6种杀菌剂对剑麻斑马纹病的田间药效试验

对6种防治剑麻斑马纹病的杀菌剂的田间药效试验结果表明:68%金雷WG 200倍液和90%疫霜灵WP 100倍液的防治效果最好,防效达90%以上;其次是55%敌克松WP 200倍液和70%甲基托布津WP 500倍液,防效在85%～90%之间;而50%烯酰吗啉WP 150倍液和64%克菌特WP 100倍液防治效果较差,防效低于50%。通过药剂防效和成本分析,建议在生产上可使用55%敌克松WP 200倍液和70%甲基托布津WP 500倍液来防治剑麻斑马纹病。     

不同氮磷钾配比对商洛华中五味子有效成分五味子乙素含量的影响

采用三因素四水平正交试验设计,于2009年在山阳高坝华中五味子基地进行了肥效田间试验。结果表明:不同氮磷钾配比对华中五味子乙素含量影响差异显著;各营养元素对五味子乙素含量影响依次为K>N>P;在本试验区条件下保证最佳华中五味子有效成分的施肥量以氮、钾元素配合施用效果好,果实中五味子乙素含量高,最佳肥料用量:N用量240 kg/hm2,K2O用量160 kg/hm2。     

调亏灌溉在农业中的应用

该文系统地阐述了调亏灌溉理论的发展及在农业生产中的应用,并提出来调亏灌溉技术运用过程中需要注意的问题,以期为调亏灌溉技术更好地服务于我国农业发展提供参考。      

几种杀菌剂防治果树腐烂病药效对比试验

在2007—2008年研究的基础上,用0.5%苦参碱水剂、40%福美砷可湿性粉剂、2.12%腐植酸铜水剂3种杀菌剂对苹果树腐烂病病菌进行田间药效对比试验。结果表明,0.5%苦参碱水剂800倍、1000倍、1200倍液对苹果树腐烂病的治愈率分别达到了98%,96%,93%,复发病疤防治效果分别为97.34%,94.87%,91.30%,明显优于40%福美砷可湿性粉剂50倍液及2.12%腐植酸铜水剂的防治效果。     

30%吡蚜·异丙威WP防治草莓蚜虫药效试验

田间药效试验结果表明:施用30%吡蚜.异丙威WP 450~600 g/hm2,药后1~14 d对草莓蚜虫的防治效果达79.96%~95.17%,显著高于30%吡蚜.异丙威WP 300 g/hm2的防治效果(76.22%~87.70%)和对照药剂10%吡虫啉600g/hm2的防治效果(62.58%~83.67%)。在田间施用30%吡蚜.异丙威WP 450~600 g/hm2,对草莓生长安全。     

浚单20不同密度群体冠层微生境研究

在90000、75000、60000株/hm~2种植密度条件下,研究了浚单20吐丝期、灌浆期群体冠层的微生境变化及叶斑病发生情况.结果表明,在吐丝期,冠层上层风速与种植密度呈负相关,且大于中、下层风速;在灌浆期,中、下层风速不同种植密度间差异不明显.在玉米不同生育时期,不同种植密度群体的上层光照强度差异均不显著,但中、下层尤其是中层穗位处的光照强度差异较大,表现为光照强度与种植密度呈负相关.在吐丝期,上层的温度表现为高、中密度大于低密度,在灌浆期不同种植密度间差异不明显,中层和下层的温度在吐丝期和灌浆期午后13:00左右时低密度高于中、高密度.群体湿度与种植密度呈正相关,且下层湿度依次高于中层和上层.玉米叶斑病随着种植密度的增加而加重.结合产量分析表明,浚单20种植密度以75000株/hm~2较为适宜.     

Screening of mungbean germplasm against mungbean yellow mosaic India virus and its vector Bemisia tabaci

Yellow mosaic disease (YMD) caused by whitefly (Bemisia tabaci) transmitted mungbean yellow mosaic India virus (MYMIV) is an important constraint of mungbean in Pakistan. One hundred sixty-two mungbean genotypes from eight different geographic regions were evaluated for resistance to MYMIV and its whitefly vector B. tabaci. Resistance levels were assessed by visual scoring of symptoms in the field under natural conditions, in net-house by artificial transmission through whitefly and in greenhouse using graft inoculation for two consecutive years in 2008 and 2009. None of the tested genotypes was found to be disease free, while considerable variation in responses was observed among the genotypes and testing methods. All genotypes were found to be systemically infected in the field. In 2008, 32 genotypes were found to be resistant and 67 were moderately resistant with severity index (SI) values ranging from 1.0 to 1.4 and from 1.5 to 2.4, respectively. In 2009 34 genotypes were found to be resistant and 38 were moderately resistant with the same SI value ranges as in 2008, and the remaining genotypes were moderately susceptible to highly susceptible. However, only 35 genotypes were found to be moderately resistant with SI values of 1.5-2.4 and latent periods (LP) of 17-21 days when evaluated using artificial transmission through whiteflies. Similar results were obtained when these genotypes were evaluated using graft inoculation. Significant differences in adult whitefly densities among tested genotypes were also observed during both years but no correlation between the number of whiteflies and disease severity was observed. The results indicated that these genotypes did not have a high level of resistance against MYMIV, however, they may provide sources of partial resistance which can be exploited in the breeding programmes to develop mungbean genotypes resistant to MYMD or they can be used directly as varieties to manage MYMD after evaluation for acceptable agronomic characteristics, adaptation and stability in various regions.     

30%爱苗EC防治水稻稻瘟病田间药效研究

[目的]验证30%爱苗EC对稻瘟病的防治效果。[方法]以优优128为供试水稻品种,在广东潮安县水稻种植区对该药剂进行了小区药效试验。[结果]施药后各药剂均未对水稻产生明显药害。30%爱苗EC 225 mL/hm2对水稻稻瘟病的防效达85.00%,30%爱苗EC 225mL/hm2与45%硫.三环唑WP 2.1 kg/hm2混合施用对水稻稻瘟病的防效可达99.16%。[结论]30%爱苗EC及混合药剂是防治水稻稻瘟病的特效药剂。     

水稻应用不同药剂对稻瘟病防治效果分析

通过对2%加收米、75%稻艳、80%多菌灵、三环唑、25%咪鲜胺5种药剂进行稻瘟病的田间防效对比试验,各个处理 分别喷施4遍.结果表明,75%稻艳可湿性粉剂防治效果最好,叶瘟防治效果达到47.7%,穗颈瘟的防治效果达到51.1%.     

不同活力红松种子的田间表现

对发芽能力分别为87％和92％的红松种子,进行了田间对比试验和生理测定。结果表明,高活力种子具有较高的发芽率、出苗率和保苗率,其出苗过程迅速而整齐,光合作用功能叶的叶录素含量较高,根系活力强,苗木生长健壮,具有较强的适应能力。