全文获取类型
收费全文 | 978篇 |
免费 | 52篇 |
国内免费 | 40篇 |
专业分类
林业 | 67篇 |
农学 | 34篇 |
基础科学 | 15篇 |
521篇 | |
综合类 | 209篇 |
农作物 | 50篇 |
水产渔业 | 43篇 |
畜牧兽医 | 87篇 |
园艺 | 13篇 |
植物保护 | 31篇 |
出版年
2024年 | 8篇 |
2023年 | 15篇 |
2022年 | 33篇 |
2021年 | 26篇 |
2020年 | 32篇 |
2019年 | 36篇 |
2018年 | 26篇 |
2017年 | 47篇 |
2016年 | 41篇 |
2015年 | 37篇 |
2014年 | 33篇 |
2013年 | 78篇 |
2012年 | 70篇 |
2011年 | 57篇 |
2010年 | 54篇 |
2009年 | 53篇 |
2008年 | 44篇 |
2007年 | 45篇 |
2006年 | 43篇 |
2005年 | 47篇 |
2004年 | 33篇 |
2003年 | 30篇 |
2002年 | 15篇 |
2001年 | 14篇 |
2000年 | 27篇 |
1999年 | 20篇 |
1998年 | 17篇 |
1997年 | 11篇 |
1996年 | 18篇 |
1995年 | 10篇 |
1994年 | 8篇 |
1993年 | 10篇 |
1992年 | 8篇 |
1991年 | 4篇 |
1990年 | 6篇 |
1989年 | 3篇 |
1988年 | 5篇 |
1987年 | 4篇 |
1986年 | 1篇 |
1985年 | 1篇 |
排序方式: 共有1070条查询结果,搜索用时 15 毫秒
1.
【目的】利用两种外源硅肥材料开展试验,研究外源硅对土壤重金属Cd有效性以及稻谷Cd含量的影响。【方法】以硅胶(分子式mSiO2.nH2O,含量98%以上)、液体硅肥(SiO2浓度≥23%)作为外源硅肥材料,通过在重金属镉Cd超标稻田土壤施用硅胶,在水稻分蘖期、孕穗期喷施液体硅肥,研究硅钝化稻田土壤重金属Cd有效性及降低稻谷Cd含量。【结果】施用硅胶达到100kg/667m2对降低土壤有效Cd含量有极显著效果,表明稻田施用硅胶可以钝化土壤重金属Cd有效性;施用硅胶达到100kg/667m2对降低稻谷Cd含量有显著效果,施用硅胶再配合喷施液体硅肥时,对降低稻谷Cd含量有极显著效果;施用硅胶、液体硅肥对提高稻谷产量有显著作用。【结论】基施硅胶配合喷施液体硅肥,对钝化土壤重金属Cd有效性,降低稻谷Cd含量,提高稻谷产量具有显著效果。 相似文献
2.
本试验利用无磷原料配制无磷饲粮,选择低磷原料配制基础饲粮,用一定比例待测植物性饲料替代基础饲粮配制待测饲粮,通过平衡试验法测定了35日龄艾维茵肉仔鸡对玉米、豆粕、麦麸3种饲料原料的总磷真利用率。结果表明:在控制饲粮含磷量低于肉仔鸡的磷需要量,研究饲料磷的最大利用率时,肉仔鸡的内源磷排出量为(44.84±3.14)mg/d。玉米、豆粕和麦麸的总磷真利用率分别为(16.42±3.36)%、(28.34±4.90)%和(46.48±4.29)%。利用总磷含量的1/3和非植酸磷含量估计肉鸡饲料有效磷并不准确。因麦麸本身含有高活性的植酸酶,肉仔鸡可部分利用其植酸磷。 相似文献
3.
This paper investigates the coordinated operation of the progress planning with the resource planning when carrying out engineering projects and puts forward a method of "RSM" under the resource limit conditions. Then, the "RSM" was improved to avoid complicated calculation. This method not only reduces the calculating work by hand but saves computer's memory as well, making the time-resource optimization work more quick and convenient. 相似文献
4.
In most cases, when calculating soil water availability, only thewater content is considered. The effect of salinity on the wiltingpoint is neglected. The objective of this work is to use asimulation model (CERES-maize) in order to predict cornyields as a function of water salinity under severalenvironmental, agrotechnical, and plant characteristics. A modelis presented in which the wilting point is a function of the soilsalt content. At high salinity, the water content at wilting pointis higher than at low salinity, resulting in an insufficient amountof available water and, therefore, a reduced yield. The modelwas used to simulate several theoretical and experimentalsituations for forage corn and grain corn. Simulation resultsshowed that nitrogen fertilization increases the salinity thresholdvalue and the yield sensitivity (rate of yield reduction per unitof salinity). The also showed that forage corn is more sensitiveto salinity than grain corn. If the soil is not leached, a heaviersoil texture has a higher salinity threshold value. On the otherhand, if the soil is leached, the soil texture has no influence onthe salinity threshold value and the yield is less sensitive tosalinity in sandy soils. The determination coefficient (r2= 0.75) indicated that the results of the simulations were in goodagreement with the field data. 相似文献
5.
改性木质素对砖红壤磷素有效性的影响 总被引:5,自引:0,他引:5
磷肥施入砖土壤后,土壤速效磷随着时间的推移,呈现下降的趋势。利用改性木质素缓释磷铵,可以有效地络合土壤活性钵,降低其活性,从而阻止土壤速效磷被固定,使土壤磷素维持在较高的水平。土壤中交换性钙和交换性镁对土壤速效磷的影响不大。 相似文献
6.
Although preference for NH4+, NO3? or a combination of the two often differs among species, we know little about the responses of invasive plants to different inorganic N forms. Furthermore, many studies have suggested that an increase in N availability may facilitate further invasions. However, most of these studies predicted the positive feedback without considering the preference for N forms of invasive plants. Therefore, we cultivated four common invasive species (Mikania micrantha, Ipomoea cairica, Wedelia trilobata and Bidens pilosa) in South China with hydroponic media containing different forms of N (i.e. NO3?, NH4NO3 and NH4+) at equimolar concentrations. Our results showed that the N forms significantly affected the growth, biomass allocation and physiological traits of the plants. All four invasive plants supplied with NO3? alone had better performance and greater allocation to root biomass than did plants that were supplied with NH4+ alone. Moreover, the photosynthetic rate, pigment content and photosystem II activity of plants supplied with NO3? or NH4NO3 were significantly higher than those of plants supplied with NH4+alone. The results suggested that all four invasive plants preferred NO3? rather than NH4+, and changes in NO3? played an important role in furthering the invasions of these plants than did changes in NH4+. Our results implied that decreasing NO3? may be a useful tool for controlling and managing invasive plants preferring NO3?. In addition, this study highlighted the importance of considering plant N form preference to better understand plant invasions. 相似文献
7.
Abstract Condition indices are often used as surrogates of fish health, growth, and feeding and to compare ecological well-being among fish populations. In an effort to identify easily measured indices, growth and food consumption were compared with gonadal-somatic index, liver-somatic index (LSI), fat-somatic index and relative weight ( W r ) for ages 1–3 walleye, Sander vitreus (Mitchill), in Lake Erie from 1986 to 1988. The LSI and W r were significantly correlated with growth rate or food consumption, but correlations were too small to be considered biologically meaningful. Furthermore, no consistent relationships between condition indices and growth or consumption were found among combinations of fish age and season. None of the indices are considered reliable surrogates for more laborious estimates of growth and food consumption for Lake Erie walleye. Significant relationships between W r and relative abundance of key prey species warrant further investigation. 相似文献
8.
Two experiments were conducted with Florida pompano, Trachinotus carolinus L. at 3 and 28 g L?1 salinity to determine apparent crude protein digestibility (ACPD), energy digestibility (AED) and amino acid availability (AAAA) from soybean meal (SBM), soy protein isolate (SPI) and corn gluten meal (CGM). Mean AAAA was similar to ACPD. In fish adapted to 3 g L?1 salinity, they were 81.2% and 81.9% (CGM), 93.6% and 92.2% (SBM), 93.8% and 93.1% (SPI) for AAAA and ACPD respectively. In fish adapted to 28 g L?1, they were 84.5% and 83.4% (CGM), 86.5% and 87.1% (SBM), and 83.4% and 85.0% (SPI) for AAAA and ACPD respectively. The AED was highest for SPI and lowest for SBM and inversely related to carbohydrate. The ACPD, AED and AAAA of soy products appeared to be lower in high salinity, whereas CGM was unaffected. The data suggest that SBM, SPI and CGM should be further evaluated as partial fishmeal replacements in Florida pompano diets. Application of the generated coefficients can be used to develop well‐balanced, low‐cost diets for Florida pompano reared in low salinity or seawater. 相似文献
9.
This investigation examined the effects of live prey availability on growth and survival of Sepia officinalis. Two independent experiments, comprising two feed rations each, were performed, using adequate prey size. In the first experiment, cuttlefish hatchlings were fed live mysids, Paramysis nouvelli [(feed ratio I (fr I)], at 15% body weight per day (bw day?1) (fr I15) and 30% bw day?1 (fr I30). In the second experiment, juvenile cuttlefish were fed live Atlantic ditch shrimp, Paleomonetes varians (fr II), under the same experimental design. In both experiments, the final mean weight, feeding rate and instantaneous growth rate were higher when animals were fed feed ratio fr II15 and fr II30 (30% bw day?1). The results indicate that prey availability influenced weight gain, irrespective of the prey used, during the first 2 months of cuttlefish life cycle. This effect seems to be more noticeable when a certain limit of prey is achieved. For cuttlefish fed fr II, the optimal prey density is thought to be under 2.5 g prey L?1 (i.e. 14 shrimp L?1). Results indicate that cuttlefish can withstand prey densities up to 120 mysids L?1 for cuttlefish up to 3 weeks old and 19 shrimps L?1 for cuttlefish up to 6 weeks old. 相似文献
10.
A field experiment was conducted at Rani Chandramma Agricultural University (Arabhavi, Belgaum), Karnataka, India, in basic soil to study the nutrient availability in soil, yield and yield attributes of the medicinal plant stevia (Stevia rebaudiana). The results showed that the availability of nutrients such as nitrogen (N), phosphorus (P) and potassium (K) in the soil increased up to the fifth month; and thereafter, decreased by the same amount with the progress of the plant growth up to the sixth month, irrespective of treatments. Results also showed that the fresh and dry biomass yields significantly increased up to the sixth month with different treatments, but the yield attributes like plant height and the number of branches were observed to be varied with various treatments, being highest in the combined application of biofertilizers over that of their corresponding sole applications. 相似文献