包装玉米长期安全储藏试验   总被引：1，自引：0，他引：1  

曹景华  林镇清  于文江  祁正亚  黎洪真  冷逸林 《粮食储藏》2005,34(2):28-31

在华南地区高温高湿环境下，在尚不具备机械通风设备的楼房仓内进行玉米包装大堆保管。采用合理的剂量和熏蒸方法，保持粮堆内较长时间的PH3有效浓度，抑制了玉米的呼吸强度和微生物、害虫的生长繁殖，确保了玉米长期安全储藏，保持了较好的储粮品质。  相似文献   

高炮电气随动系统神经智能故障诊断系统的设计与实现     

谢宏  何怡刚  吴杰 《湖南农业大学学报(自然科学版)》2001,28(6)

根据高炮电气随动电控系统的组成及其电路的结构与特点，设计了高炮电气随动系统神经智能故障诊断系统的模型、系统硬件组成、系统软件结构和相关命令，并阐述了拟神经网络测试算法。  相似文献   

东北地区主要食物维生素E含量的分析及其评价     

蔡建岩  韩福芹 《吉林粮食高等专科学校学报》2002,17(1):8-13

采和高效液相色谱法分析了东北地区在一百四十多种食物中维生素E的容量，并对其结果进行分析、归纳和总结，从而为制定新的食物成分表提供了科学依据。  相似文献   

N₂O-Freisetzung auf gemähtem Dauergrünland in Abhängigkeit von Standort und N-Düngung     

Ch. Hoffmann  M. Anger  & W. Kühbauch 《Journal of Agronomy and Crop Science》2001,187(3):153-159

N₂O Emissions from True Meadows Dependent on Location and N Fertilization Agricultural production is thought to be a main anthropogenic emitter of nitrous oxide (N₂O), which contributes to global warming and the destruction of the ozone layer. There is still considerable uncertainty about the amount of N₂O emission, and the site‐specific parameters that affect N₂O emission. From October 1995 until March 1998 experiments were conducted at established field plots (true meadows) at three different sites, i.e. low mountain range (Eifel), lowland (Niederrhein), and moist meadows (Münsterland). Plots were fertilized with calcium ammonium nitrate (CAN) at nitrogen equivalents ranging from 0 to 360 kg N ha^–1. N₂O fluxes were measured throughout the whole year using the closed‐chamber method. In addition, data on temperature, water‐filled pore space and precipitation were collected. N₂O emission rates (mg N₂O‐N ha^–1 h^–1) were highest either after fertilizer application or in winter during frost, depending on the experimental site and N dosage. The annual amount of N losses due to N₂O emission was dependent on the experimental site and the type and dosage of fertilizer. Disregarding the 360 kg N ha^–1 level of the CAN treatments, the N losses in this experiment were less than 1.5 kg N₂O‐N ha^–1 yr^–1. At low fertilizer dosage there was no reliable correlation between the amount of N that was applied and the amount of N₂O that was emitted. However, with high fertilizer levels the N₂O emissions increased gradually. Finally, N₂O emissions were more influenced by the amount of CAN than by the site.  相似文献   

钢筋混凝土约束梁斜向贴CFRP抗剪加固研究     

尚守平  王海东  童桦  杨建西  单远铭 《湖南农业大学学报(自然科学版)》2002,29(3)

通过对 1 2根承受集中荷载作用下破坏后补好的矩形截面钢筋混凝土约束梁斜向贴 CFRP抗剪加固试验结果的分析 ,提出了 CFRP有效应变的概念 ,得出了随角度变化 CFRP抗剪承载力计算公式  相似文献   

湿地松种子园疏伐试验研究     

刘务山 《湖南林业科技》2002,29(4):31-33

根据子代测定结果和当代表现等因子对湿地松种子园进行疏伐，使种子园的结实量显著增加，结实株百分率其强度疏伐的为62%，中度疏伐的为39%，轻度疏伐的为28%，不疏伐的为22%；单株种子产量的比例为不疏伐；轻度伐；中度伐；强度伐=100：120：200：400，不疏伐的为22%；单株种子产量的比值为不疏伐；轻度伐：中度伐：强度伐=100：120：200：400；亩均种子产量的比例为不疏伐；轻度伐；中度伐；强度伐=100：119：208：411，当种子园进入结实盛期时，每亩保留8-10株是合理的，如果无性系的营养生长和生殖生长能力特别强，每亩保留6-8株即可。  相似文献   

平湖剑子麦、洪湖大太宝、崇阳红麦、延岗坊主、万年2号抗赤霉病性基因分析   总被引：1，自引：0，他引：1  

余毓君 《作物学报》1991,17(4):248-254

本试验将抗性组分分析法与单体分析法相结合,进行了小麦抗性基因染色体定位和抗性评价。结果表明,平湖剑子麦是抗性较稳定的中抗至抗病品种,其抗性基因涉及6D、7A、3B、5B和6B 等染色体。洪湖大太宝抗性基因和感病基因并存,是一个中抗偏感或中感品种。崇阳红麦属感病品种。延岗坊主的抗性基因位于染色体3A 上,感病基因位于5D 上,是一个中抗品种.万年2号麦穗前期抗病基因位于4D 和5A 上,是中抗品种。两种方法结合研究多基因控制的赤霉病抗性,能获得比较准确的结果和较多的遗传信息。  相似文献   

农用车辆前轮定位失准的原因浅析及预防     

杨明  路琴  王德明 《中国农机化》2003,(6):57-58

针对农用车辆前轮定位失准的原因作出分析，并提出预防前轮定位失准的有效措施。  相似文献   

A procedure for combining a quantitative inheritance study with the first cycle of a breeding program     

M. J. Bassett  F. E. Woods 《Euphytica》1978,27(1):295-303

Summary The number of effective factors controlling the inheritance of a quantitative character can be estimated by analysis of F₃ lines where the parental lines are homozygous. The procedure is illustrated with data from a study of pod length inheritance in common bean (Phaseolus vulgaris L.). The mean pod length of Sprite, the parent with longer pods, was compared statistically with the means of F₃ progenies derived from F₂ plants obtained from the appropriate tail of the F₂ frequency distribution for pod length. The data indicate that analysis of F₃ progenies avoids much of the underestimation of the effective factor number which is characteristic of other procedures. The number of effective factors was estimated to be a minimum of 4 and the correlation between random F₂ parents and F₃ progeny means was r=0.82.Florida Agricultural Experiment Station Journal Series No. 406.  相似文献   

Investigations on resistance of oats to Heterodera avenae: Location of resistance genes     

B. H. Chew  R. Cook  H. Thomas 《Euphytica》1981,30(3):669-673

Summary By using 15 available mono/nullisomic lines of Sun II back ground, the Heterodera avenae resistance gene in Nelson (from Avena sativa CI 3444) and Panema (from A. sterilis I. 376) were located on monosome XV. Genes with smaller effects were located on monosomes VIII and X. The absence of these genes derived from Sun II would increase cyst production on plants lacking major resistance genes.  相似文献