Composition of Typical Soil Minerals and Quantitative Analysis for Influence of Iron and Manganese Forms on Purple Soil Color in Northeastern Sichuan,China     

Liu  Y. F.  Liu  Z. L.  Rao  H. Y.  Wan  X.  Li  L. H.  Sun  S. Y.  Che  M. X.  Liu  M. X. 《Eurasian Soil Science》2022,55(6):781-789

Eurasian Soil Science - Eight soil samples from the Jurassic Shaximiao Formation (J2s) in the Sichuan Basin, China, were taken as the research object to explore the correlation and quantitative...  相似文献   

我国农业科技成果转化存在的问题及对策   总被引：3，自引：3，他引：0  

蔡彦虹  李仕宝  饶智宏  姜鹏 《农业科技管理》2014,(6)

科学技术要转化为现实生产力,在很大程度上取决于农业科技成果转化成现实生产力的进程。文章分析了我国农业科技成果转化的现状与存在的问题,提出改革科研项目立项机制、改革科技评价机制、改革成果奖励制度、推进农业科技成果转化服务方式变革和加强农业科技推广体系机制创新的对策建议,以期为我国农业科技成果的顺利转化提供参考。  相似文献   

Do community-conserved areas effectively conserve biological diversity? Global insights and the Indian context     

Ghazala Shahabuddin  Madhu Rao 《Biological conservation》2010,143(12):2926-2936

The view that biodiversity-rich areas partially or largely managed by local residents, sometimes referred to as community-conserved areas (CCAs), can be effective in biological conservation has gained considerable ground over the past decade. In this paper, we review available scientific information on the conservation effectiveness of such areas globally. We compiled studies undertaken during the last 5 years (2004-2009) that use quantifiable ecological attributes to: (1) compare CCAs with strictly protected areas (SPAs); (2) compare CCAs with open-access ecosystems and (3) study trends in biological attributes of CCAs over time. We found that there were few consistent differences in diversity/species richness of flora or fauna protected under the two types of management or in deforestation rates. However, CCAs tend to harbour a species complement distinct from that of SPAs and show lowered abundances of monitored taxa that are of conservation importance. CCAs conserve biological values more effectively than open-access areas. Also, biological values tend to decline in CCAs over time. We conclude that CCAs could represent a significant improvement over open-access areas in terms of conservation effectiveness, yet fall short of the needs of comprehensive biological conservation. While extremely few studies have been undertaken in India, the trends seen largely concur with global ones. This review, based on a limited sample size, is only a beginning, and is expected to serve as an invitation for further research to address both the question of biological effectiveness of diverse forest governance regimes as well as the socio-economic, demographic and institutional reasons underlying these differences.  相似文献   

Effect of carbon sources on asymbiotic nitrogen fixation in a paddy soil     

V.Rajaramamohan Rao 《Soil biology & biochemistry》1978,10(4):319-321

The effect of various carbon sources on asymbiotic N₂ fixation in a paddy soil was studied by C₂H₂ reduction and ¹⁵N tracer techniques. N₂ fixation increased with increasing concentrations of cellulose and rice straw, but the former was more effective. N₂ fixation was considerably enhanced in soils amended with glucose, sucrose, succinate, acetate, butyrate, pyruvate or n-propanol, while n-butanol, ethanol, lignin or paraffin were ineffective. Succinate at low moisture content and butyrate under flooded conditions stimulated N₂ fixation during a 15-day incubation.  相似文献   

钾调节茎用芥菜同化物运输及茎部膨大的作用机理   总被引：6，自引：0，他引：6  

马全民  陆定志 《园艺学报》1992,19(4):347-352

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Differential responses in anterior pituitary luteinizing hormone (LH) content and LHβ- and α-subunit MRNA, and plasma concentrations of LH and testosterone, in bulls treated with the LH-releasing hormone agonist deslorelin     

William J. Aspden  Alexandra Rao  Katherine Rose  Paul T. Scott  Iain J. Clarke  Timothy E. Trigg  John Walsh  Michael J. D'Occhio   《Domestic animal endocrinology》1997,14(6)

Anterior pituitary gland contents of LH and LHß- and α-subunit mRNAs, and circulating concentrations of LH and testosterone, were determined in bulls treated with the LH-releasing hormone (LHRH) agonist deslorelin. Brahman (Bos indicus) bulls (14-month-old) were allocated to two groups and received the following: Control (n = 5), no treatment; Deslorelin (n = 4), four deslorelin implants (approximately 200 μg total deslorelin/day) for 36 d. Plasma concentrations of LH were higher in bulls treated with deslorelin on Day 1, had returned to typical levels by Day 8, and did not differ for control bulls and bulls treated with deslorelin from Day 8 to Day 29. Pituitary content of LH on Day 36 was reduced (P < 0.001) in bulls treated with deslorelin (33 ± 4 ng/mg) compared with control bulls (553 ± 142 ng/mg). Relative pituitary content of LHß-subunit mRNA was also reduced on Day 36 in bulls treated with deslorelin (Control, 0.65 ± 0.10; Deslorelin, 0.22 ± 0.04; P = 0.003). However, α-subunit mRNA relative content did not differ (Control, 0.73 ± 0.15; Deslorelin, 1.06 ± 0.12; P > 0.05). Plasma concentrations of testosterone were increased over the period of the experiment in the bulls treated with deslorelin compared with control bulls. This is the first demonstration of reduced pituitary content of LHß-subunit mRNA and LH, and unaltered content of α-subunit mRNA, in bulls treated with LHRH agonist. This was associated with apparently typical plasma concentrations of LH and elevated plasma testosterone. The anterior pituitary in bulls treated with LHRH agonist, therefore, undergoes classical desensitization and downregulation, but plasma LH and testosterone are not suppressed.  相似文献   

Variation amongst protoplast-derived moth bean Vigna aconitifolia plants     

I. D. Arya  Sarita Arya  D. V. Rao  N. S. Shekhawat 《Euphytica》1990,49(1):33-38

Summary Protoplasts were isolated from leaves of a single plant of Vigna aconitifolia, a drought resistant grain legume. The protoplasts regenerated and formed colony and calli from which 50 entire plants were regenerated and transferred to field conditions. Only 7 plants survived upto maturity and they flowered and produced pods with seed. The protoplast derived plants showed variation in important characters. Two groups of characters (one with 7 sets and another with 6 sets) were studied in the protoclones. In first group protoclones showed variations in seed germination, maturity age, pod length, pod and seed colour, number of abortive seed per pod and response to field rots, however, not much difference was recorded in pollen stainability and meiotic behaviour in these protoclones. In second group analysis of variants showed significance difference for plant height, rachis-length, length and breadth of mature odd leaflets, seed per pod and weight of seed. The results indicate that protoplast can be source of variation in this crop. However, detailed biochemical and genetical analysis of protoclones are required.  相似文献   

Genetics of Five Seed Esterase Isozymes in Pearl Millet     

M. V. Subba  Rao  Y. Saideswara  Rao V. Manga 《Plant Breeding》1989,102(2):133-139

Inheritance and linkage relationships of pearl millet seed esterase isozymes were studied using; polyacrylamide dise: gel electrophoresis and α-naphthyl acetate as substrate. The Zone of enzyme activity was resolved into five bands. The presence of a band showed complete dominance over its absence. Each one of the bands (1 to 4) was under the control of a single gene. Band five was found to be controlled by three independent loci with duplicate gent action Loci for Est₁, Est₃ and Est₄ Were found to be linked. Est₂ Was independent of this linkage group.  相似文献   

Production and characterization of hybrids between Cajanus cajan × C. reticulatus var. grandifolius     

L.J. Reddy  N. Kameswara Rao  K.B. Saxena 《Euphytica》2001,121(1):93-98

Cajanus reticulatus var. grandifolius, endemic to Australia and a wild relative of the cultivated species, C. cajan, was successfully crossed with the latter as the female parent. The major wild species characters such as persistent stipules, long pod hairs, pod shattering, brown seeds with grey speckles, and presence of seed strophiole were dominant in the hybrid. For growth and branching habit, and leaflet, flower, pod, and seed size, the hybrid was intermediate between the parents. The meiotic cells of the hybrid were found to have quadrivalents, trivalents, univalents,and showed reduced chromosome pairing as revealed by the increased number of rod bivalents per cell at metaphase-I, and stickiness and precocious movement of chromosomes to poles in the second division. In comparison to the parents, the hybrid had fewer pods and seeds. However,these anomalies in the interspecific hybrid are not significant enough to preclude the gene transfer from C. reticulatus to the cultivated species through a sexual route. This revised version was published online in August 2006 with corrections to the Cover Date.  相似文献   

肥料用量及施用方法对烤烟漂浮育苗烟苗素质的影响   总被引：5，自引：0，他引：5  

杨绍聪  张艳军  段永华  吕艳玲  饶敏  沈祥宏 《中国农学通报》2006,22(11):228-228

采用小拱棚vaulted shed进行烤烟virginal tobacco漂浮育苗试验，以烤烟育苗肥(N 14.76%P2O57.33%、K2O 18.66%)用量及施用方法为参试因子，从出苗率emergence rate和成活率，烟苗的主要农艺性状、干物质积累量accumulation、各部位营养元素含量等方面进行探讨研究，结果表明，烤烟漂浮育苗施肥量以0.9kg/池(以可放入34个长66cm、宽34cm、高5cm的育苗盘的育苗池计)、并采用出苗期施60%和大十字期施40%的两次施肥方法的处理，其烟苗N、P、K、Ca的吸收量absorption amount，根部最高，茎部较高，而叶部适中，相应培育出的烟苗，其茎高、茎直径、根部干重、茎部干重及根冠比最大，因此烟苗的综合素质最好。  相似文献