新余市马尾松毛虫的发生及防治对策     

李向东  李国纯 《江苏林业科技》1996,23(3):56-59

报道了马尾松毛虫在新余市历年来的发生情况及生活史，探讨了该虫的发生原因，根据该市实际情况总结并提出了综防对策。  相似文献   

毛竹笋芽和竹笋生长规律   总被引：7，自引：0，他引：7  

陈建华  何正安 《经济林研究》1992,10(2):46-49

经过7年的试验研究,掌握了毛竹笋芽和竹笋生长的一些自然规律,对发展生产具有重要意义。  相似文献   

黑龙江省森工林区有关林木采伐问题的探讨     

周业居  蔡晓达 《林业勘查设计》2007,(1):17-18

从多角度论述了当前林木采伐管理工作中存在的问题。  相似文献   

武夷山土壤酶活性垂直分布与土壤肥力关系的研究   总被引：4，自引：0，他引：4  

杨式雄  陈宗献 《福建林业科技》1993,20(1):1-7

本文通过对武夷山土壤酶活性的研究表明:武夷山土壤养分随着海拔高度的升高而升高;其各种土壤酶活性亦随海拔高度的升高而提高;同一土类各种土壤酶活性基本上呈现上层高、下层低的层次性分布;各种土壤酶活性水平与各土类养分的化学性状呈现显著的正相关。  相似文献   

钾肥施用量对中牟大白蒜产量及品质影响     

梅四卫  贾云超  宋巧玲  朱涵珍  程聚强  梅望玲 《广西农业生物科学》2010,(1):115-119

本实验从2006～2008年连续3年在中牟对大蒜钾肥施用技术进行多点研究。结果表明,以施用钾肥为中心的平衡施肥可大幅度提高大蒜的产量和品质,蒜苗、蒜苔和蒜头3年平均产量较不施钾肥的对照分别提高11.1%～30.8%、10.5%～44.7%和9.0%～27.7%。增施钾肥能有效提高蒜苗和蒜苔中维生素C及可溶性糖分含量,改善大蒜的内在品质,提高大蒜的营养价值,经济收益增加2133～7179元/hm2,施用钾肥的产投比达6.1：1～11.8：1。在当前产量和生产水平下,大蒜平衡施肥方案为：纯N300kg/hm2,P2O580kg/hm2,K2O300kg/hm2左右。本文将对指导大蒜合理施肥,优质高效生产具有积极的作用。  相似文献   

峨眉千里光甲醇提取物杀虫、抑菌及抑制种子萌发活性的初步研究     

刘琦  王学贵  田孟良  李文光  沈丽淘  吴少英 《农药科学与管理》2012,33(9):15-19

本文研究了峨眉千里光甲醇提取物的杀虫、抑菌及抑制种子萌发的活性。结果表明,对甲醇提取物进一步萃取后,氯仿、乙酸乙酯及正丁醇萃取物表现出很强的杀虫、抑菌及抑制种子萌发活性,其中对桃蚜24h的LC50值在0.119~0.414mg/mL之间,对番茄灰霉病菌72h的EC50值在5.956~9.416mg/mL之间。因此,峨眉千里光甲醇提取物的氯仿和乙酸乙酯萃取物的杀虫、抑菌活性成分值得进一步深入研究。  相似文献   

Characterization of larval instars of artemisia weevil,Adosomus sp.     

WANG Jian-wei  LUO You-qing  ZONG Shi-xiang  GAO Bi-qiang  LI Yue-huaKey Laboratory for Silviculture  Conservation of Ministry of Education  Beijing Forestry University  Beijing  P.R.China Forest Pest Control  Quarantine Station of Yanchi County  Ningxia Province  Yanchi  P.R.China 《中国林学(英文版)》2009,(1)

The artemisia weevil,Adosomus sp.,has become an important wormwood(Artemisia ordosoca and A.sphaerocephala) pest in recent years in Ningxia Province,China.The number of larval instars should be determined before further studies on its life history,biology and integrate management of pest(IMP).In this study,we measured the length and width of head capsule,based on frequency histograms and Dyar's law,from which we concluded that the larvae of Adosomus sp.have four instars.Of the two vari-ables measured,the wi...  相似文献   

中美小麦矮腥黑穗病菌鉴定合作研究 Ⅰ.自发荧光显微学特性研究   总被引：5，自引：0，他引：5  

章正  王圆  姚文国  曲能治  张翠蓉  吴莘喁  彭金火  周国梁 《植物病理学报》1995,(3)

中美双方为探讨适用于进口粮检疫的小麦矮腥黑穗病菌(Tilletia controversa Kuehn,以下简称TCK)准确简便的鉴定方法,于1989～1992年进行联合试验。本文以美国不同时期和不同地域所收集的小麦矮腥黑穗病菌(TCK)和小麦网腥黑穗病菌(T.caries Tul.,以下简称TCT)共135个菌株为材料,对这两种病菌的自发荧光显微学特性,作了比较研究,建立了数学模型,并在人工污染样品中进行了应用研究,结果表明,自发荧光显微学法和LI-F方程,可以有效地鉴别TCK或TCT菌株,但如应用于鉴别进口粮中混合的或少量的TCK、TCT冬孢子,则其准确率随孢子含量的下降而降低。  相似文献   

中美小麦矮腥黑穗病菌鉴定合作研究 Ⅱ.比较形态学研究   总被引：5，自引：0，他引：5  

章正  王圆  姚文国  曲能治  张翠蓉  吴莘喁  彭金火  周国梁 《植物病理学报》1995,(3)

对美国135个小麦矮腥黑穗病菌(Tilletia controversa Kuehn,以下简称TCK)及小麦网腥黑穗病菌(T.caries Tul.以下简称TCT)进行的比较形态学研究表明,网脊高度最具有鉴别意义。在中美双方所测的近万个数据中,TCK与TCT菌株的平均网脊高度值很少交叉,两个种在网脊高度上的区别具有种间的规律性和鉴别性。经人工污染样品及市场样品对各种模型的检测证明,根据逻辑方程推导出的临界网脊值可用于市场样品检验中对TCK的判别和鉴定,从而为准确、快速地鉴定进口粮中少量的或混合的TCK、TCT冬孢子提供了新途径。  相似文献   

Comparing efficiency of metabolizable energy utilization by rainbow trout (Oncorhynchus mykiss) and Atlantic salmon (Salmo salar) using factorial and multivariate approaches     

Azevedo PA  van Milgen J  Leeson S  Bureau DP 《Journal of animal science》2005,83(4):842-851

A study was conducted to compare utilization of ME for growth vs. maintenance in rainbow trout and Atlantic salmon. Fish were hand-fed to satiation one of four isoenergetic diets (DE = 20 MJ/kg, as-fed basis) with different digestible protein (DP) to DE ratios (24, 22, 20, and 18 g/MJ). Intake of ME (kJ/d), energy deposited as protein (PD, kJ/d), and energy deposited as lipid (LD, kJ/d) were determined by a comparative slaughter technique. Data were analyzed by a factorial approach or by multivariate analysis of PD and LD on ME. Maintenance energy requirements (ME(m)) and efficiency of ME utilization for PD (k(p)) and LD (k(f)) were estimated with both approaches. For the multivariate analysis, an additional parameter, the fraction of ME intake above maintenance used for PD (X) was defined as linear function of BW, with slope (d) and intercept (c) estimated simultaneously with the above parameters. Estimates were highly dependent on the approach and assumptions used. The ME(m) and k(p) values were higher and less accurate with the factorial approach than with multivariate analysis. The factorial approach estimated unrealistic k(f) values (k(f) > 1). With the multivariate analysis, ME(m) did not differ between species (20 kJ x d(-1) x kg(-0.8)). On the other hand, k(p) was significantly higher (e.g., 0.52 +/- 0.06 vs. 0.43 +/- 0.06; P < 0.05) for salmon than for trout and independent of diet, but k(f) was 0.81 (+/-0.13) regardless of species or diet. The ME intake above ME(m) used for PD (c) was higher in salmon than trout (57 vs. 55%; P < 0.05). The change in partitioning of ME for PD due to the change in BW was negative for trout (d = -0.18), but positive for salmon (d = 0.16). The d values agreed well with the increase of LD:PD ratio with BW for trout and the decrease of LD:PD with BW for salmon, which may have been related to the maturation status of this fish and the associated loss of body lipid observed by maturing salmon. In conclusion, ME(m) and cost of LD were similar for rainbow trout and Atlantic salmon, but the cost of PD was lower for salmon than for trout.  相似文献