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石榴有甜酸之分 ,甜者如蜜 ,酸者酸中带甜 ,生津止渴 ,深受人们喜好。如何区分甜石榴和酸石榴呢 ?一般甜石榴果嘴合拢 ,皮色粗糙 ,叶片短宽 ,树枝脆而易断。酸石榴果嘴多张开 ,果形规整 ,皮色光亮 ,叶片狭长 ,树枝韧而不易折断。石榴适应性广 ,在干旱与半干旱地区 ,冬季不低于 - 2 0℃都能栽种。对土壤要求不高 ,若土壤过肥 ,反而花多果少 ,枝条徒长 ;土质过差 ,又会使果实品质不佳。石榴繁殖简易 ,主要以扦插、压条和分株为主。春季发芽前 ,选择一年生健壮枝条 ,剪成 30~4 0cm ,斜插在疏松的土壤中 ,上留 2~ 4个芽眼 ,适时浇水 ,保持土… 相似文献
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为抢战早期果品市场 ,取得更好的经济效益 ,北京市顺义区南彩镇于 2 0 0 2年春 ,与北京市农科院植保所合作 ,引进定植了 2 6hm2 (40亩 )早熟超红珠、丽春、春光等优新甜油桃树。今年 3月中下旬 ,这批果树就已经鲜花满枝。据悉 ,这批定植的早熟油桃采用了熊蜂、蜜蜂混合授粉 ,人工辅助授粉等技术。所以 ,鲜油桃在“5·1”节前即可上市。早熟甜油桃提前上市熊蜂、蜜蜂立首功@李黎
@赵国英 相似文献
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目前.云南省新平县甜油桃开始陆续上市,今年全县甜油桃总产量预计将超过500t。
新平县科技局引种“艳光”、“曙光”、“瑞光五号”、“瑞光二号”等甜油桃品种试种成功后,全县甜油桃发展迅猛。截至目前,全县以“艳光”为主的甜油桃面积达233.33hm^2。新平县的“艳光”甜油桃成熟早、果形大,产量高,在当地单果重最高可达200g多,每667m^2产量3t左右,果实鲜红、光滑、香甜、品质优,颇受欢迎。 相似文献
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《饲料工业》2019,(18):54-58
应用电感耦合等离子-质谱技术(ICP-MS),建立饲料中钠、镁、铬、锰、铁、铜、锌、砷、硒、镉和铅等元素的测定方法。对饲料样品的前处理方法、仪器工作参数和11种元素标准曲线进行优化;并以加标回收、分析方法比对和重复测试说明方法的准确性和精密性。方法在0~1 000 ng/ml范围内线性良好,仪器检出限为0.557 7~5.072 ng/ml,具有良好的精密度,其回收率在88.1%~104.4%之间,相对标准偏差小于5.0%。同时与原子吸收和原子荧光方法进行比对,测定结果相近。所建立的方法简单、快速,可替代原子吸收和原子荧光方法测定饲料中的11种金属元素,为饲料的质量控制提供理想的元素分析方法。 相似文献
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In experiment 1, 6 pregnant mares received a concentrate that contained a trace mineral premix that provided 14.3 mg Cu, 40 mg Zn, 28 mg Fe, 28 mg Mn, 0.08 mg Co, 0.16 mg I, and 0.16 mg Se/kg concentrate (group A). Seven mares received the same concentrate plus 502 mg Zn and 127 mg Cu once daily (group B). No differences (P > .05) in foal growth data, or Cu, Zn, and Fe concentrations of mare milk, mare serum, or foal serum were observed. In experiment 2, 6 pregnant mares received the same concentrate as group A (group C), and 8 mares received the same concentrate fortified with 4× the trace mineral premix (group D). Group C mares had higher serum Zn concentration at 1 day (P < 0.01) and 56 days (P < 0.04). Group C mares had higher milk Fe concentration at 28 days (P < .01), and group D mares had higher milk Cu concentration at 56 days (P < .01). Group C foals had higher serum Cu concentration at 14 days (P < .03). The results from this study provide no evidence to indicate that supplementing late gestating and lactating mares with higher dietary trace mineral levels than those recommended currently by NRC has any influence on foal growth and development, or on the Cu, Zn, and Fe concentrations of the mare milk, mare serum, or foal serum. 相似文献
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Breed differences for weight (CW), height (CH), and condition score (CS) were estimated from records (n = 12,188) of 2- to 6-yr-old cows (n = 744) from Cycle IV of the U.S. Meat Animal Research Center's Germplasm Evaluation (GPE) Program. Cows were produced from mating Angus and Hereford dams to Angus, Hereford, Charolais, Shorthorn, Galloway, Longhorn, Nellore, Piedmontese, and Salers sires. Samples of Angus and Hereford sires were 1) reference sires born from 1962 through 1970 and 2) 1980s sires born in 1980 through 1987. The mixed model included cow age, season of measurement and their interactions, year of birth, pregnancy-lactation code (PL), and breedgroup as fixed effects for CW and CS. Analyses of weight adjusted for condition score included CS as a linear covariate. The model for CH excluded PL. Random effects were additive genetic and permanent environmental effects associated with the cow. Differences among breed groups were significant (P < 0.05) for all traits and were maintained through maturity with few interchanges in ranking. The order of F1 cows for weight was as follows: Charolais (506 to 635 kg for different ages), Shorthorn and Salers, reciprocal Hereford-Angus (HA) with 1980s sires, Nellore, HA with reference sires, Galloway, Piedmontese, and Longhorn (412 to 525 kg for different ages). Order for height was as follows: Nellore (136 to 140 cm), Charolais, Shorthorn, Salers, HA with 1980s sires, Piedmontese, Longhorn, Galloway and HA with reference sires (126 to 128 cm). Hereford and Angus cows with reference sires were generally lighter than those with 1980s sires. In general, breed differences for height followed those for weight except that F1 Nellore cows were tallest, which may in part be due to Bos taurus-Bos indicus heterosis for size. 相似文献
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液相色谱-串联质谱法测定动物尿液中11种β-受体激动剂残留量的不确定度评估 总被引:1,自引:1,他引:0
采用液相色谱-串联质谱法测定动物尿液中11种β-受体激动剂残留量,对标准溶液、体积、质谱峰面积、浓缩过程及回收率等测定不确定度因素进行了分析,通过评定各不确定度分量及标准不确定度,得出11种β-受体激动剂的扩展不确定度在0.7 ~ 1.1 ng/mL范围内.由各因素对合成不确定度的贡献比分析可知,影响较大的因素为试验回收率及标准溶液浓度. 相似文献
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K Reifenberg M Stahl U L?sch 《Zentralblatt für Veterin?rmedizin. Reihe B. Journal of veterinary medicine. Series B》1989,36(3):191-198
A simple two step procedure for the isolation of caprine, ovine, bovine, equine, canine, porcine and human peripheral blood granulocytes is described. After enrichment of granulocytes by centrifugation, contaminating erythrocytes are lysed hypotonically. Recovery, purity, and viability of the granulocyte suspensions are determined. FACScan analysis of the cell suspensions measuring cellular size by forward and sideward light scatter is compared with the corresponding analysis of whole blood leukocytes. Constituencies of the isolated cell suspensions and loss of granulocyte subpopulations through isolation procedure is discussed with regard to granulocyte function assays. 相似文献