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针对旱作区胡麻生产中种肥无法满足全生育期养分需求,缺乏灌溉条件,无法进行追肥的问题,于2015～2016年,在宁夏彭阳县旱作雨养农业区以硫包衣尿素为供试肥料,开展田间试验,研究硫包衣尿素用量对旱地条件下胡麻的营养生长、干物质积累、经济性状和籽粒产量的影响,综合评价了硫包衣尿素不同用量的增产效果及氮肥利用效率。结果表明:硫包衣尿素能有效促进旱作区胡麻的营养器官生长,有助于干物质累积,显著提高了经济性状指标、籽粒产量及水肥利用效率,在干旱年份增幅尤为明显。随着硫包衣尿素用量的增加,胡麻植株的生长量、经济性状指标及籽粒产量也随之增加,两年间各项指标变化趋势基本一致。在187.5 kg/hm~2的施肥水平,其两年的植株高度、地上部鲜重、地上部干重、籽粒产量平均值均达到最大,分别达到55.98 cm、8.72 g、2.57 g、1 648.64 kg/hm~2,较对照增加13.55%、137.09%、115.07%、32.16%。 相似文献
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土壤蛋白酶和芳香氨基酶的研究进展 总被引：9，自引：0，他引：9
蛋白酶和芳香氨基酶是影响土壤有机氮矿化的两种重要酶,其在参与土壤有机质释放氨基酸的过程中起重要作用,控制着氮循环的关键步骤。本文对土壤中蛋白酶和芳香氨基酶的命名、分类、来源、分布、影响因素及测定方法进行了综合评述,以期为开展土壤蛋白酶和芳香氨基酶的相关研究提供理论参考。 相似文献
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Identification of Antigens Common to Streptococcus suis Serotypes 2 and 9 by ImmunoproteomicAnalysis 
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下载免费PDF全文 Streptococcus suis is a Gram-positive pathogen that causes serious diseases in pigs. In addition to S. suis serotype 2 (SS2), S. suis serotype 9 (SS9) is another prevalent serotype, which is frequently isolated from the organs of diseased pigs in China. An immunoproteomic-based approach was developed to identify antigens common to SS2 and SS9 for vaccine development. Cell wall proteins extracted from SS2 strain HA9801 were screened by two-dimensional Western blot using anti-SS2 sera, anti-SS9 sera, or pre-immune sera pooled from specific pathogen free (SPF) mice. Protein spots on preparative gels were excised and identified by matrix-assisted laser desorption ionization time-of-flight mass spectrometry, which led to the identification of four shared immunogenic proteins (arginine deiminase, translation elongation factor-Ts, o-acetylserine lyase, and 1-phosphofructokinase). The genes encoding these four proteins from SS9 strain GZ0565 were cloned and their proteins were overexpressed in Escherichia coli BL21. Western blot analysis of these recombinant proteins using the convalescent serum of an SPF mini-pig inoculated with the SS2 strain, anti-SS2 sera, and anti-SS9 sera pooled from SPF mice further confirmed the immunogenicity of these proteins. These immunogenic proteins, which are encoded by genes that are reasonably conserved among SS2 and SS9 strains, could be developed as vaccine candidates. 相似文献
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几种除草剂防除苜蓿地杂草的试验 总被引：5，自引：1，他引：4
苜蓿地中以马唐、狗尾草等禾本科杂草为主，其鲜重占整个杂草鲜重的90．04％－97．84％，每单位重量的干草中，杂草所占的比例为66．7％－76．3％，盖草能、金豆和普施特3种除草剂在不同剂量下对上述杂草防除结果表明：各处理均比对照有不同程度的增收，5％普施特水剂增收较为明显的是水平4（用药量为2400ml/hm^2)，比对照增加收入的比例为171．2％－174．9％，4％金豆增收较为明显的为水平3（用药量为1500ml/hm^2)，比对照增加收入的比例为193．9％－198．1％，12．5％盖草能增收较为明显的为水平2（1050ml/hm^2)，水平3（1350ml/hm^2)，比对照增加收入的比例分别为200．9－202．4％和196．6％－198．5％。 相似文献
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