Abstract:The membrane lipid peroxidation and protective enzyme activity were Compared in leaves ofvarious Sugarcane genotypes in solution culture by full strength and phosphorus- deficient Hoaglandsolution. It showed that phosphorus deficiency could incrase the membrane lipid peroxidation and changethe artivity of protective enzymes. The changes were somewhat different between different genotypes, itmay be connected with the sbility of low phosphorus tolerance.

Abstract:In order to probe the roles of calcium in drought resistance of plants, the soybean seedlinggrown in the solntion with different calcium conentration (0, 5, 14 mmol.L-1)were used to study theeffects of water stress (- 0.5 Mpa, PEG 600) on the activities of SOD, POD and CAT and theirisozymes in the leaves of differen calcium. The results showed that under water stress, the SOD activityincreased, the CAT activity deceased. Similar tendency of POD activity was found among the leaves ofthree Ca2+ treatments, it was "increased Becreased." The PAGE analysis showed that under waterstress condition, there were 10 bands of SOD, 3 bands of CAT in the leaves of different Ca2+ treatmnts.There were changes in bands of POD under both conditions.

Abstract:应用二闪正交旋转回归组合设计方法，筛选小菜蛾半合成人工饲料配方。用筛选的优化饲养小菜蛾，在温度２４￣２６℃，相对湿度６０％￣７０％的条件下，幼虫历期８．４５ｄ，化蛹概率０．７４７，羽化概率０．９４９，每浆蛹重５．１４ｍｇ，紫虫产卵量１３５．６７粒，与自然饲料相比，存活率和发育速度相似，蛹重和产卵量增加。

Abstract:成虫取食、交尾均于白天进行，平均寿命８．７￣１２．６ｄ，平均每雌产卵归７０．５￣１２０．８粒，产卵高峰在羽化后３￣７ｄ，卵在白天和晚上均可孵化，孵化率９０．８％以上。幼虫白天和晚上均可取食，不同虫龄和在不同作物上，其取食不同。化蛹一般在上午１０时前进行，９５．３％掉到土壤中，羽化一般在上午１０时前进行，９５．３％掉到土壤中。羽化一般在上午１０时前，性比１：１，虫态历期与温度成反相关。１９９５年广州

Abstract:根据不同的接种方法、接种物浓度、保湿时间和温度对豇豆锈病苗期抗病性表现的影响，筛选出一套方便、可行的苗期抗病性鉴定技术：即在２０￣３０℃温度下，用每视野含３０个孢子（１０×６倍）的夏孢子悬浮液于１￣２处复叶的喷雾接种，保湿１８￣２４ｈ，接种后１０￣１４ｄ调查２１个供试品种的病指指数，结果表明品种间抗病性差异显著，其中，益农红仁特长豆角表现免疫，金山长豆和成都紫荚白露表现为高抗。

Abstract:After testing some factors such as stomata, sugar content and the activities of peroxidase(POD) polyphenoloxidase (PPO) etc. from vary ridgegourd (Luffa acutangula ) varities with differenthardiness, the results showed that in leaves of ridgegourd, the PPO ratio of reducing sugar content to totalsugar content and the stomata density of its lower epidermis were negatively relevant to its resistance a-gainst downy mildew (Pseudopronospora cubensis ). The corelation coefficients were 0. 986 1, - 0. 716 5and - 0.969 2 respectively, while the total sugar content were positively relevant to its resistance (r =0. 911 5 ). However POD activity, reducing sugar content and stomata size were all irrelevant to the resis-tance.

Abstract:The co-toxicities of tea saponin mixed with pesticides Bt, rotenone and dimethoae were testedrespectively. Results showed that tea saponin had significant synergistic actions on these pesticides. Afteradded tea saponin at concentrations of 1 000 and 2 000 mg/L into pesticide dilutions, the co-toxicity co-efficients of Bt admixtures on the third and fourth instar larvae of diamondback moth Plutella xylostella(L.) were 168. 10, 260. 93 and 408. 15, 543. 68, respectively, while the LC50 s of rotenone anddimethoate to turnip aphid Lipaphis erysimi (Kaltenbach) were reduced by 34. 88%, 58. 10% and 18.1 3 %, 53. 70% respectively.

Abstract:Microsporognesis, megasporogenesis and development of male, female gametophyte in tomato(L. esculentum) were studied. The result showed that the cytokinesis of the pollen mether cell in meiosiswas of the simultaneous type. The arrangement of microspores in the tetrads was regular tetrahedroid. Thetapetum cell in tomato was the same tupe and was derived from the primary parietal cell, the modle oftapetum was glandular tapetum. The microspore was divided into two-cell polln(male gametophyte): onevegetative cell and one genrative cell. The stigma was wet type, the style was solid, anatropous ovule, sin-gle integument. The tetrads from the meiosis of megaspore mether cell lined staightly, but only the tap onenear micropyle could developed into the megaspore and other three cell degenerated. The developmet ofthe embryo sac (female gamtophyte) conformed with the polygonum type.

Abstract:The seedless Litchi is a valuable strain and would be Worth popularizing. The charactersseedless Litchi has are double fruits developing at the same time, no seed, rich arils, and stable yield inthe crops in each year.The megaspores have all degenerated forms in whole developmental phase.So itcan't form the embryo. This is the main reason of forming the seedless type.

Abstract:The karyotypes of Anguilla anguilla and Anguilla japonica have been determined form thekidney cell by the method of PHA pericardial cavity injection in vivo. The chromosmes were studied bythe combination of scanning electronic microscopy(SEM). The results showed that the diploid chromo-some numbers of Anguilla anguilla and Anguilla japonica are the same of 38(2n = 38), the metacentric,submtacentric and telcenteic chromosomes of Anguilla anguilla are 6, 3, 10 pairs and Anguilla japonica5,5,9 pairs respectively. The total chromosomes arm count of Anguilla anguilla and Anguilla japonicaare 56, 58 respectively, There is a satellite in t3 chromosome of Anguille anguilla. The comparison ofkaryotypes of Anguilla anguilla and Anguilla japonica can provide the basis for classifying them andstudy the relationship of their systematic evolution.

Abstract:紫花芒在冷害温度（２±５）℃下贮藏，经间歇升温处理后，延缓了２种抗氧化指标：还原型谷胱甘肽（ＧＳＨ）、还原型维生素Ｃ（ＡｓＡ）含量下降，这样维持较高水平的内源自由基清除剂较长时间，减慢了氧化型谷胱甘肽（ＧＳＳＧ）、氧化型维生素Ｃ（ＤＨＡ）、膜脂过氧化产物丙二醛（ＭＤＡ）含量和细胞膜透性上升，明显减轻冷害症状，是一种有效的抗冷害措施。

Abstract:对海岸带农林复合系统中的池杉、青秆竹、水稻、甘蔗等主要植物种类和生物量与元素组成进行研究。结果表明：６年生池杉林分、青秆竹林分均是叶的养分元素含量最大，树干的最小；其养分元素积累量分别为２６８９．４８１和３２９７．４４２ｋｇ／ｈｍ＾２，其养分元素各界量排序分别为Ｎ〉Ｃａ〉Ｍｇ〉Ｋ〉Ｃｌ〉Ｎａ〉Ｐ、Ｋ〉Ｃｌ〉Ｎ〉Ｍｇ〉Ｃａ〉Ｐ〉Ｎａ；水稻（杂优）、甘蔗的养分元素各界量分别为１１８６．０８３、１１６１

Abstract:The seed rain of the mixed evergeen and deciduous broad-leaved forest on Fanjing Mountain,i.e. Fagus lucida. Illicium ternstroemioides community, is 260 m-2 of 18 species. The amount of theripe germinative seeds in the seed rain is 80 m- 2. At the beginning of the natural germination of the seedbank, the viable seeds in the seed bank are 2 076 m-2 of 33 species. Of the viable seeds, the presentplant seeds are 204 m-2 of 18 species, the seral earlier species seeds are 1 872 m-2 of 15 species. Theviable seeds belong to 20 woody species and 13 heth species. All the seeds in the litter of the seed bankare produced by the present plant. The species and the amount of the viable seed in the soil reduce grad-ually with the depth increasing of the soil. At the beginning of the natural germination of the seed bank,there are many viable seeds of the present plants in the seed bank. The regenerative potential of the pre-sent commnity is good.

Abstract:A new methed in GIS-based land resource evaluation of overlaying the coverage of land re-source type map separately with single-factor-coverages of each evaluation factor and obtaining basic datafor evaluation by operating the polygon attribute table (PAT) of each resulted coverage was advanced,and its advantages compared with traditional methods was pointed out.

Abstract:Four profiles of acid sulphate soils and 20 Samplings were taken according to different soiltypes and land use patterns in Taishan city, Guangdong province. The different sulfur forms including to-tal sulfur, pyrite (FeS2), jarosite, water-soluble sulfur, exchangeable sulfur, element S and organic Sand soil pH etc. were analyzed and estimated. The data showed that the contet of the total sulfur is veryhigh in soils in this region, and the sulfur in ASS was mostly in inorganic forms and dominated by pyrite,water - soluble sulfur and exchangeable sulfur; the content of element S and organic S was relatively low.The total suifur and pyrite usually chang with a trend of increasing from soil surface horizon to bottom;jarisite, water - soluble sulfur and exchangeable sulfur had similar change trend in profile, they common-ly accumulated in layers with a certain pH or low pH values. Coefficients between pH and exchangeablesulfur, contents of jaresite and total suifur are -0.800 7, -0. 437 4 and - 0.572 9 respectively; thecomplicated relationship was found between pH and content of pyrite in soils. The occurrence of jarositehas important diagnostic sighficance in the soil development and classification.

Abstract:Complexes in various size fractions from different fertility red soils obtained from Quaternaryred clay were separeted by ultrasonic dispersion in water. The various active organic phosphorus andphosphatase were analyzed in the paper. The results showed that the amount of organic phosphorus insoils and their complexes became larger with the increase of the fertility of red soils. The red soils andtheir complexes were dominantly involved in moderately active organic phosphorus (MAOP) and moder-ately stable organic phosphorus (MSOP), which were 80% of the total organic phosphorus. There was asignificantly positive relationship between soil phosphatase and soil complexes phosphorus.

Abstract:Nitrous oxide emission flux had direct relation with the kinds of fertilization and the methodsof irrigation applied to the rice field during the late rice growing season. There were four kinds of fertiliz-ers applied. The mean amounts of N2O emission flux, the ratio of which for the four treatments, i. e.,chemical fertilizer only, chemical fertilizer plus pig muck, chemical fertilizer plus mushroom fertilizer andpig muck only was 10: 2: 1:0. Nitrous oxide continuously flowed from the field applied with only chemicalfertilizer during the whole growing period. Because flooding the rice field would lower down the nitrousoxide emission, while drying the field would result in increase of the emission, flooding the rice fieldwould be an efficient methed to reduce the N2O emission flux atter application of fertilization.

Abstract:This research was conducted to study the effect of different tillage management systems (TMS) and working depth on maize production. The TMS used in experiment 1 were moldboard + disc harrow (MB+DH), chisel (CH), disc harrow twice (DH2), rotovator (RT) and no-tillage (NT) as a control. This experiment was conducted on a sandy loam soil. The results showed highly significant differences between treatments. The chisel (CH) significantly influenced maize growth parameters, reduced soil bulk density, soil tillage resistance, increased soil moisture at all depths and finally gave higher maize yield and yield components parameters while the no-tillage (NT) treatment gave the lowest performance. Experiment 2 was conducted on a clay soil with two treatments, no deep loosening (NDL) 20 cm depth and deep loosening (DL) 40 cm depth using tine. The results showed that the deep loosening significantly increased soil moisture, reduced soil bulk density, soil tillage resistance and finally increased maize production.

Abstract:The cultivation model of high yield and high profit for super-sweet corn in planting density andN-P-K fertilizer combination was conducted by applying agricultual system engineering theory and optimunD satuation design and the results were analysed comprehensively. The results showed that it got 22 500yuan gross profit with 57 637 plants in density,209.3 kg pure N, 162.7 kg K2O and 104.7 kg P2O5 perhectare in the middle fertile soil condition of Guangdong province. Before releasing new variely with com-pact plant type and adaptation to the high plant density, it does not exceed 337.5 kg pure N, 337.5 kgK2O, 168.8 kg P2O5, and 75 000 plant per hectar in density.

Abstract:用玉米生长发育过程的计算机模拟模型ＣＥＲＥＳ－ＭＡＩＺＥ，模拟了广东省不同地区、不同季节玉米生长发育过程，分析了玉米生产与气象条件的关系：春季播种的，产量较高，但早春的低温阳雨天气不利苗期的生长，易出现病虫害及湿害；中北部地区４￣７月播种的，产量相对较低，且易受热带暴风雨的危害；８－９月播种时，产量最高，可充分利用秋季的光热资源，发挥品种的潜力；最佳播期北部７月１５日￣８月１５日，中部７月２０日－

Abstract:用ＦＴＩＲ、ＤＳＣ和动力学粘度测量的方法对糠醛树脂胶粘剂结构及贮存期间稳定性进行了研究。得出了糠醛型脲醛树脂胶粘剂的贮存条件及其对贮存稳定性的影响的规律。结果表明：糠醛型脲醛树脂存在较我的ＵＲＯＮ环，所需固化温度较低；环境温度为４０℃，胶液的ｐＨ值为８．５时，树脂的稳定性能较好，贮存期较长，达３０ｄ以上。

Abstract:By means of the concepts of the same order and the oppoite order between functions, studiedthe properties of weighted powr means of functions and their functional characteristics such as the loga-rithmic convexity and monotony when they are considered as functions of their power exponents. As appli-cations a new mean was introduced, comparisons between the so-called Holder's means and the Sto-larsky's means were made, and results of the refinements of the Ostle-Tewlliger inequality and of thearithmtic-geometric mean inequality were obtained.

Abstract:A semi-local convergence theorem and an error estimation are proved for king-Wemermethod, when applied to undifferentiable nonlinear operator equations. The results obtained generalse andextend the ones proved in Wang Xinghua and King. R. F.

Abstract:Petroleum Spray Oils(PSOs) are effective against citrus mites, scales, white-flies, aphids,psylla and leafminer while they are safe to the natural enemies. The old, broad-range PSOs can easilycause phytotoxicity. With the development of oil formulations, PSOs have become more effective againstpests and safer to plants. They are playing an important role in the integrated management of pests in cit-rus.

Abstract:烟草赤星病【Alte171almhe（E．＆E．）Ted．＆Wadk．提烟草上发生较多的叶麻类病害之一，在广东省危害日渐严重．由于该病害的发生临近或正处于烟草的来搞期，不宜施用化学农药，最好选育抗病品种防治，故了解人工接种的各有关因素极为重要．虽国内外对此病的病原菌及其生物学特性都有一些研究，但烟草赤星病菌的生态适应颇强，不同地理分布的菌株，其致病力、危害情况差异较大．遂对此菌的强毒力菌株在抱于萌发，营养生长及抱子形成三方面进行了研究．强毒力菌株筛选：接种植物为当前广东烟草栽培的主要品种K－326（中感）成株，试验菌…

Abstract:造纸黑液木素是一类酚型网状结构大分子，其结构单元具有较大的反应活性，表现出较强的鳌合性能和胶体性能，因而广泛地应用于工业方面．例如：利用黑液木素制备表面活性剂，作为乳化剂对陶土、水泥、颜料和杀虫剂起扩散作用；作为高分子材料原料制取聚酯纤维和碳素纤维等（张可等，lop）．然而，对黑液木素在农业肥料中的应用研究较少．本文旨在通过对黑液术素进行结构修饰引人功能性基团来研制高效的黑液木秦螫合h肥，为黑液木盆的利用探索新途径．这对发展造纸工业、净化环境及农业资源开发有着重要意义．1材料、仪器与方法1．1材料和仪…