A COMPARISON OF METHODS OF RECORDING HERBACEOUS WEEDS IN WEED CONTROL EXPERIMENTS     

P. RIEPMA  WONG PHUI WENG 《Weed Research》1963,3(1):26-34

Summary. In herbicide studies close correlation between results given by the square quadrat method and by a point quadrat method for assessing the number and frequency of weed species was found. Marked correlations between the density obtained by the square quadrat and the cover and yield indices obtained by the point quadrat method were observed.
Treatment discrimination using the point quadrat was as good as that obtained with the square quadrat and it is concluded that the point quadrat method is suitable for assessing weed control in low-growing vegetation.
Comparaison de méthodes de notation des mauvaises herbes herbacées dans les essais de désherbage  相似文献   

Effect of Ratio of Face to Core Particles on Mechanical and Physical Properties of Particleboard Manufactured from Ethiopian Highland Bamboo     

SEYOUM Kelemwork PARIDAH Md.Tahi WONG Ee Ding RAHIM Sudin 《中国林业科技(英文版)》2009,(1)

The study was conducted to evaluate effect of ratio of face to core particles on mechanical and physical properties of oriented strand board produced from Ethiopian highland bamboo.Three-layered oriented particleboards were manufactured with 4 proportions of face to core particles at 750 kg/m~3 target density.Ten percent urea formaldehyde resin was used as a binder.Strength and dimensional stability performances of all boards were assessed based on ISO standards.The results showed that modulus of rupture...  相似文献   

Efficacy of permethrin in controlling the Australian paralysis tick Ixodes holocyclus and the cat flea Ctenocephalides felis on dogs     

BF STONE  MA SHIPSTONE  KV MASON  M. CUNNINGHAM  CW WONG 《Australian veterinary journal》1994,71(3):90-91

  相似文献   

Kikuyu poisoning of cattle in New South Wales and its relationship to pasture fungi on kikuyu grass (Pennisetum clandestinum)   总被引：1，自引：0，他引：1  

P T W WONG  I J ROTH †  A R B JACKSON ‡ 《Australian veterinary journal》1987,64(8):229-232

In the late summer and autumn of 1980 kikuyu poisoning of cattle was diagnosed on 9 farms in New South Wales resulting in 213 deaths among 1370 cattle at risk. Clinical, autopsy and histopathological findings are described and are consistent with those previously recorded. Kikuyu grass samples from 5 paddocks in which deaths were occurring were examined for the presence of fungi. Myrothecium spp were not present. Fusarium semitectum, F. moniliforme var subglutinans, Penicillium spp and a Phoma sp were the most common fungi isolated but with the exception of F. semitectum were not consistently present. F. semitectum was present in adjacent kikuyu grass paddocks in which deaths were not occurring. Two of the farms had army caterpillar (Mythimna convecta) infestations. Army caterpillar faeces present in these paddocks did not contain Myrothecium spp; the fungi present reflected the population present on the kikuyu grass. These findings do not suggest a mycotic cause for kikuyu poisoning.  相似文献   

猪粪堆肥化处理的物质变化及腐熟度评价   总被引：48，自引：0，他引：48  

黄国锋  吴启堂  孟庆强  黄焕忠 《华南农业大学学报》2002,23(3):1-4

研究了初始C／N（mC/mN)分别为29和16的2种不同条件对猪粪堆肥化处理的物质变化和腐熟度的影响，结果表明：水溶性有机C／N、固相C／N、水溶性有机碳及水溶性NH4^ -N浓度均随着堆肥化的进行而降低。种子发芽指数的评价结果表明：初始C／N为29时，猪粪经过49d的堆肥后达到成熟，而C／N为16的处理则需要63d以上才能达到腐熟要求。过高的盐分含量是导致低C／N条件下堆肥产品植物毒性较高的原因之一。考虑到堆肥腐熟度受多方面化学因素的影响，建议以种子发芽指数作为有机固体废物堆肥腐熟度的评价指标。  相似文献   

河南大别山区野生草本花卉资源与合理利用   总被引：11，自引：2，他引：9  

杨好伟  翁海波  叶永忠  林海  袁志良 《河南农业大学学报》2000,34(2):130-133

在调查研究的基础上,介绍了河南大别山区的植物资源,列举了２７个科有较大观赏价值的野生草本花卉１００种,并对其开发、利用、保护及引种驯化提出了建议。  相似文献