不同培养基对小麦纹枯病菌生长繁殖及致病力的影响

采用不同的培养基培养小麦纹枯病病菌,结果表明:在改良的PDA培养基、PDA培养基 小麦叶汁培养基、V8培养基和番茄培养基上培养的病原菌比在其他的培养基上培养的病菌菌丝生长速度快,且其对3种小麦品种的致病力较其他培养基上的病菌强,因此可用这四种培养基复壮、保存小麦纹枯病病菌。     

不同煤基腐殖酸对土壤锌淋洗效果的研究

为了研究不同煤基腐殖酸对土壤锌的淋洗效果,从而进一步探讨其调控土壤锌移动性的效果,采用土柱淋洗方法,研究了11种煤基腐殖酸及EDTA在2种淋洗方式（去离子水淋洗和5% KCl溶液淋洗）下对土壤Zn的淋洗效果的影响。结果表明：11种煤基腐殖酸处理下,去离子水淋洗液中Zn含量与CK2相比,1~10号煤基腐殖酸对土壤Zn都有一定的钝化作用,降低了Zn在土壤中的迁移性,而11号煤基腐殖酸增强了Zn在土壤中的迁移性,但11种煤基腐殖酸处理下的淋洗效果均低于EDTA处理下的淋洗效果。同时,5% KCl溶液对Zn的淋洗效果好于去离子水。     

杨树抗硫新品种‘普瑞’

‘普瑞’是从欧美107杨速生丰产林中自然选择得到的,除具有普通107杨的生长习性外,还具有抗二氧化硫有毒气体的特性,适宜种植在华北、长江以南酸雨地区,以及高二氧化硫污染区。     

红锥天然分布区的主要资源现状

文章在调查分析红锥17个主要分布区的现有资源状况的基础上,重点比较了现有资源的生长特性以及与气候立地的关联性。     

陕西关中东部棉花抗旱品种农艺节水综合技术研究

按照生态农业理论和抗旱节水技术要求,对棉花抗旱品种、不同密度、不同基肥N、P的施用量进行田间综合试验,采用正交设计法。3年试验研究结果表明:密度以每公顷种植7.5万株比4.5万株、6万株平均增产671.85kg、483.30kg,增产57.49%和41.36%。品种陕402(早熟)、陕576(中早熟)分别比中棉所19(中熟)增产16.62%和16.17%,具有较强抗旱性。磷酸二铵比尿素增产作用明显,每公顷施150、225kg分别增产11.35%和10.53%。     

桑树TrnL-trnF基因间隔区序列的特点及分析

设计桑树TrnL trnF基因间隔区序列的特异引物 ,扩增并分析了桑属育 71 1和桑莲 2个品种的TrnL trnF基因间隔区序列 ,其长度分别为 4 14bp和 4 17bp ,且富含A/T。该序列有 4 2 1个分析性状 ,具有 17个变异位点。在这些变异中主要以碱基的插入和缺失 (主要是插入 /缺失dA)为进化形式 ,其余的发生了少数置换。除这些变异位点以外的核苷酸序列完全相同 ,说明两者有高度同源性 ,与桑科、菊科和蔷薇科的TrnL trnF基因间隔区序列有一定同源性。用Clustalx软件对 2 1份材料的TrnL trnF基因间隔区序列进行聚类分析 ,建立了系统进化发育树     

Effects of Chinese herbal formula Heat-stress-releasing on antioxidant function in dairy cows

In order to investigate the effects of a Chinese herbal formula Heat-stress-releasing on the antioxidant function in dairy cows, ten dairy cows were randomly divided into the control group and the experimental group, with five cows in each group. All the cows were fed with a basal diet. The animals in the experimental group were given with 220 g of herbs per day in addition to the basal diet. The trial was conducted for 14 days. Blood samples were taken from the vena cava at day 0, day 7, and day 15, respectively. The antioxidant statuses were examined. The results are as follows. (1) Heat-Stress-releasing formula can significantly increase the milk yield of dairy cows under heat stress. Compared with the control group, the milk yield of the herb-treated group increased by 14.01% (P<0.05), 14.32% (P<0.05) and 15.01% (P<0.05) in prophase, metaphase and anaphase of the test, respectively. (2) Heat-Stress-releasing formula can increase significantly the antioxidant status of the heat stressed dairy cows. Compared with the control group, the superoxide dismutase (SOD) activity increased by 45.93% (P<0.01) at day 7 and by 54.40% (P<0.01) at day 15. The Glutathioneperoxidase (GSH-PX) activity of the test group increased by 17.99% (P<0.05) at day 7 and 25.98% (P<0.01) at day 15. The total antioxidant capacity (T-AOC) of the test group increased by 43.64% (P<0.01) at day 7 and 46.35% (P<0.01) at day 15. The malondaldehyd (MDA) content of test group declined by 23.88% (P<0.01) at day 7 and 25.32% (P<0.01) at day 15.     

兴隆林业局木材缴库、存储、销售计算机管理系统开发模型

从管理层次、数据流、工作界面、功能模块、系统安全性等几个方面对兴隆林业局木材缴库、存储、销售计算机管理系统的开发模型进行了详细的分析。     

Evaluating the navigation performance of multi-information integration based on low-end inertial sensors for precision agriculture

The main objective of this research was to evaluate the navigation performance of multi-information integration based on a low-end inertial measurement unit (IMU) in precision agriculture by utilizing different auxiliary information (i.e., GNSS real-time kinematic (RTK), non-holonomic constraints (NHC) and dual antenna GNSS). A series of experiments with different operation scenes (e.g., open sky in wet and dry soils) were carried out for quantitative analysis. For the position drift error during a 20-s GNSS outage, the dual-antenna GNSS-assisted approach did not provide a reduction, and the NHC reduced the maximum error in the lateral and vertical directions by over 80% in the dry soil test, but only by approximately 30% in the wet soil test. The heading error with continuous GNSS assistance can be less than 0.03° and be reduced by more than 90% with the aid of dual-antenna GNSS. Additionally, the NHC reduced the heading error from 0.54° to 0.21° and from 0.34° to 0.25° in the dry and wet soil tests respectively. The results suggested that the multi-information integration improved the positioning and orientation reliability. Moreover, the lateral positioning accuracy required for the control of agriculture autonomous vehicles was achieved at approximately 3.0 mm with over a 60% accuracy improvement brought by the dual-antenna GNSS assistance. In contrast to the vulnerability of a single system, multi-information integration can provide comprehensive navigation information with higher reliability and lower costs. Hence, multi-information fusion will be a great opportunity for agriculture to meet the high-accuracy and high-reliability requirements of precision agriculture.

     

毛白杨优树快速繁殖方法的研究

在林木无性系育种中,作为成年优树的无性繁殖方法,不仅要求能繁殖出众多的无性系分株,满足无性系测定的需要,而且还要求所繁殖出的苗木,能解除成年大树的老化,恢复幼态,克服枝条的位置效应,消除不同母树的年龄差别,使优树无性系测定的试材,具有幼年性、一致性和可比性的共同基础。本文系统地阐述了对940株毛白杨优树进行挖根、人工促萌、根出条嫩枝扦插的快速繁殖方法及其应用的效果。同时对其中所涉及的10个试验因子,都一一作了分析与讨论。