甜叶菊种传病害防治方法的研究

采用种子处理方法可显著提高种子发芽率、降低发病率；其中以药剂浸种效果最好；药剂处理以多菌灵＋福美双和多菌灵两个配方最佳。     

Analysis of Growth and Productivity of Indian Mustard (Brassica juncea) in Relation to FYM, Nitrogen and Source of Fertilizer

A field experiment was conducted during the winter seasons of 1992–93 and 1993–94 at Anand to study the effect of FYM, nitrogen and source of fertilizer on growth and yield of mustard [ Brassica juncea (L.) Czernj & Cosson]. The results showed significant variation in leaf area index (LAI), crop growth rate (CGR), dry matter production and seed yield. The direct effect of farmyard manure (FYM) was conspicuous in improving the growth of mustard. FYM application at 10 tonnes ha⁻¹ significantly increased the LAI, CGR and dry matter accumulation per plant at almost all the stages during first year study (1992–93) and in pooled analysis. Similarly, nitrogen application registered maximum LAI, CGR at 75 kg level and RGR and NAR at 50 kg level at almost all the during both years. Sulphur carrying source (Ammonium sulphate plus single super phosphate) increased all stages growth characters. Maximum dry matter accumulation per plant and seed yield were recorded with highest levels of FYM (20 tonnes ha⁻¹), N (75 kg ha⁻¹) and source having S. Seed yield was strongly associated with LAI and dry matter accumulation per plant at all the stages.     

Issues and Some Strategies of Sustainable Development of Black Soil Resources in Black Soil Zone in Northeast China

黑土资源是世界的稀缺资源,黑土带的水土流失、环境污染、土地流转、土地退化问题成为黑土资源可持续发展的障碍。根据实地调研结合资料,分析了东北黑土带土地资源可持续发展的主要问题;提出了黑土资源的可持续发展对策,即:加强农业发展规划;保护黑土区耕地,农耕技术上改进,加强农田基本建设等。     

学会改革与发展面临的问题及对策

随着社会主义经济体制的逐步完善,改革的不断深化和对外开放的进一步扩大,学会在组织体制、管理模式、运行机制和活动方式等方面,还不能完全适应社会主义市场经济的要求,在综合分析学会存在诸多问题以及面临激烈竞争和严峻挑战的基础上,针对农业学会目前现状,提出了对策,以及今后努力发展的方向。     

渠道水力最优断面的程序设计及绘图

利用ActiveX Automation技术将Visual BASIC与AutoCAD链接，实现了常用渠道的水力最优断面设计及绘图的自动化，可明显提高渠道设计及绘图的工作效率。     

川东鸭茅的生产试验研究

在影响川东鸭茅种子产量的诸多因素中，播种量和行距是主要因素之一。本试验采用的行距是30、60、90cm，10m^2小区的播种量分别为10、15、20g，进行2因子9处理3重复的生产试验。结果表明，组合A2B3的种子产量最高，达799g／10m^2,极显著高于其它组合。因此，建议种植川东鸭茅采用行距90cm、播种量0．67kg／667m^2。     

江西苎麻产业化发展的思考与探讨

本文分析了江西苎麻业的发展现状和机遇，指出了江西苎麻业所面临的各种挑战，并提出了相关发展对策。     

贵州省退耕还林与农村经济发展研究

通过对贵州省贞丰、桐梓、锦屏等若干县市林业生态建设监理、检查、造林实绩核查等工作的实践和研究，认为退耕还林工程与农村经济发展相结合，目前应加强以下工作：选择林业主导产业；林产业时间、空间的合理布局；树种、林种的结构优化；林业体制创新；实施相关配套工程。     

华北落叶松种子贮藏试验浅析

在三种库房里对五种不同含水率、两种包装的华北落叶松种子进行了60个月的贮藏试验。结果认为，含水率5．19／5～8．0％的落叶松种子可以在三种库房密封贮藏39个月。种子贮藏的最佳含水率为6．6％～8．0%，最佳的库房是冷库(0C～5C)。磨口瓶与布袋在冷库贮藏效果差异不明显；地下库不能用布袋贮藏；在普通常温库中磨口瓶比布袋能多贮藏12个～18个月。     

Annual sex hormonal profiles, gonad development and age determination of the Mekong giant catfish (Pangasianodon gigas, Chevey)

Annual sex hormonal profiles, gonad development and age determination of 18 (13–14 kg body weight) and three (145–226 kg body weight) Mekong giant catfish (MGC) (Pangasianodon gigas, Chevey) reared in earthen ponds in Chiang Mai and from the Mekong River in Chiang Rai, Thailand, respectively, were investigated. The hormonal profiles were determined from blood samples of the fish by electrochemiluminescence immunoassay during May to August in 2000. The highest testosterone levels of 0.06 ng mL^?1 in both sexes and the highest oestradiol of 47.8 and 14.23 pg mL^?1 in females and males, respectively, were observed in May. The gonadosomatic index was found to be 0.07 for males and 0.38 for females from ponds in comparison with 2.27 for males and 8.29 for females from the Mekong River. Higher development stages of spermatocytes and oocytes of the cultured fish in May than in February and November were demonstrated. No mature germ cells were obtained from either the males or females, indicating no sexual maturity. The average age of fish was determined from the annual rings of the cross‐section of the pectoral fins by a stereomicroscope. The average age of fish in earthen pond determined from the annual ring was 8 years, which agreed with the actual culture records, while those from the Mekong River were 21 years. This information will be beneficial for the breeding programmes and conservation of the MGC.