全文获取类型
收费全文 | 2445篇 |
免费 | 241篇 |
专业分类
林业 | 184篇 |
农学 | 104篇 |
基础科学 | 11篇 |
408篇 | |
综合类 | 83篇 |
农作物 | 151篇 |
水产渔业 | 354篇 |
畜牧兽医 | 1088篇 |
园艺 | 58篇 |
植物保护 | 245篇 |
出版年
2024年 | 4篇 |
2023年 | 23篇 |
2022年 | 75篇 |
2021年 | 130篇 |
2020年 | 161篇 |
2019年 | 171篇 |
2018年 | 165篇 |
2017年 | 160篇 |
2016年 | 129篇 |
2015年 | 90篇 |
2014年 | 118篇 |
2013年 | 168篇 |
2012年 | 191篇 |
2011年 | 185篇 |
2010年 | 92篇 |
2009年 | 102篇 |
2008年 | 118篇 |
2007年 | 106篇 |
2006年 | 77篇 |
2005年 | 51篇 |
2004年 | 52篇 |
2003年 | 52篇 |
2002年 | 43篇 |
2001年 | 37篇 |
2000年 | 34篇 |
1999年 | 22篇 |
1998年 | 14篇 |
1997年 | 8篇 |
1996年 | 14篇 |
1995年 | 7篇 |
1994年 | 4篇 |
1992年 | 6篇 |
1991年 | 5篇 |
1990年 | 6篇 |
1989年 | 8篇 |
1988年 | 5篇 |
1985年 | 3篇 |
1984年 | 5篇 |
1983年 | 5篇 |
1982年 | 2篇 |
1981年 | 4篇 |
1980年 | 5篇 |
1979年 | 2篇 |
1977年 | 2篇 |
1976年 | 3篇 |
1975年 | 2篇 |
1973年 | 3篇 |
1970年 | 2篇 |
1969年 | 3篇 |
1948年 | 2篇 |
排序方式: 共有2686条查询结果,搜索用时 15 毫秒
151.
152.
Genetic characterization of banana cultivars (Musa spp.) from Brazil using microsatellite markers 总被引:1,自引:0,他引:1
Flavonoids, in particular the anthocyanins,are responsible for flower colour in manyspecies. The dihydroflavonols represent abranch point in flavonoid biosynthesis,being the intermediates for production ofboth the coloured anthocyanins, through theaction of the enzyme dihydroflavonol4-reductase (DFR), and the colourlessflavonols, produced by flavonol synthase(FLS). In this study the white-flowered,flavonol accumulating Mitchell line ofpetunia was used as a model to examine theinteraction between DFR and FLS enzymeactivities and possibilities forredirecting flavonoid biosynthesis awayfrom production of flavonols and towardsanthocyanins. Introduction of a 35SCaMV-DFR sense transgene construct causedthe production of anthocyanins, resultingin a pink-flowered phenotype. Furthermore,inhibition of FLS production throughintroduction of an FLS antisense RNAconstruct also led to anthocyaninproduction and a pink-flowered phenotype. A combination of both transgenes gave thehighest level of anthocyanin formation. Anthocyanins were produced in the DFR-senseand FLS-antisense transgenic lines in spiteof the greatly reduced levels of geneexpression in the Mitchell line for threeenzymes late in anthocyanin biosynthesis,anthocyanindin synthase, UDP-glucose:flavonoid 3-O-glucosyltransferase andUDP-rhamnose: anthocyanidin-3-glucosiderhamnosyltransferase. Thus, the level ofgene activity required for visibleanthocyanin formation is much lower thanthe high levels normally induced duringpetal development. Altering the balancebetween the DFR and FLS enzyme activities,using genetic modification, may be a usefulstrategy for introducing or increasinganthocyanin production in target ornamentalspecies. 相似文献
153.
The objective of this work was to evaluate rates for applications of water treatment sludge (WTS) as a nutrient source for grasses and leguminous plants cropped in a soil degraded by tin mining in the Amazon Region (Natural Forest of Jamari, Rondonia State, Brazil). The treatments consisted of three rates of nitrogen supplied by WTS (100, 150 and 200 mg kg−1 soil), five combinations of plants, two controls (absolute control, without fertilization; and chemical control, soil+lime+chemical fertilizers). WTS modified the contents of macro and micronutrients in the degraded soil, but it was not, as used in the present study, sufficient for the rehabilitation of the degraded area. 相似文献
154.
Jose Maria da Silva Paulo Cezar Rezende Fontes Carla do Carmo Milagres July Anne Amaral de Abreu 《Journal of plant nutrition》2020,43(18):2833-2843
Abstract Adequate plant nutrition is important to reduce costs and increase the crop yield. This study tried to verify the influence of Nitrogen (N) on plant biomass production and the yield of bell pepper grown in SLAB; quantify the N use efficiency (NUE), and to quantify the residual N concentration in the substrate after the end of the crop cycle. The experiment was carried out in a protected environment. Pepper seedlings were transplanted to SLAB bags containing 40?dm3 of substrate. The treatments consisted of six N rates (0, 1.5, 3.0, 4.5, 6.0, and 7.5?g plant?1) split into 10 fortnightly applications, in a randomized block design with four replications. The fruit yield was evaluated throughout the experiment and after the final harvest, the dry mass of leaves, stem, and root of the plant, the N content and accumulated, the residual nitrate and ammonium in the substrate, and the NUE were evaluated. The rate of 5.51?g plant?1 of N, corresponding to 355.5?kg ha?1, provided the maximum yield of commercial fruits of 1.57?kg plant?1 or 101.2 t ha?1. With increasing N rate, the residual nitrate concentration in the substrate increased and the NUE decreased. 相似文献
155.
Tiago Miqueloto Cauby de Medeiros Neto Clovis David Medeiros Martins Rodrigo Amorim Barbosa Sila Carneiro Da Silva André Fischer Sbrissia 《Acta Agriculturae Scandinavica, Section B - Plant Soil Science》2020,70(3):208-214
ABSTRACTThe aim of this study was to evaluate the defoliation patterns of individual tillers, efficiency of herbage utilisation, and forage production in continuously stocked Brachiaria humidicola cv. Comum swards during periods of the year of restricted pasture growth. The experiment was conducted at the Embrapa, Campo Grande-MS, Brazil, from April to October 2012. Treatments consisted of two grazing management strategies, defined by two ranges of sward height (10–15 and 20–25 cm) managed under continuous and variable stocking rates. The experiment was conducted as a completely randomised block design with three replications. During periods of resource constraints, grazing management strategies based on ‘steady state’ sward heights did not alter defoliation patterns, herbage utilisation efficiency (HUE), and forage production in Brachiaria humidicola swards under a continuous stocking method. A direct implication of our results is that grazing management strategies during the driest and coldest periods of the year in the tropics should be developed based on the conditions most suitable for better promoting faster pasture recovery and a return to production in the following spring; it is unlikely that any grazing management strategy would be successful in increasing herbage production and/or HUE in periods of restricted pasture growth. 相似文献
156.
Oliveira CM Silva Ferreira AC Guedes De Pinho P Hogg TA 《Journal of agricultural and food chemistry》2002,50(7):2121-2124
This work describes a new potentiometric method to evaluate the resistance to oxidation of white wines. Reduction and oxidation titrations were made, and coefficient of variation obtained were 10.87 and 2.65%, respectively. The antioxidant powers of ascorbic acid (Aas) and sulfur dioxide (SO(2)) were evaluated by this method, SO(2) proving to be much less active in this respect than ascorbic acid. The two agents did not demonstrate any antioxidant synergy. A relationship between oxygen present and ascorbic acid was found by the proposed method (1 mmol of O(2) <--> 0.84 mmol of Aas). This method enables the distinction of different wines on the basis of their resistance to oxidation. 相似文献
157.
The main challenges faced in the reclamation of severely degraded lands are in the management of the systems and finding plant species that will grow under the harsh conditions common in degraded soils. This is especially important in extremely adverse situations found in some substrates from mining activities or soils that have lost their upper horizons. Under these conditions, recolonization of the area by native vegetation through natural succession processes may be extremely limited. Once the main physical and chemical factors restrictive to plant growth are corrected or attenuated, the introduction of leguminous trees able to form symbioses with nodulating N?-fixing bacteria and arbuscular mycorrhizal fungi constitutes an efficient strategy to accelerate soil reclamation and initiate natural succession. These symbioses give the legume species a superior capacity to grow quickly in poor substrates and to withstand the harsh conditions presented in degraded soils. In this article we describe several successful results in Brazil using N?-fixing legume tree species for reclamation of areas degraded by soil erosion, construction and mining activities, emphasizing the potential of the technique to recover soil organic matter levels and restore ecosystem biodiversity and other environmental functions. 相似文献
158.
Silva RD Bueno AL Gallon CW Gomes LF Kaiser S Pavei C Ortega GG Kucharski LC Jahn MP 《Fitoterapia》2011,82(6):818-826
This study analyzed the plasma lipid profile, glucose levels and fat deposits in male rats treated with aqueous extract of gross yerba mate, commercial yerba mate or water. Yerba mate treatment did not change body weight gain and lipid profile. The consumption of gross yerba mate significantly increased blood glucose (6.6 mmol/L) as compared to the water (4.8 mmol/L) and commercial group (5.2 mmol/L) and decreased epididymal and intra-abdominal deposits (10.1 mg/g and 23.7 mg/g of weight) as compared to the water (15.4 mg/g and 36.9 mg/g of weight) and commercial group (12.5 mg/g and 28 mg/g of weight). The results suggest that gross yerba mate reduces fat more efficiently but produces a greater increase in blood glucose when compared to commercial yerba mate and water groups. 相似文献
159.
Mendes-Pinto MM Silva Ferreira AC Caris-Veyrat C Guedes de Pinho P 《Journal of agricultural and food chemistry》2005,53(26):10034-10041
Carotenoids and chlorophyll-derived compounds in grapes and Port wines were investigated by HPLC-DAD and HPLC-DAD-MS (ESP+) analysis. A total of 13 carotenoid and chlorophyll-derived compounds are formally reported in grapes, 3 are identified for the first time, pheophytins a and b and (13Z)-beta-carotene, and 3 others remain unknown. In Port wines 19 compounds with carotenoid or chlorophyll-like structures are present, 8 still unidentified. The young wines showed higher total carotenoid content and chlorophyll-like compounds compared to aged Ports, with lutein and beta-carotene as major carotenoids. Among samples analyzed of monovarietal Vitis vinifera L. cultivar wines produced with the five most important Douro varieties, Tinta Roriz contained the highest levels of carotenoids and Touriga Franca the lowest. The forced-aging study indicated that lutein was more sensitive to temperature than beta-carotene. Additionally, aged wines showed higher ratios of beta-carotene/lutein concentrations compared to new Ports. Rates of degradation of chlorophyll derivative compounds were higher than those for carotene and lutein. 相似文献
160.
Diego Villaseñor Renato de Mello Prado Gilmara Pereira da Silva Manuel Carrillo Wuellins Durango 《Journal of plant nutrition》2020,43(18):2785-2796
Abstract Foliar analysis is an effective method to diagnose the nutritional status of plants. However, the mineral concentration in foliar tissue has traditionally been evaluated by assessing the activity of each element, without considering the interactions between them. To address this, dual interactions were calculated using the Diagnosis and Recommendation Integrated System (DRIS) to identify which crop nutrients are most influential in nutrient imbalances and which are the most limiting nutrients for the nutritional status of banana crops in Ecuador. To achieve this, a regional survey of the nutritional status and its productivity levels was conducted for 188 different sites during the crop season in 2017–2018, involving banana cultivars ‘Vallery’ and ‘Williams’, from the Cavendish subgroup. The DRIS calculation method was combined with Beaufils and Jones functions. From the initial 188 foliar samples, 83 samples (representing 44% of the population) were considered to represent the high-yield reference population, with yields of 38–60 t ha?1. The DRIS method defined the mean nutritional balance index, which was not found to be statistically correlated (p?>?0.05) with productivity, revealing that there was no significant association with the nutritional status of the plants. Specific DRIS norms were obtained and indicated that deficiencies in K, N, Ca, and Fe, and excesses in Mn, B, Cl, Zn, S, Cu, and Mg were the most limiting nutrients for banana cultivars in the south of Ecuador. 相似文献