不同施肥模式对黄金桂春茶产量的影响   总被引：3，自引：0，他引：3  

苏火贵 《福建农业科技》2014,(3):17-18

在安溪县黄金桂茶园设置氮磷钾肥效田间试验,结果表明：施用氮磷钾肥分别使春茶茶青增产15.4%、6.1%和9.3%,经济效益提高12.8%、5.0%和8.1%。最佳施肥模式为每667 m2施N 20 kg、P2O57 kg和K2O 7 kg,三要素比例为1∶0.35∶0.35。  相似文献   

可移植的UART底层驱动构件设计     

蔡剑卿  王宜怀  冯德旺  罗超 《福建农业大学学报(自然科学版)》2014,(3):332-335

以飞思卡尔公司基于ARM Cortex-M4内核的K60系列微控制器为例,设计了一种具有较好可移植性和重用性的UART底层驱动构件．测试结果表明该构件正确而有效．  相似文献   

三种内生真菌与大花蕙兰共生对矿质营养吸收的影响   总被引：30，自引：0，他引：30  

赵杨景  郭顺星  高薇薇  杜淑燕 《园艺学报》1999,26(2):110-115

以从兰科植物出的内生真菌与大花蕙兰接种，均能形成菌根，其中ＧＣ９４１和ＧＣ９４５两种菌只侵染根的表皮细胞，在细胞内呈菌丝结结构，而ＧＣ９３４菌在侵染前期同前两和种真菌，后期菌丝可部分侵染皮层细胞，并呈疏松的分枝状结构。３种内生真菌可使幼苗茎叶干重比增施矿质营养但不接种真菌的处理（ＣＫ２）提高１７３．２％－２５０．１％，并对植株吸收Ｎ，Ｐ，Ｋ养分有促进作用，其中ＧＣ９４５菌使幼苗吸收Ｎ和Ｋ的量比ＣＫ  相似文献   

几种蔬菜的钾肥效应研究   总被引：2，自引：1，他引：1  

郭熙盛  叶舒娅 《安徽农业科学》1999,27(4):396-398

不同蔬菜在不同土壤上的施钾效应研究结果表明：施用钾肥，能促进蔬菜植株的生长，显著提高产量。在一定钾肥用量范围内，产量随钾肥水平提高而提高，超过一定量时，产量并不增加。钾素营养能提高果实中 Ｖｃ 和全糖的含量，改善贮藏特性。 Ｖｃ 含量的提高效应与产量效应一致，但糖分的含量在稍低钾素水平上出现。由于产量提高和品质改善的效应，施钾经济效益十分显著，产投比大。  相似文献   

Compare the ability of potassium absorption in different tobaccos varieties under low potassium condition     

《湖南农业科学》2008,(2)

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Cardiovascular Responses to Glibenclamide During Endotoxaemia in the Pig     

Vanelli  G.  Hussain  S.N.A.  Dimori  M.  Aguggini  G. 《Veterinary research communications》1997,21(3):187-200

Vanelli, G., Hussain, S.N.A., Dimori, M. and Aguggini, G., 1996. Cardiovascular responses to glibenclamide during endotoxaemia in the pig. Veterinary Research Communications, 21(3), 187-200The effects of blockading the ATP-sensitive potassium channel (K+ATP channels) on endotoxin-induced vascular derangements was studied. Escherichia coli endotoxin was infused (20 µg/kg per h) intravenously for 180 min into anaesthetized, mechanically ventilated, indomethacin-treated pigs. After 150 min of endotoxaemia, glibenclamide (a K+ATP channel blocker) was infused intravenously at 2 mg/kg per min for 5 min. The cardiovascular parameters were recorded before (control), every 30 min up to 150 min during endotoxaemia, and then at 5, 15 and 30 min after administration of glibenclamide. Infusion of endotoxin reduced the systemic arterial pressure to 60.6% ± 3.7% (p < 0.01) and increased the pulmonary arterial pressure by 75.9% ± 11.0% (p < 0.01) of the control values. Within 5 min, infusion of glibenclamide transiently but significantly reversed the systemic hypotension by raising the systemic vascular resistance, whereas the increased pulmonary arterial pressure was further augmented. Glibenclamide infusion did not influence the cardiac output. Within 30 min, the cardiovascular parameters had returned to the values induced by endotoxin, except for the systemic vascular resistance. Infusion of glibenclamide into normal pigs did not change the systemic pressure or resistance, but the pulmonary pressure and resistance were augmented transiently. These data suggest that, in pigs, the ATP-sensitive K+ channels may be one factor playing a role in the vascular changes due to endotoxaemia, especially in the systemic circulation.  相似文献   

钾调节茎用芥菜同化物运输及茎部膨大的作用机理   总被引：6，自引：0，他引：6  

马全民  陆定志 《园艺学报》1992,19(4):347-352

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Temperature,Mg and Al Interaction Effects on Grass Tetany Potential of Ryegrass Forage1     

Z. Rengel  D. L. Robinson 《Journal of Agronomy and Crop Science》1991,166(5):347-352

Two annual ryegrass (Lolium multiflorum Lam.) cultivars differing in Al sensitivity were grown in nutrient solution at pH 4.2 to assess the effects of temperature (10/6 and 22/18 °C day/night), Mg (0.1 and 1 mM) and Al solution concentrations (0, 3.7 and 74 μ M) on several factors influencing grass tetany potential of forage. Added Al depressed Mg and Ca shoot concentrations and increased shoot K/(Ca + Mg) equivalent ratio especially after prolonged treatment at higher temperature and lower Mg solution concentrations. These effects were more pronounced in the relatively Al-sensitive cultivar Wilo which appeared to be less Mg-efficient as well. Grass tetany potential will therefore be higher following a temperature rise if Al-sensitive ryegrass is grown in a medium containing low Mg and high Al levels.  相似文献   

Effect of gonadotropin-releasing hormone analogue on human breast cancer cell line in vitro     

ZHANG Xiao-juan  DONG Shi-zhong  MA Yan-qing  YANG Lu-ming 《园艺学报》2015,31(1):130-134

AIM: To investigate the effects of gonadotropin-releasing hormone (GnRH) analogue on the growth of breast cancer cell lines MCF-7 and MDA-MB-231 in vitro and to explore the related mechanisms with PI3K/Akt or ERK/MAPK pathways. METHODS: The proliferation of human breast cancer cell lines MCF-7 and MDA-MB-231 treatment with triptorelin was detected by MTT assay and the distribution of the cell cycle was determined by flow cytometry. The phosphorylation of the ERK1/2 and Akt was evaluated by Western blotting. RESULTS: Triptorelin inhibited the proliferation of MCF-7 cells at concentration of 10^-5 mol/L after treated for 192 h or at concentration of 10^-4 mol/L after treated for 168 h and 192 h. Triptorelin inhibited the proliferation of MDA-MB-231 cells at concentration of 10^-4 mol/L after treated for 192 h (P<0.05).Treatment with triptorelin for 192 h at concentration of 10^-4 mol/L had no statistical significance effect on phosphorylation of ERK1/2 and Akt(P>0.05).CONCLUSION: Inhibitory effect of GnRH analogue triptorelin on human breast cancer cells is not just the connection with the down-regulation of pituitary hormone, but also a direct inhibitory effect. The role may not be involved in the activation of ERK/MAPK and PI3K/Akt signaling pathways.  相似文献   

棉花品种间苗期钾吸收效率的差异研究   总被引：6，自引：0，他引：6  

张志勇  王刚卫  田晓莉  段留生  王保民  董学会  张明才  何钟佩  李召虎 《棉花学报》2007,19(1):47-51

在水培条件下研究了转基因抗虫棉中棉所41和常规棉中棉所36、中棉所35三个品种苗期钾吸收效率的差异及其机制.结果表明,在营养液中钾浓度为0.5 mmol·L-1,可使棉花幼苗生长速率达到最高生长速率80%左右的条件下,中棉所35和中棉所41在6～7叶期的生物量和体内钾吸收量显著高于中棉所36.中棉所35的吸钾量多主要与其根系活跃吸收表面积大有关;中棉所41的吸钾量多可能是相对较大的根系活跃吸收表面积和相对较高的Imax综合作用的结果.中棉所36的Imax虽然显著高于其它两个品种,但体内钾累积量却比较低,这与其较小的根系活跃吸收表面积有关,该品种体内较高的钾浓度也可能对吸收产生反馈抑制作用.在本试验条件下,转基因抗虫棉中棉所41的苗期钾吸收能力与常规棉相比并不低.  相似文献