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1.
几种杀菌剂对玉米苗枯病菌毒力测定及防效试验 总被引：5，自引：0，他引：5
选用7种杀菌剂对玉米苗枯病菌（Fusanummoniliforme）菌丝生长和分生孢子萌发进行了室内毒力测定和田间盆栽防效试验。毒力测定结果表明：适乐时、烯唑醇、立克秀对菌丝生长有明显的抑制作用，EC50分别为0.04、0.12和0.19μg／g。多菌灵、福美双对孢子萌发有明显的抑制作用，EC50分别为0．17和1．77μg／g。盆栽试验结果表明：适乐时、福美双拌种对玉米苗枯病有较好的防治效果，相对防效分别达到54．8％和52．3％。生产上可交替使用。 相似文献
2.
榕母管蓟马是一种榕树上的主要害虫,以成虫、若虫吸取植物组织内汁液危害。文章用浸叶法测定吡虫啉、艾绿士、毒死蜱三种药剂对榕母管蓟马不同虫态进行室内毒力测定。结果表明:各药剂对榕母管蓟马各龄虫态的防治效果依次为:毒死蜱>艾绿士>吡虫啉;毒死蜱二龄、三龄、成虫的致死中浓度(LC50)分别为0.019、0.063、0.142mg/L;单一药剂对榕母管蓟马不同虫态的室内毒力强弱依次为:二龄若虫>三龄若虫>成虫。 相似文献
3.
在硫酸介质中,抗坏血酸存在下,痕量铅能灵敏地催化溴酸钾氧化吖啶红褪色．研究了该催化褪色反应的最佳条件,建立了一种测定痕量铅的新方法．该方法的线性范围为20-85μg·L^-1,检出限为3×10^-7μg·L^-1．用于中药中铅的测定,相对标准偏差为1．73％～4．06％,加标回收率为97．1％～103．8％．实验结果表明,在三种中药中,山药中铅的含量最高,山楂中铅的含量最低． 相似文献
4.
开发利用天然杀虫剂是当今科学界热点的课题之一。本试验采用苦楝、黄花蒿、银杏等三种植物浸出液对菜青虫进行田间防治。试验表明，三种植物浸出液对菜青虫的田间防治效果随着自身浓度的升高而升高，其中，苦楝4倍液对菜青虫的防治效果最好，药后1、2、3天的防效分别达88．7％、87．9％和88．7％。其他2种植物浸出液也表现出较好的防效。 相似文献
5.
野生柳叶蜡梅叶营养成分分析 总被引：1，自引：0，他引：1
以黄山市休宁县齐云山野生香风茶为研究对象,应用高效液相色谱、原子吸收光谱以及其他常规化学分析技术测定其中成分。结果为:蛋白质、粗脂肪含量分别为27．86％、31．2％,粗纤维、可溶性总糖分别为11．7％、7．26％,水分和灰分分别为7．467％、7．15％;游离氨基酸总量为1．12％;维生素B1、B2和维生素C分别为0．1001mg/100g、1．301mg/100g、33．6mg/100g;矿质元素Ca、Mg分别为300mg/100g、340mg/100g,Fe、Zn和Se等分别为15．37mg/100g、8．11mg/100g及0．0135mg/100g。 相似文献
6.
本研究建立了快速溶剂萃取-固相萃取-高效液相色谱（ASE—SPE—HPLC）分析湖泊环境中沉积物、水体及鱼样品中四溴双酚A的方法。沉积物和鱼样品用正己烷-二氯甲烷提取后,与水样一起用固相萃取C18小柱富集纯化,外标法定量,高效液相色谱检测。结果表明,加标浓度0．11000ng·mL^-1四溴双酚A的平均回收率为：96．8799．3％;不同浓度平行测量的相对标准偏差为0．161．00％。应用建立的方法对巢湖湖泊环境样品进行了测定,沉积物四溴双酚A浓度为21．96—481．80μg·kg^-1,水体为0-4．77μg·L^-1,鱼为7．9—83．5μg·kg^-1。 相似文献
7.
5％菌毒清水剂对黄瓜霜霉病有较好的防治效果,叶片喷施结果表明：5％菌毒清水剂200倍液防效可达96．2％,而72．2％普力克水剂600倍液其防效为93．5％,二者的药效差异虽不显著,但施用前者比施用后者可降低成本36．4％。田间应用菌毒清的最佳稀释浓度为200倍液。 相似文献
8.
研究了在pH11．5～12．5的NH3-NH4Cl介质和TritonX-100存在下,镉试剂2B与铊（Ⅲ）的显色反应。铊（Ⅲ）与镉试剂2B形成红色配合物,在测定波长500nm处,表观摩尔吸光系数为7．29X10·L·mol-1·cm-1,线性方程为A=0．0139C＋0．0032,相关系数是0．9993,线性范围是肛800μg／L。建立了采用纳米氧化铝吸附铊（Ⅲ）,与其他干扰元素分离,在水相体系快速、准确测定多金属结核GBW07296和环境水样中痕量铊的方法,回收率为96-102％,相对标准偏差不大于2．4％。 相似文献
9.
田间药效试验结果表明,用10%吡·灭WP防治棉蚜有良好的防治效果。每公顷用药量以600～750g为宜,防效可达78.37%～89.64%,持效期7～10d,并对作物安全。 相似文献
10.
董艳辉 《通化师范学院学报》2008,29(2):46-47
采用加热回流提取法提取当归龙荟丸中的阿魏酸,并利用色谱柱Agilent C18（4．0·125mm,5．0μm）,以甲醇-3％冰醋酸溶液（20：80）为流动相,流速1、0mL／min,柱温：25℃,测定波长：320nm．测定阿魏酸在0．2116-3．174μg范围内线性关系良好（r=0．9995）,平均回收率96．7％,RSD=0．4％． 相似文献
11.
目的观察头孢哌酮/舒巴坦治疗呼吸系统感染的疗效及安全性。方法对2006年1月～2010年12月175例用头孢哌酮/舒巴坦治疗呼吸系统感染的情况进行回顾性研究,总结其疗效及毒副作用。结果头孢哌酮-舒巴坦的用量每日2g～4g,疗程5～18天;用药后3～6.5天体温下降,体温下降率92.0%;白细胞数升高者用药后85.4%降至正常范围,炎性X线征象52.6%消失或明显吸收好转,痰细菌培养阳性者细菌清除率为85.1%;总有效率为86.9%,无效者中有12例为严重粒细胞缺乏;有16例丙氨酸转氨酶短暂升高,余未见其它副作用。结论头孢哌酮/舒巴坦治疗呼吸系统感染安全有疗效。 相似文献
12.
刘传会 《襄樊职业技术学院学报》2010,9(3):20-21,29
采用含药饵料饲喂平菇厉眼菌蚊的方法测得锐劲特对对平菇厉眼菌蚊幼虫的LC50为0.0622 mg/g,高效氯氟氰菊酯对平菇厉眼菌蚊幼虫的LC50为0.0048 mg/g,表明这两种药剂对平菇厉眼菌蚊的毒力较高效氯氰菊酯强。在生产中试用,锐劲特和高效氯氟氰菊酯对平菇厉眼菌蚊防治效果达到90%。 相似文献
13.
Imidacloprid in processed tea and tea liquor 总被引：1，自引：0，他引：1
Sanyal N Hazra D Pal R Somchaudhury AK Chowdhury A 《Journal of Zhejiang University. Science. B》2006,7(8):619-622
Imidacloprid is a newly introduced broad-spectrum chloronicotinyl insecticide and will find its way in agricultural production, particularly in Asia. However, information on the fate of imidacloprid in crop plants is lacking. The degradation of imidaclopnd in processed CTC tea and tea liquor was investigated in the present study in which imidacloprid was applied at recommended application rate （30.0 g a.i./ha） and twice the recommended application rate （60.0 g a.i./ha） for three consecutive seasons. Imidacloprid was rapidly dissipated in processed tea following first order reaction kinetics at all application rates and had half-lives of 0.9 1-1.16 d with the residue in tea liquor found to be below detectable limit on 3rd day samples. The study revealed that imidacloprid is safe for human consumption and will not pose any residual toxicity problem. 相似文献
14.
Ahmad G Jan A Arif M Jan MT Khattak RA 《Journal of Zhejiang University. Science. B》2007,8(10):731-737
Field experiments were conducted at Cereal Crops Research Institute, Pirsabak, Nowshera, Pakistan, during winter 2003~2004 and 2004~2005 to evaluate the effect of nitrogen and sulfur levels and methods of nitrogen application on canola (Brassica napus L. cv. Bulbul-98) under rainfed conditions. Four levels of S (0, 10, 20, and 30 kg/ha) and three levels of N (40, 60, and 80 kg/ha) and a control treatment with both nutrients at zero level were included in the experiments. Sulfur levels were applied at sowing while N levels were applied by three methods (100% soil application, 90% soil 10% foliar application, and 80% soil 20% foliar application). The experiments were laid out in randomized complete block (RCB) design having four replications. Oil content increased significantly up to 20 kg S/ha but further increase in S level did not enhance oil content. Glucosinolate content increased from 13.6 to 24.6 μmol/g as S rate was increased from 0 to 30 kg/ha. Protein content increased from 22.4% to 23.2% as S rate was increased from 0 to 20 kg/ha. Oil content responded negatively to the increasing N levels. The highest N level resulted in the highest values for protein (23.5%) and glucosinolate (19.9 μmol/g) contents. Methods of N application had no significant impact on any parameters under study. 相似文献
15.
Protoporphyrinogen oxidase inhibitor has become the focus research field as herbicides.Seven novel N-benzoxazolonyluracils were obtained by cyclization of 6-aminobenzoxazolone derivatives with ethyl 3-dimethylcarbamoylamido-4,4,4-trifluorocrotonate and then methylation or amination, and the reaction yields were between 59%-86%. The chemical structures of the compounds were identified by Elemental Analysis, MS and ^1H NMR. Biological results indicate that some compounds exhibit excellent control of broadleaf weeds at post-emergence by low dosage 18.75 ga.i/ha, but are not effective for grass weeds below dosage 37.5 ga. i/ha. In addition, these compounds show no damage at high-dosage 150 ga. i/ha to wheat and corn, but are unsafe to dicotyledonous plants such as cole, soybean and sorghum even at lower dosage 18.75 ga. i/ha. 相似文献
16.
室内测定了樟脑和对二氯苯2种防蛀剂对花斑皮蠹的熏蒸效果．结果表明：处理剂量为200、100、50g／m。时樟脑对花斑皮蠹幼虫的熏蒸死亡率分别为74％、44％和24％;处理剂量为40、20、10g／m^3时对二氯苯对花斑皮蠹幼虫的熏蒸死亡率分别为100％、90％和60％,熏蒸活性与剂量均呈正相关;樟脑和对二氯苯对花斑皮蠹幼虫的致死中量（LD50）分别为1．066mg／m,和0．375mg]m^3,说明对二氯苯对花斑皮蠹幼虫的熏蒸毒力要优于樟脑．处理剂量为200、100、50g／m,时樟脑对花斑皮蠹成虫的熏蒸死亡率分别为100％、80％和60％;处理剂量为40、20、10g／m^3时对二氯苯对花斑皮蠹成虫的熏蒸死亡率均为100％,说明对二氯苯对花斑皮蠹成虫的熏蒸活性较高． 相似文献
17.
Targeted yield concept and a framework of fertilizer recommendation in irrigated rice domains of subtropical India 总被引：1，自引：0，他引：1
Bera R Seal A Bhattacharyya P Das TH Sarkar D Kangjoo K 《Journal of Zhejiang University. Science. B》2006,7(12):963-968
Soil test crop response （STCR） correlation studies were carried out in Vindhyan alluvial plain during 2001 to 2004 taking IR-36 as test crop to quantify rice production in the context of the variability of soil properties and use of balanced fertilizers based on targeted yield concept. The soils were developed on gently sloping alluvial plain with different physiographic settings and notable variation in drainage condition. Soil properties show moderate variation in texture （loamy to clay）, organic carbon content （4.4 to 9.8 g/kg）, cation exchange capacity （10,2 to 22.4 cmol （p＋）/kg） and pH （5.3 to 6,4）, Soil fertility status for N is low to medium （224 to 348 kg/ha）, P is medium to high （87 to 320 kg/ha） and K ranges from medium to high （158 to 678 kg/ha）. Database regarding nutrient requirement in kg/t of grain produce （NR）, the percent contribution from the soil available nutrients [CS （%）] and the percent contribution from the applied fertilizer nutrients [CF （%）] were computed for calibrating and fbrmulating fertilizer recommendations. Validity of the yield target for 7 and 8 t/ha was tested in farmers＇ fields and yields targets varied at less than 10%. The percent achievement of targets aimed at different level was more than 90%, indicating soil test based fertilizer recommendation approach was economically viable within the agro-ecological zone with relatively uniform cropping practices and socio-economic conditions. 相似文献
18.
Pal R Chakrabarti K Chakraborty A Chowdhury A 《Journal of Zhejiang University. Science. B》2005,6(8):756-758
INTRODUCTION Pencycuron [1-(4-chlorobenzyl)-1-cyclopentyl- 3-phenylurea], a relatively new non-systemic protec-tive fungicide for controlling sheath blight (Rhizoc-tonia solani) of rice (Sylvanie and Cornis, 1989; Tomlin, 1997), is expected to be used widely in ag-ricultural production particularly in Asia. However, information on the dissipation pattern of pencycuron in rice plant is lacking. Little information on the en-vironmental fate of pencycuron has been published although there … 相似文献
19.
Potential growth of two widely-grown hybrid rice varieties in the Jinhua district of Zhejiang Province, Shanyou63 for mid-rice and Xieyou46 for late rice, was simulated using a crop growth model of WOFOST. Parameters of the rice growth in WOFOST were calibrated through field experiments from 1999 to 2002 in Jinhua. The potential yield simulated with WOFOST was about 12 t/ha for Shanyou63 and 10 t/ha for Xieyou46, which are in good agreement with the highest recorded yield obtained in this area. Under farmers practice, current yield is about 7.5 t/ha for Shanyou63 and 6.5 t/ha for Xieyou46. There is a gap between the actual rice yield and the potential yield for these two hybrid rice varieties grown in this area. The attainable target yields were set to 70% to 75% of their potential yields for the two varieties. A recently developed software ＂Nutrient Decision Support System （NuDSS）＂ for irrigated rice was used to optimize nutrient management for these two rice varieties. According to NuDSS, the optimal fertilizer N requirement for the target yields was about 150 kg/ha for Shanyou63 and about 120 kg/ha for Xieyou46, which were only about 70% of the fertilizer N application under current farmers＇ practice. Comparing with farmers＇ practice, there is great potential to increase actual rice yields and to reduce fertilizer N use rates by improving rice crop management practice in Jinhua. 相似文献
20.
本研究采用二次通用旋转组合设计的方法,建立了以小麦产量和野燕麦防除率(％)为目标函数,考虑“燕麦枯”药剂施药量(公斤/公顷),喷液量(公斤/公顷)和施药时期(月/日)三个决策变量的数学模型。通过对模型的综合分析寻优提出:在麦田野燕麦危害严重地区(减产30％以上),“燕麦枯”施药量为8.25——10.05公斤/公顷,喷液量为450——675公斤/公顷,施药时期为12月/10日或翌年3月/10日前后的优化技术方案。运用此“燕麦枯”麦田施用技术,可获小麦每公顷产量4050公斤以上和野燕麦防除率75％以上。 相似文献