共查询到16条相似文献,搜索用时 78 毫秒
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2000―2020年,使用佳多虫情测报灯对地老虎成虫种群动态进行了持续监测。结果表明,黄地老虎是当地最主要的地老虎类害虫,种群数量呈现增加的趋势,成虫优势度平均为51.11%;平均雌雄比为1∶0.93。各月黄地老虎蛾量比例在年份间变化较大,且不同月份的21年均值差别大,4月最低,8月最高。从始见日到越冬代高峰日的间隔时间平均为25.56 d;越冬代高峰日至第一代高峰日的间隔时间平均为48.00 d;第一代高峰日至第二代高峰日间隔时间平均为64.19 d;第二代高峰期至末见日的时间平均为30.75 d。 相似文献
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新疆阿拉尔滴灌棉田栽培技术 总被引:1,自引:0,他引:1
目前,滴灌棉田的栽培技术日趋成熟,农一师棉花产量比过去有较大幅度的提高。农一师棉花面积12万公顷,单产目标子棉每公顷6573kg。一些团场部分棉田每公顷子棉突破8250kg。究其高产原因,除了土壤肥力等基础条件好,还掌握了一些田间管理中的关键点,对产量提高起到了重要作用。 相似文献
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随着新疆棉花种植面积、栽培技术和耕作制度等方面的变化,棉田中杂草种类和群落在发生变化.杂草在长期的自然选择中形成了根系发达、生长速度快、繁殖能力强等特点,其传播途径多,生长周期长,抗逆性强,在农田中与作物争光、争水、争肥,已成为新疆棉花高产、优质、低耗、增效的一个制约因素. 相似文献
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利用飞机进行棉田作业,能有效地提高农业技术措施的时效性及到位率.飞机作业能避免机械对棉花的伤害,保证棉花正常生长. 相似文献
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Insects are strongly dependent on climatic factors, especially temperature. For this reason, changes in insect phenology are predicted to be one of the many effects of climate change. We analysed the effect of climate warming on Agrotis segetum (Denis & Schiffermüller) in Denmark. Agrotis segetum is an agricultural pest that causes root crop damage. Extensive registers of root crop damages by A. segetum in Denmark were kept between 1905 and 1980. These records show a correlation between A. segetum outbreaks and hot, dry summers. The last outbreak in Denmark, in 1976, prompted the implementation of pheromone trap monitoring. Data from these pheromone traps, for the periods between 1981–1991 and 1997–2009, show a decline in the number of A. segetum individuals during 2000–2009. We used this pheromone trapping data to test the hypothesis that temporal changes in phenology and abundance are correlated with temperature and precipitation patterns. As phenological fixed points, we use the time of capture (first, 10%, 50%, 90% and last) of 1st generation A. segetum together with the 10%–90% capture period and the total capture per location for a statistical comparison of the period 1981–1990 versus 2000–2009. We also analysed the effect of temperature on the timing of fixed points and the effect of precipitation on the mean total capture from the summer and the preceding winter. Our analyses showed an earlier occurrence of A. segetum during 2000–2009 than during 1981–1990: all phenological fixed points advanced by 6–9 days. Trap captures of the 1st generation roughly halved from the 1981–1990 decade to the 2000–2009 decade, and a much larger 2nd generation of moths developed in the latest decade. When a second generation occurs, populations in following years decrease because the larval offspring of the 2nd generation cannot successfully overwinter. Our analyses further indicated that increased precipitation during the summers and mild winters contributed to an overall decline in the populations of this pest. The presence of A. segetum remains sufficient to be a potential threat to yields. Forecasting an economically important attack of A. segetum is challenging because of the early emergence of A. segetum and more variable local weather conditions than 20 years ago; forecasting relies on the timely and correct delivery of monitoring results. Farmers are a vital source of information for monitoring, for estimating control requests and for timing the emergence of A. segtum. However, the growing frequency of no-risk forecasts has reduced the interest and lowered the motivation of farmers to participate in monitoring programs. 相似文献
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依据2020年5月初在新疆阿拉尔垦区机采棉田观察到的地老虎危害棉花幼苗现象,于5月上旬至6月上旬开展了隔日定点跟踪观测和走访调查,并结合农业气象指标,分析了当年地老虎危害偏重发生的原因。结果显示:2020年阿拉尔垦区苗期棉田地老虎偏重发生主要与2019年的暖冬,2020年3月上旬至6月上旬的气温偏高、沙尘天偏多、光照不足,以及田间防治不及时等有关。针对实际情况提出棉田地老虎发生的综合防治措施,为今后当地农业部门指导棉田地老虎防治提供依据。 相似文献
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通过分析麦盖提垦区2010-2016年气象因素和棉花产量构成因子,并对气象因素和产量构成因子进行相关性分析,探讨了近7年内麦盖提垦区气象因素对棉花产量构成的影响。结果表明:气象因素对棉花产量构成因子有不同程度的影响,其中对单株成铃和皮棉产量的影响较大,对铃重和衣分的影响较小。温度是影响棉花产量构成的重要气象因素,其次是降水量。月平均气温对棉花单株成铃和皮棉产量均有较大影响,6月平均气温越高单株成铃越多、皮棉产量越高;7-8月≥20℃活动积温越高单株成铃越少、皮棉产量越低,9月平均气温越高单株成铃越多、皮棉产量越高;全生育期≥20℃活动积温越高单株成铃越多、皮棉产量越高。月降水量对棉花单株成铃有较大影响,其中7月降水量越多单株成铃越少。 相似文献
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2020年于新疆奎屯垦区试种了4个棉花杂交F2材料(中棉所86 F2、QS杂-16 F2、鲁棉研24号F2和鑫瑞819 F2)和2个常规棉品种(惠远720和新陆早61号),以单株为单位进行纤维品质一致性分析。结果表明,各杂交F2纤维上半部平均长度、长度整齐度指数、断裂伸长率的变异系数相对较小;马克隆值、断裂比强度、短纤维率3项指标的变异系数相对较大。常规种纤维品质更能保持较好的一致性;杂交F2更易表现出1项或数项纤维品质指标变异系数较大的现象。鑫瑞819 F2与对照惠远720及其他杂交F2相比纤维品质相对一致,这说明可筛选出各项纤维品质指标较整齐的甚至某些纤维品质指标一致性优于常规种的棉花杂交F2用于大田生产。 相似文献