Results 91 to 100 of about 678 (143)

[Preparation of a novel polyhydroxy silica stationary phase and application in the separation of alginate oligosaccharides]. [PDF]

Se Pu
Jiao RW, Zhang DD, Hu XY, Zhu WT, Li X, Cai YD, Ren DD, Wang QK, Wu L, Zhou H.   +9 more
europepmc   +1 more source

Utilization rate of fertilizer N and dynamic changes of soil NO_3~--N in summer maize field in semi-humid area of Northwest China.

, 2008
以土垫旱耕人为土为供试土壤,通过田间试验,研究了不同施氮量下(0、45、90、135和180 kg.hm-2)夏玉米生育期土壤剖面NO3--N的变化特征、氮素利用率及施氮量与土壤NO3--N残留的关系.结果表明:在整个生育期内,土壤NO3--N含量均以0~20 cm土层最高,且施氮量越高,NO3--N含量也越高;0~60 cm土层NO3--N含量变化显著,60~100 cm土层NO3--N含量变化不大.夏玉米整个生育期,受玉米对氮素的需求和降雨的影响,0~100cm土层NO3--N累积量呈波动式降低趋势;
李世清, 李生秀, 范亚宁
core  

[Exercise-induced hyperinsulinism: genetic basis and clinical management]. [PDF]

Zhongguo Dang Dai Er Ke Za Zhi
Zhang QT, Hou L.
europepmc   +1 more source

NITROGEN UPTAKE AND FERTILIZER NITROGEN USE EFFICIENCY OF WHEAT UNDER DIFFERENT SOIL WATER CONDITIONS

, 1999
本研究结果表明，同一施氮量处理小麦地上生物量、茎叶产量和籽粒产量随土壤水分含量的增加而提高，在同一土壤含水量下，这３ 种产量则随氮素肥料施用量的增加而增加。小麦成熟后地上部吸收总氮量的方差分析显示出施氮处理和水分处理对小麦吸氮量的影响达到显著水平，同一施氮处理小麦地上部吸氮总量随土壤含水量的增加而增加，在３ 种土壤水分含量条件下，小麦的吸氮量均随施尿素氮肥量的增加而提高。施尿素处理的土壤Ａ 值随土壤含水量的增加而降低；尿素与猪粪配施处理的土壤Ａ 值则随土壤含水量的增加而增加。在相同施肥量下 ...
余存祖, 张卫, 王百群
core  

[Different Astragalus medicinal pairs improve diabetic nephropathy in mice by regulating lipid peroxidation through PTGS2]. [PDF]

Nan Fang Yi Ke Da Xue Xue Bao
Chen X, Jing Y, Liang H, Zhong J, Chen Z, Peng Y, Dai J, Xiao Y.   +7 more
europepmc   +1 more source

Study on nitrogen movement under localized compaction and ridge tillage by use of artificial rainfall

, 2003
利用人工模拟降雨研究了成垄压实施肥条件下不同的垄坡度及不同压实的障碍层对硝态氮迁移的影响。结果表明,对一次60mm的降雨,无障碍层存在时,平地施肥条件下NO-3 N淋溶剧烈,土壤表层施肥部位的NO-3 N仅余总施入量的0 1%左右。垄沟施肥因其将入渗水分与施肥区分开,从而可以降低NO-3 N的淋溶。不同的垄坡度对NO-3 N残留量略大于20°、40°。相对于不同坡度垄沟,3 N的淋溶略有影响,30°垄坡条件下上层土壤NO-在施肥带部位通过压实形成水分运动的障碍层对防止NO-3 ...
赵允格, 邵明安
core  

[Research progress on the causes of pain in knee osteoarthritis]. [PDF]

Zhongguo Xiu Fu Chong Jian Wai Ke Za Zhi
Wei N, Zheng Z.
europepmc   +1 more source

Study of Potassium Nutrition of Wheat and Fertilizer Use Efficiency under Long-term Fertilization Conditions in Dryland of Loess Region

, 2008
为了给黄土旱地经济合理施肥、粮食增产提供科学依据。[方法]在长期定位试验的基础上,研究了不同施肥对小麦产量、各生育期钾素营养和肥料利用率的影响。[结果]不同施肥小麦增产效果差异显著。单施氮肥小麦增产75.3%,单施磷肥小麦产量则降低24.7%,NM、PM、NPM配施小麦增产75.9%~92.9%;小麦钾素的吸收主要集中在生长发育前期,孕穗期以后因泌钾现象多表现为负吸收,施用有机肥,特别是无机肥与有机肥配施,促进小麦吸钾作用明显,小麦植株各器官含钾量明显提高;单施N肥、NP配施小麦钾素的吸收量 ...
李燕敏, 赵云英, 郝明德
core  

[Effect of Blood Biochemical Indicators on Exercise Duration in Patients With Stages 3-5 Chronic Kidney Disease: The Mediating Role of Physical Function Status]. [PDF]

Sichuan Da Xue Xue Bao Yi Xue Ban
Yang Y, Chen H, Liu W, Qi X.
europepmc   +1 more source

[The role and mechanism of chemokine network in promoting osteoarthritis progression by regulating synovial macrophage heterogeneity]. [PDF]

Zhongguo Xiu Fu Chong Jian Wai Ke Za Zhi
Lin Y, Wu L, Chen Q, Shen B.
europepmc   +1 more source