尖峰岭地区荔枝栽培及区划设想

尖峰岭地区是我省的主要荔枝产区，有着几十年的栽培历史。近几年荔枝生产得以较大发展，但由于对栽培品种的生产发育与区域分布等问题了解欠缺，栽培品种较杂，没有形成主要生产品种，影响了本区荔枝生产的健康发展。为此特对本地区荔枝栽培作了调研，基本掌握了本区荔枝栽培品种的生长发育表现，对荔枝生产区域化问题有了较深认识，形成了尖峰岭地区荔枝栽培类型及区域布局的初步意见，同时分析了本区当前荔枝生产中存在的主要问题，提出了今后荔枝生产的初步意见和建议，为指导本区荔枝生产提供理论依据。     

Cadmium and lead in human body fluids,air and drinking water in the area of Cracow

The amount of Cd and Pb in full blood and in the urine of males in Cracow and in a control area were measured and compared to the background of the level of these metals in air, dust fall and drinking water. The investigations were carried out in the years 1984–85. The mean Cd level in body fluids of Cracow's inhabitants was significantly higher than in the control group, and it amounted to: 0.54 μg Cd 100 mL^?1 in blood and 2.13 μg Cd L^?1 in urine. The Pb content in blood of the Cracow group (15.74 μg 100 mL^?1) was also significantly higher than in the control one, while the Pb level in urine was similar in both populations, reaching values below 10 μg L^?1. The mean annual Cd concentration in air and the Cd content in the dust fall in Cracow were 3 times higher than in the control area. The mean annual Pb concentration in Cracow's air exceeded the permissible Polish norm. In comparison with the control area, the Pb concentration level in air and its content in the dust fall in Cracow were 5 and 2 times higher, respectively. The level of Cd and Pb concentration in drinking water in Cracow and in the control area were much lower than the permissible values; however, in Cracow they were somewhat higher than in the control area.     

市场经济条件下国有林场扭亏增盈初探

国有林场扭亏增盈必须在人事、劳动、分配等制度上进行改革，生产与市场、科技与市场要有机结合，高素质的经营管理者队伍建设是扭亏增盈的关键。     

籼粳杂种亚优2号的遗传结构和连锁效应分析

应用三重测交99个家系和P₁、P₂、F₁、F₂、B₁和B₂世代,研究籼粳杂种亚优2号的遗传特征.结果表明:①单株产量和株高在F₁代有突出的超亲优势,优势率分别为103.34%和28.61%.单株产量的超亲优势主要由显性效应引起,加性×加性的上位性效应也不可忽视.②加性、显性和上位性效应在株高中同时存在;单株产量受显性和加性×加性效应控制;每株穗数仅显性效应达极显着;出穗期,每穗粒数和500粒重符合加性遗传.亚优2号的加性和显性效应是重要的,上位效应仅在株高和单株产量中存在.③连锁效应检测显示,株高和单株产量可能具有连锁效应和连锁上位性基因.     

Cropping System Intensification as a Management Method Against Vectors of Viruses Causing Maize Lethal Necrosis Disease in Kenya

Maize Lethal Necrosis Disease (MLND) has emerged as a great threat to maize production in East Africa. It is caused by a synergistic infection of maize by sugarcane mosaic virus (SCMV) and maize chlorotic mottle virus (MCMV). This study was carried out in Bomet County, Kenya, to determine the potential of various cropping systems to manage vectors of MLND–causing viruses. Plots measuring 7.5 m × 5.25 m were planted with maize (Zea mays L.) intercropped or bordered by elephant grass (Pennisetum purpureum Schumach.), coriander (Coriandrum sativum L.), pearl millet (Pennisetum glaucum (L.) R. Br.) and Gadam sorghum (Sorghum bicolour (L.) Moench). Maize monoculture was used as a control treatment; the nine treatments were arranged in a randomized complete block design and replicated four times for two seasons (December 2014 to April 2015 and April 2015 to September 2015). Data on corn thrips and corn leaf aphid infestation, MLND severity and incidence, MCMV and SCMV viral load, and yield were recorded. The sorghum border was the only companion crop that tested positive for MCMV and none tested positive for SCMV. Maize intercropped with elephant grass had significantly (P?<?0.01) the least incidence of disease. However, this treatment produced significantly lower yields (P?<?0.01). Coriander was the only companion plant most preferred by both corn thrips and corn leaf aphids (P?<?0.001). Maize from all cropping systems tested positive for MCMV (P?<?0.001) while maize grown with coriander tested negative for SCMV (P?<?0.001). Yields from plots surrounded by sorghum and coriander were significantly similar to those from maize monoculture plots. These findings suggest that maize should be intercropped with coriander due to its potential to trap corn leaf aphids and protect maize from SCMV. In addition maize should be grown surrounded by a sorghum border to maximize yield in areas where MLND is prevalent.     

Varroa mites,viruses and bacteria incidences in Kenyan domesticated honeybee colonies

Varroa mite (Varroa destructor Anderson and Trueman) is a major global threat to the western honey bee (Apis mellifera L.). The ectoparasite has been implicated in the spread of honeybee viruses. Beekeeping plays a major role in transmission of the mite. The study aimed at assessing levels of Varroa infestation, bee viruses and bacteria incidences in domesticated honeybee colonies. Samples of adult honey bees, bee brood and Varroa mites were collected from Baringo, Narok, Kwale, Magarini, Voi, Ijara, Busia and Siaya in Kenya. Ten hives in each site were inspected for the presence of Varroa mites on adult bees using the icing sugar technique and forceps in sealed brood cells. The number of mites observed were recorded per site. Ribonucleic acid was extracted from the mites, brood and adult bees and a polymerase chain reaction was performed to detect the black queen cell virus. Pooled RNA samples of brood and adult bees were used in next generation sequencing on a 454 GS FLX platform to detect bee viruses and bacteria. Varroa mites were reported in all the study sites at varying levels. The black queen cell virus and three iflaviruses, European foul brood and its secondary causative agent Enterococcus faecalis were reported. The Kenyan honeybee population is threatened by bee pests and pathogens. There is a need for constant monitoring of bee pests and diseases in honeybee colonies in the country for early detection and to provide data on the status of bee health. All stakeholders in the beekeeping value chain should be enlightened on their role in pest and disease transmission.     

False codling moth,Thaumatotibia leucotreta (Meyrick) a new threat to horticulture industry: Stakeholders’ perspectives on the status,impact and management in Kenya

Journal of Plant Diseases and Protection - False codling moth (FCM) has emerged as a major constraint to the production of horticultural crops in Kenya and is currently the leading cause of...     

短萼仪花种子育苗技术

短萼仪花是华南地区极具开发潜力的乡土园林树种。文章探讨剪口、硫酸浸种和沸水浸种3种方法进行硬实处理后对种子发芽特性的影响,优化育苗技术,并对短萼仪花苗期的水肥管理和病虫鼠害防治技术进行了总结,为今后短萼仪花的种子育苗与繁育提供技术指导。     

生物谱辐照对种子萌发及幼苗生长过程中某些生理生化特性的影响

采用生物谱以红外为主能量区的宽谱电磁波装置，对多种农作物种子进行辐照，依据种子品种及其粒形大小和是否带有紧韧外壳等确定辐照时间，温度，距离等处理参数，并以不辐照种子为对照，研究对种子萌发，幼苗生长及其代谢的影响，取得了初步结果。     

30个旱稻品种的主要农艺性状与相关分析

利用SAS等软件对30个旱稻品种的千粒重、株高、单株有效穗数等10个主要农艺性状进行了遗传力、遗传进度、相关系数等参数的分析，特别是进行了性状间的通径分析。结果表明：单株粒数、千粒重、结实率对旱稻单株产量的提高是至关重要的，而穗长、主茎杆粗、单株有效穗数对单株产量作用不大，甚至会出现负相关作用。因此认为，通过对单株粒数、千粒重、结实率的选择，有助于旱稻的培育，加强灌浆期的管理可以有效提高单株产量。