Abstract:A comparison experiment with one non aromatic and three aromatic varieties of rice under no nitrogen and nitrogen application showed that nitrogen application increased photosynthesis and respiration rates and nitrogen content of rice plant. However, the increase of photosynthesis rate was not very significant. In comparison, the promotion of leaf respiration by nitrogen application of Ratna, a non aromatic rice, was significantly larger tnan that of HKR228, an aromatic rice variety. Respiration rate and nitrogen content of rice plant dropped remarkably during panicle initiation and heading periods. After heading the nitrogen contents of various parts of rice plant were arranged as follows: blade>panicle>sheath>culm. Basmati 370 had a small culm and a relatively higher plant height. The increase of plant height of this variety by the application of nitrogen was significantly larger than that of the other three varieties. This was one of the major physiological causes difficult for a further increase of the yield of scented rice of Basmati type.

Abstract:桑树硬会插穗基部经吲哚丁酸处理后在自然平均水温２４．５℃，气温２８．８℃条件下进行水培扦插，第２５ｄ后抗青１０号，剑持，黑油桑，桐乡青的发根率分别为１００％、７０％、７０％和２３．３％。对皮孔出根作了扫描电子显微镜观察。

Abstract:A study was conducted to determine the serological relationships between strains of Pseudomonas solanacerum in China. Four corresponding antisera were prepared to a kind of membrane protein extracted from cells of four strains representing different biotypes of P. solanacerum respectively. By using Ouchterlong double diffusion tests, 212 isolates from ninteen different hosts in six provinces and cities could be grouped into eight serotypes. It was demonstrated that 147 isolates of them belonged to serotype I which was the predominant one (69%) including thirteen various hosts. SDS PAGE profiles of mebrane proteins extracted from strains representing eight serotypes of P. solanacerum showed that there were some differences between serotypes.

Abstract:A new fungal disease in orchid plants was discovered recently at Wutong Shan Orichid Nurseries Shenzhen, Guangdong province. The fungus produced new spots on orchid leaves in the middle of Fberary, and the disease epidemic peak occured from April to June when the cloudy and damp weather continuously existed. The disease was more serious if orchid plants were cultivated under windless and hot condition. After following Koch's postulation and comparative inoculation test, the pathogen was identified as Stagonospora curtisii Sacc.. A detailed description of the pathogen and symptoms were given in this paper. In addition, the biological characters of the pathogen, and the inhibting effect of 12 bactericides on germination were tested respectively. The pathogen was reported in orchid plants for the fist time.

Abstract:在线路调查和样方调查的基础上分析了广东天 山山地常绿阔叶林的结构特征，天 山山地常绿阔叶林外貌终年常绿，群落的区系组成以亚热带的科属为主，优势科为壳斗科，八角科，山茶科，樟科，冬青科，安息得地料，等优质种亦大部份由之些科的种类组成。

Abstract:Soil characteristics of 5 different successional types of vegetation in Chebaling National Nature Reserve, Guangdong Province were investigated. The preliminary results showed that the soil characteristics varied greatly with different sites. In general, the intact forest possessed higher content of organic matters, total nitrogen, available phosphorus and available potassium. As compared with the other broadleaved forest, the secondary grassland dominated by Miscanthus floridulus and Imperata cylindrica were lower in available phosphorus and total nitrogen, but higher in available potassium and pH value. The pine woodland were lower in organic matters and available potassium, but higher in available phosphorus than other vegetational types.

Abstract:对华南赤红壤的主要物理性状进行了研究，结果表明，土壤水稳性结构体的含量为４２％－４８％，并与〈０．００５ｍｍ颗粒含量具显著正相关：０－１０ｃｍ土层具有较高团聚体孔隙度和导水率，且在高基质势势范围内具有较好的通透性和供水性能。

Abstract:１９９４年利用密闭箱法观测了广州地区早稻和晚稻ＣＨ４的排放，结果ＣＨ４平均排放通量早稻为０。２２－３．８１ｍｇ／ｍ＾２．ｈ，晚稻为０．３６－１７．６３ｍｇ／ｍ＾２．ｈ。常规ＣＨ４排放明显低于国内其服稻区，对其原因进行了初步分析。

Abstract:采用广州地区农民常用施肥施类型和灌溉方式，研究晚季稻田ＣＨ４，Ｎ２Ｏ排放规律及排放量。试验初步表明，在一定的施肥量及气候条件下，灌溉水管理是决定ＣＨ４、Ｎ２Ｏ排放量的较主要因素，而这一因素对ＣＨ４、Ｎ２Ｏ排放量的影响互为相反，发即施肥稻田处于灌溉淹水状态有利于ＣＨ４排放而不利于Ｎ２Ｏ排放；

Abstract:用人工土快滤处理系统处理城市污水的实际日处理水量为６３ｍ＾３，年水力负荷率为２０８ｍ，ＢＯＤ５负荷为１５ｋｇ／ｍ＾２。试验结果表明：人工土快滤处理系统的处理效果是稳定的，其对进水ＣＯＤ、ＢＯＤ５和ＳＳ的年平均去除率分别为９０％，９６％和９５％；

Abstract:研究了芒果果实钙吸收的变化动态。结果表明果实钙素积累呈单Ｓ型。最大吸收期出现在果实快速生长期，此吸收量约占果实总钙的９０％，钙吸收速率与果实鲜重增长速率呈正相关，表明果实生长本笛才是钙乾地果实的首要调控国在子。

Abstract:紫花芒果在冷害低温中贮藏，对其进行间隙升温处理。结果表明：芒果发唾冷害以后，其内源ＳＰＤ和ＳＰＭ含量显著增加，但内源ＰＵＴ和ＣＡＤ含量的变化不显著；冷害还导致了ＡＣＣ的累积。间隙升温处理显著地减轻了芒果的冷害，延迟了多胺及ＡＣＣ含量的上升。

Abstract:通过酶谱比较试验，结果表明，紫花芒果分别经热水，保鲜剂，热水加保鲜剂处理后，在储藏实期，体内过氧化笺酶同工酶比对照减少。试验中发现，芒是要在储藏期间，体内过氧化物酶同工酶经历复杂的“调整改组”过程。

Abstract:采用脱氨再生几丁质凝胶亲和层析法分离纯化得到电泳纯萝卜溶菌酶酶液，研究了一些常用酶制的稳定剂的防腐剂对萝上眩溶菌酶活性的影响，结果表明：ＮａＣｌ对酶有少量的激活作用；ＮａＦ，ＣａＣｌ２，苯甲酸等在不同程度上对酶活性有抑制作用；而乙醇和甘油对该酶活性影响不大。

Abstract:研究结果表明，５－２０ｍｇ．Ｌ＾－１的去莠津使黄瓜叶片过氧化氢活性和蛋白质含量分别升高７．５５％－１０．０７％和１．４２％－７．６７％。１０－２０ｍｇ．Ｌ＾－１的去莠津分别使黄瓜叶片ＤＮＡ和ＲＮＡ含量量升主同８．１７％－１０．９５％和４．４７％－８．６９％。去莠 的过氧化氢酶活性无影响。

Abstract:Experiments were conducted to study the relationship between membrane lipid peroxidation and deteriorative changes in postharvest straw mushroom. The results showed that fresh weight loss, deformability and permeability increased during the storage at the three different temperature. With accumulation of MDA, SOD activity and GSH content decreased. The increase of MDA content was positively correlated to the increase of fresh weight loss, whereas deformability and permeablitlity, were negatively correlated to the decrease of SOD activity and GSH content. It was suggested that membrane lipid peroxidation might be the major cause of the deteriorative change in postharvest straw mushroom during storage.

Abstract:测定了冷藏期间鲫鱼和罗非鱼肉中三甲胺、次黄嘌呤含量及鱼新鲜度的变化。结果表明鲜活的鲫鱼和罗非鱼肉中均不含三甲胺，次黄嘌呤含量也不同。冷藏期间三甲胺，次黄嘌呤含量随着冷藏时间延长而升高，三甲胺含量＜２０μｇ／ｇ，次黄嘌呤含量增加在５０％以内鱼肉保持新鲜；三甲胺含量超过３５μｇ／ｇ，次黄嘌呤增加至１００％，鱼肉开始腐败变质，不具食用价值。

Abstract:将插有传染性喉气管炎病毒（ＩＬＴＶ）糖蛋白Ｂ（ｇＢ）基因的重组质粒ｐＩＬｇＢ克隆，然后用碱法抽提，乙醇沉淀。质粒ｐＩＬｇＢ经ＥｃｏＲＩ酶切后，用地高辛标记，获得ＩＬＴＶｇＢ基因的核酸探针。该探针分别与传染性喉气管炎病毒，传染性支气管炎病毒，传染性法氏囊病毒，禽流感病毒，马立克氏病病毒，新城疫病毒核酸斑点杂交，发现只有传染性喉气管炎病毒的核酸有阳性反应，说明该探针对ＩＬＴＶ有高度的特异性。ｇＢ基因核酸探针与不同浓度的核酸杂交，能检出０．０１μｇ的核酸，表明该探针高度敏感。实验结果还显示，探针能重复多次使用，检测效果不变。

Abstract:In the present study, it was demonstrated that large numbers of mast cells occurred in the duck lymphatic organs. The results obtained with transmission electron microscopy(TEM) and five sorts of histochemical staining methods showed that these mast cells exhibited heterogeneity in shape, size, metachromasia,mucopolysaccharide content of the cytoplasmic granules,staining property and ultrastructure . Histochemical staining revealed that neutral mucopolysaccharide type and acidic mucopolysaccharide type mast cells were present in these organs, and the latter could be classified forther into sulfate mucopolysaccharide type and carboxyl mucopolysaccharide type. In addition, their granules contain bioamines, but probably not heparin. They were varied in shapes and sizes in the thymus,lymphatic node and cloacal bursa, but were smaller , round or ellipse in spleen. Under TEM, these mast cells had a round or elliptic nucleus , and were nearly devoid of processes on the surface, but had a few organelles and numerous scretory granules in the cytoplasm;the granules contain particles,but no scroll or lamellar structures.

Abstract:利用猪场现场测定资料分析杜洛克，长白，大白３个品种１０３５头母猪的４２３２胎的分娩资料，研究了不同品种，胎次，交配方式及选育年度对窝仔数，妊娠期和产仔间距的影响。结果表明，不同品种的妊娠期有差异，杜洛克最短、长白次、大白最长；在常规选育过程中，不同年 度窝仔数开始时有所提高，而产仔间距则未有改进。

Abstract:A computer controlled magnetic particle brake simulated loading system was developed for agricultural machinery experiments.The loading system included a computer,a PC-6313 interface card,a loading installation and a measuring installation. The system programme was designed with Turbo C and assembly language.A proportional feed back control method was used to improve the accuracy of the loading system. Operation was easy,using a Chinese characer menu as interface surface.Test results showed that the loading system could be used as a general-purpose tool in agricultural machinery experiments.