牛腿山羊对炎热气候的适应性的研究

牛腿山羊为个体大，肉用性能好的山地品种，研究牛腿山羊对炎热气候的适应性，目的在于为同类地区引起该品种提供依据，本试验于１９９５年７月２８日至８月１日在新乡县朝阳种羊场进行，随机选取健康，空怀，经产的成年牛腿山羊和本地槐山羊各１２只，采集血样，实验室内测定Ｔ４和Ｋ＾＋含量，选其中各６只，连续３日测定６：００－７：００时和１５：００－１６：００时的毛丛温度，直肠温度，呼吸率和心率，并且同时测定羊舍内白     

Effects of the Application of Amorphous Silica on Transpiration and Photosynthesis of Soybean Plants Under Varied Soil and Relative Air Humidity Conditions

In epidermal cell walls of soybean leaves treated with amorphous silica accumulation of silica could be detected by means of electron microscopy and electron probe microanalysis. This changed the physical properties of the cell wall and affected the cuticular transpiration and uptake of CO₂: When the soil in which the plants were grown was dry (60% of the field capacity) and relative air humidity was below 50 %, the loss of water through the cuticle was smaller than the loss of CO₂ uptake. This caused a higher grain yield under the conditions of temporarily restricted low air humidity.     

Studies on Nitrogen Economy and Productivity of Wheat as Affected by Rainy Season Legumes under Irrigated Conditions

A field experiment was conducted during July 1986–April 1988 at New Delhi, to evaluate the relative contribution of rainy-season legumes towards the growth and productivity of succeeding wheat ( Triticum aestivum [L.] emend. Fiori & Paol), find out economic optimum dose of nitrogen for succeeding wheat and screen a legume which can be best knitted in wheat based cropping system.
HD 2329 wheat performed better when grown after legumes than when grown after Local fodder sorghum ( Sorghum bicolor [L.] Moench). N economy in wheat was greater (65–78 kg/ha) after Sona clusterbean ( Cyamopsis tetragonoloba [L.] Taubert) and T-9 blackgram ( Phaseolus mungo L.) over sorghum. The economic optimum dose of N for wheat following pigeonpea ( Cajanus cajan [L.] Millsp.), soybean (Glycine max [L.] Merr.), groundnut ( Aracbis bypogaea L.), blackgram ( Phaseolus mungo L.) and clusterbean were 110.1, 103.6, 113.7, 109.6 and 92.3 kg/ha respectively.     

THE ENVIRONMENTAL QUALITY AND RENOVATING PLAN OF THE LOESS PLATEAU AND LIUPANSHAN MOUNTAINOUS AREA IN NINGXIA

<正> 1. The environmental quality of the Loess Plateau and Liupanshan mountainous area in Ningxia The landuse structure in the studied region was very irrational in 1970s, the propor-tions covered by farming, forestry and animal husbandry are separately 50.91%, 6.32% and33.3%. Since 1980s, the farmland has been returned back to forestry and pasture so that the     

保护网络作品著作权的若干法律问题

网络正在我国飞速发展,侵害网络作品著作权的行为也时常出现.加强网络经营管理,加大对网络作品著作权的保护力度,刻不容缓.     

饲料资源量概念及其判断

首先提出并讨论了饲料资源量的主体部分就是饲料能量总量及饲料蛋白质总量的问题。然后,用相关及回归方法筛选出了牛代谢能及粗蛋白质指标。在此基础上,建立了对饲料资源的品质和数量进行判断的蛋能结构指数及蛋能丰度指数体系。     

孕牛血清中早孕因子的分离纯化

采用DEAE－Sepharose(DEAE-琼脂糖凝胶）、CM－Sepharose(CM-琼脂糖凝胶）等离子交换层析、抗孕牛全血清IgG-Sepharose 4B亲和层析等技术，分离纯化妊娠4－5个月健康孕牛全血清中的早孕因子（EPF），用玫瑰花环抑制实验对各阶段产物EPF活性进行检测。结果表明，经层析过柱后的CM－ⅡA提取物有EPF活性。经SDS－PAGE银染显色证实它含有分子量为21、67、80KD的蛋白，实验结果支持21KD的多肽为主要EPF活性物成分。同时实验表明了亲和层析对进一步纯化EPF是可行的。     

Yield losses in soybeans from frogeye leaf spot caused by Cercospora sojina

Three soybean [Glycine max (L.) Merr.]cultivars (Samsoy 1, TGx 1025-12E and TGx 996-26E) were evaluated for yield losses resulting from frogeye leaf spot caused by Cercospora sojina Hara. Replicated field plots were established at two locations in Nigeria that have a high natural infestation of C. sojina. The cultivars were either not sprayed, sprayed once or sprayed twice during the growing season with the fungicide benomyl. Disease spread early in the season was from border rows of a susceptible soybean cultivar into the plots. Mean disease severity (DS) for unsprayed cultivars ranged from 0.6 to 4.5 on a scale of 0–5. Plots receiving two sprays had lower DS values, ranging from 0.5 to 2.4. Differences between unsprayed and double-sprayed plots for yield and 300-seed weight ranged from 2.5 to 58.8 and 0.6 to 28.6%, respectively. Seed weight was negatively correlated with DS.     

麦套短季棉主要农艺措施的优化设计

在大田条件下研究了密度、氮肥施用时间、缩节安化控三因素配合对麦套短季棉霜前花率和皮棉产量的影响。结果表明，合理密植、早施氮肥、全程化控三因素的紧密配合是夏棉优质高产的关键。其最佳组合是密度９万～１２万株／公顷，每公顷基施纯氮７５～９０ｋｇ，蕾期、初花期和盛花期各施缩节安１５ｇ、３０ｇ和４５ｇ化控。