高,明显好于一次性施肥和不施磷肥。 相似文献
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芭蕉芋品种比较试验初报 总被引:1,自引:0,他引:1
对6个芭蕉芋(Canna edulis Ker)品种(3个红花材料、3个黄花材料)采用行播与窝播的品种间比较试验与花色间对比及生长情况观察,结果表明,在7、8、9月芭蕉芋生长较快,是芭蕉芋营养生长的主要阶段,10月中下旬芭蕉芋逐渐开花,进入生殖生长阶段;从品种间的平均产量看,兴义市长坡岭的黄花品种产量最高,达到96281.3kg/hm2,比兴义市长坡岭的红花品种增产19781.3kg/hm2,增产幅度达25.9%;从各个红花品种与黄花品种平均产量的对比来看,黄花品种的平均产量为89104.2kg/hm2,红花品种的平均产量为80229.2kg/hm2,黄花品种比红花品种增产11.1%。因此,在芭蕉芋的种植中,应积极推广黄花品种,以达到增产增收的目的。 相似文献
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波尔山羊杂交改良试验初报 总被引:3,自引:0,他引:3
为了改善金寨县本地山羊的产肉性能 ,引进了波尔山羊冷冻精液开展杂交改良试验 ,结果表明 :用波尔山羊冷冻精液配种 ,繁殖率与本地羊接近 ,并且杂交一代的初生体尺和生长速度明显优于本地山羊。试验表明 ,杂交一代不仅能保持本地羊的优点 ,同时还弥补了母本体躯不丰满、增重速度慢的缺点。说明利用波尔山羊作父本改良本地山羊效果显著 ,杂交组合理想 ,可作为金寨县山羊改良的利用品种 相似文献
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马铃薯新品种对比试验初报 总被引:13,自引:0,他引:13
2008年冬至2009年春进行了马铃薯新品种对比试验,并开展了影响马铃薯产量因素的调查。结果表明:中薯3号和紫花851的综合表现较好,可大面积推广应用;福克76、福克212表现一般,建议进一步试种观察。 相似文献
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马铃薯品种比较试验初报 总被引:3,自引:0,他引:3
经过连续 2年的品种比较试验 ,对引进马铃薯品种的早熟性、抗逆性及丰产性等农艺性状进行鉴定 ,以期筛选出适合安徽省淮北平原地区早熟栽培的马铃薯新品种 相似文献
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11个苜蓿品种的适应性比较试验初报 总被引:1,自引:0,他引:1
1997-1998年试验结果表明;在豫西地区苜蓿一年可刈割4茬。从产草量,再生速度,茎叶比,越冬性,越夏性,抗病虫性等多个方面综合比较,表现较好的国外苜蓿品种为卡夫101,安斯塔苜蓉,秘鲁苜蓿和埃及1643,国内苜蓿品种为晋南苜蓿和保定苜蓿。 相似文献