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9种杀菌剂防治水稻穗颈瘟田间药效比较 总被引:1,自引:0,他引:1
为筛选防治水稻穗颈瘟高效、低毒、安全杀菌剂,采用田间小区试验对嘧菌酯等9种杀菌剂进行药效比较。结果表明:50%嘧菌酯WG 180.0 g/hm2、20%稻瘟酰胺SC 300.0 g/hm2、40%稻瘟灵WP 600.0 g/hm2、75%三环唑WP 281.3 g/hm2的防效较高,病穗率防效及病指防效分别为85.86%~87.47%及89.68%~90.93%;50%醚菌酯WG 120.0 g/hm2、12.5%氟环唑SC 100.0 g/hm2、10%己唑醇SC 75.0 g/hm2、430 g/L戊唑醇SC 80.6 g/hm2处理的病穗率防效及病指防效分别为72.74%~80.85%及78.61%~84.34%;25%咪鲜胺EC 337.5 g/hm2处理的防效较差,病穗率防效及病指防效分别为66.59%和72.70%。防治水稻穗颈瘟可以选用三环唑、稻瘟灵、稻瘟酰胺、咪鲜胺等常规杀菌剂及嘧菌酯、氟环唑、戊唑醇等新型高效杀菌剂。 相似文献
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几种杀菌剂对水稻稻曲病的防治研究 总被引:3,自引:0,他引:3
水稻稻曲病是水稻生产上一种重要的真菌病害,近年发生严重。本试验选用30%爱苗EC(有效成分组成为:15%丙环唑+15%苯醚甲环唑)等7种不同杀菌剂在不同时期对水稻稻曲病进行了防治试验,以期为指导水稻生产上防治水稻稻曲病,正确选用药剂提供科学依据。结果表明,在破口前5~7d的施药防效普遍高于在始穗期的防效,其中30%爱苗EC15mL/667m2处理和20%井冈霉素SP6.5g/667m2处理的防治效果较好,均达到70%左右,而50%多菌灵WP62.5g/667m2处理的防效在所有处理中防效最低,仅在30%左右,且差异显著。 相似文献
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25%丙环唑EC防治水稻稻曲病和纹枯病效果与增产作用 总被引:8,自引:0,他引:8
25%丙环唑EC对水稻稻曲病和纹枯病具有良好的防治效果,保产、增产作用明显。试验表明,每亩用丙环唑有效成份2.5~7.5g,于水稻孕穗末期(距破口约6~8d)和破口期各用药一次,对稻曲病的株防效为73.72%~86.53%,粒防效为78.81%~88.95%;对纹枯病的丛防效、株防效和病指防效分别为88.64%~95.45%、89.00%~95.60%和93.83%~97.76%;提高水稻产量15.36%~16.68%。 相似文献
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[目的]为明确利用植保无人机喷施30%肟菌·戊唑醇悬浮剂对水稻稻瘟病和稻曲病的防治效果并筛选出最佳作业参数。[方法]2019年在辽宁东港开展了植保无人机防治水稻稻瘟病和稻曲病的田间试验。[结果]利用植保无人机喷施该药剂对稻瘟病和稻曲病防治效果均显著高于人工喷雾防治处理;无人机使用助剂处理防效比未使用助剂处理的防效好,且差异显著;无人机防治用水量由1.2 L/667m2增加到1.5 L/667m2时,防治效果显著增加。与空白对照相比,供试药剂处理显著降低秕粒率和增加千粒重,增产率在5.69%~9.95%之间。[结论]推荐在水稻孕穗末期和齐穗期各施药1次,使用30%肟菌·戊唑醇悬浮剂40 mL/667m2+飞防专用助剂15 mL/667m2,用水量1.5 L/667m2,无人机作业参数设置为4喷头,流速1.54 L/min,作业高度2 m,间距4 m,速度2.9 m/s,能有效防治稻瘟病和稻曲病。 相似文献
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《现代农药》2015,(4)
为筛选防治水稻稻曲病的高效、低毒、安全杀菌剂,采用田间小区试验对吡唑醚菌酯等8种杀菌剂的田间药效进行了比较。结果表明:三唑类杀菌剂10%苯醚甲环唑WG 90 g/hm2、250 g/L丙环唑EC 90 g/hm2、12.5%氟环唑SC 90 g/hm2、430 g/L戊唑醇SC 90 g/hm2及甲氧基丙烯酸酯类杀菌剂250 g/L吡唑醚菌酯EC 112.5 g/hm2、250 g/L嘧菌酯SC 112.5 g/hm2处理的防效均在80%以上,显著高于25%咪鲜胺EC 337.5 g/hm2及20%井岗霉素SP 150 g/hm2处理的防效。在试验条件下,8个供试药剂对水稻后期生长无药害。 相似文献
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为筛选防治黄瓜白粉病的高效、低毒、安全杀菌剂,对戊唑醇等7种杀菌剂进行田间药效试验。结果表明:43%氟菌·肟菌酯SC 192.6 g/hm~2、300 g/L醚菌·啶酰菌SC 270 g/hm~2处理的防效较高,病指防效分别为88.69%和83.30%;430 g/L戊唑醇SC 96.75 g/hm~2、37%苯醚甲环唑WG 90 g/hm~2、36%硝苯菌酯EC 216 g/hm2处理的病指防效分别为78.75%、73.23%和74.55%;250 g/L嘧菌酯SC 337.5g/hm~2、250 g/L吡唑醚菌酯EC 150 g/hm~2处理的防效较差,病指防效分别为49.40%和47.78%。 相似文献
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Dinesh Singh J. K. Gehlawat Musti S. Rao 《Journal of chemical technology and biotechnology (Oxford, Oxfordshire : 1986)》1990,47(2):127-136
Oslefins and diolefins are important intermediates in the petrochemical industry and the future promises a further substantial increase in demand. While several catalysts have been formulated in the past for the abstraction of hydrogen from butenes and propylene, these catalysts are inefficient in the abstraction of first hydrogen from butane. Bismuth molybdates (β and γ-phases) containing iron oxide and supported on alumina are used as catalysts in the present investigation on the oxidative dehydrogenation of n-butane. Effects of catalyst content, temperature and oxygen: n-butane ratio on conversion and selectivity to butadiene and (C4H8 + C4H6) are studied in the following ranges of experimental conditions: β-bismuth molybdate/100 mol support I(K), 3–9; γ-bismuth molybdate/100 mol support I(K), 5-20; temperature, 400–500°C; O2: butane ratio, 0.6:1.7. 相似文献
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考登钢作为一种高耐候结构钢,广泛应用于各个领域。在火力发电方面,考登钢主要应用在工作环境比较恶劣的烟气加热器和空气预热器中。考登钢表面涂搪的目的就是进一步提高其耐腐蚀性能,延长使用寿命。为了提高考登钢元件的使用寿命,对考登钢表面涂搪瓷的可行性、密着性能、瓷釉、工艺控制、质量保证等方面进行了研究。 相似文献
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A viscometer used to measure the viscosity of 10 μl of a liquid, must be miniaturized down, and the liquid velocity gradient in the channel used to determine the viscosity coefficient. Two major factors that affect the liquid velocity are the mechanical forces exerted by the mechanical motors and electromagnetic forces. In this study, electrowetting on dielectric (EWOD) is adopted to drive liquids. Variously sized electrodes on a chip, and two shapes of channel are employed to measure the velocity gradient to determine the viscosity coefficient. The device is fabricated by microelectromechanical system (MEMS) technology. The dielectric layer used in EWOD has a high dielectric constant, BST (Ba0.7Sr0.3TiO3), to reduce the required applied voltage; its surface is coated with hydrophobic polymer, polytetrafluoro-ethylene (PTFE, Teflon® AF DuPont). Experimental results demonstrate that liquids can be pulled at 660 μm/s in linear channels by applying a voltage of 15 V. 相似文献
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In reexamining medium effects on photochemical reactions, we have emphasized those on unequilibrated excited species such as the Franck-Condon species. Despite recent advances in femtochemistry, such a discussion in molecular photochemistry is uncommon, and the problem remains challenging on account of the extremely short-lived excited species. However, in such cases, a small perturbation resulting from, for example, weak guest-host interactions could turn into a determining factor in dictating the course of a photochemical channel of deactivation. Examples of medium-directed diabatic processes have been examined with this idea in mind. A modified view on rhodopsin photoisomerization is presented along with the consideration that confinement does not necessarily lead to inhibition of reactions of the trapped substrate. 相似文献
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研究了温度和pH值对漆酶酶活以及漆酶处理纤维压制纤维板性能的影响。结果表明,pH较低、温度较高时漆酶酶活较高,压制的纤维板强度性能较好。但温度太高(60~80℃),延长加热时间,漆酶稳定性变差,酶活明显降低,压制纤维板的强度下降。 相似文献
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采用实验方法考察工艺参数对沉降斑的影响。基于一个带凸台的平板模具,采用L27(313)正交矩阵进行实验,研究了几何尺寸、熔体温度、注射时间、保压压力及保压时间对厚度突变处沉降斑形成的影响,同时还考虑了熔体温度和注射时间以及保压压力和注射时间之间的交互作用影响;通过性噪比分析和F检验优化成型工艺条件并对工艺参数的影响进行显著性分析。结果表明,对于厚度突变的平板制品,厚度突变的程度对其沉降斑形成的影响最大,其次为熔体温度,保压压力,保压时间等;采取减小厚度变化,降低熔体温度或增加保压压力和保压时间等措施,可以减小厚度突变处沉降斑,从而减少其对外观质量的影响;因素之间的交互作用对制品沉降斑的形成有一定的影响,熔体温度B和注射时间C之间的交互作用影响较为明显,而保压压力D和注射时间C之间的交互作用对该质量指标的影响最小,可以并入误差。 相似文献