全文获取类型
收费全文 | 152117篇 |
免费 | 9530篇 |
国内免费 | 14714篇 |
专业分类
林业 | 10334篇 |
农学 | 8239篇 |
基础科学 | 7273篇 |
16047篇 | |
综合类 | 74322篇 |
农作物 | 10437篇 |
水产渔业 | 6035篇 |
畜牧兽医 | 24082篇 |
园艺 | 12051篇 |
植物保护 | 7541篇 |
出版年
2024年 | 1375篇 |
2023年 | 3297篇 |
2022年 | 7344篇 |
2021年 | 7144篇 |
2020年 | 6562篇 |
2019年 | 6596篇 |
2018年 | 4863篇 |
2017年 | 7292篇 |
2016年 | 4763篇 |
2015年 | 7519篇 |
2014年 | 8017篇 |
2013年 | 9332篇 |
2012年 | 12932篇 |
2011年 | 13339篇 |
2010年 | 12892篇 |
2009年 | 11355篇 |
2008年 | 11270篇 |
2007年 | 10290篇 |
2006年 | 8295篇 |
2005年 | 6477篇 |
2004年 | 4226篇 |
2003年 | 2621篇 |
2002年 | 2559篇 |
2001年 | 2458篇 |
2000年 | 2200篇 |
1999年 | 768篇 |
1998年 | 64篇 |
1997年 | 53篇 |
1996年 | 27篇 |
1995年 | 42篇 |
1994年 | 47篇 |
1993年 | 36篇 |
1992年 | 47篇 |
1991年 | 34篇 |
1990年 | 22篇 |
1989年 | 13篇 |
1988年 | 8篇 |
1987年 | 28篇 |
1986年 | 26篇 |
1985年 | 2篇 |
1984年 | 1篇 |
1981年 | 22篇 |
1966年 | 1篇 |
1965年 | 3篇 |
1962年 | 35篇 |
1958年 | 1篇 |
1956年 | 42篇 |
1955年 | 21篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
931.
Proteomic analysis of pathogen-responsive proteins from maize stem apoplast triggered by Fusarium verticillioides
下载免费PDF全文
![点击此处可从《农业科学学报》网站下载免费的PDF全文](/ch/ext_images/free.gif)
During the attack of a pathogen, a variety of defense-associated proteins are released by the host plant in the apoplast to impede the perceived attack. This study utilized the mass spectrometry(LC-MS/MS) and label-free quantification method to analyze the apoplastic fluid(APF) from maize stalk and identified the proteins responsive to the Fusarium verticillioides infection. We have identified 742 proteins, and among these, 119 proteins were differentially accumulated(DAPs), i.e., 35 up-regulate... 相似文献
932.
Dynamics of organic carbon and nitrogen in deep soil profile and crop yields under long-term fertilization in wheat-maize cropping system
下载免费PDF全文
![点击此处可从《农业科学学报》网站下载免费的PDF全文](/ch/ext_images/free.gif)
Muhammad QASWAR LI Dong-chu HUANG Jing HAN Tian-fu Waqas AHMED Sehrish ALI Muhammad Numan KHAN Zulqarnain Haider KHAN XU Yong-mei LI Qian ZHANG Hui-min WANG Bo-ren Ahmad TAUQEER 《农业科学学报》2022,21(3):826-839
Soil organic carbon(SOC) and nitrogen(N) are two of the most important indicators for agricultural productivity. The primary objective of this study was to investigate the changes in SOC and N in the deep soil profile(up to 100 cm) and their relationships with crop productivity under the influence of long-term(since 1990) fertilization in the wheat-maize cropping system. Treatments included CK(control), NP(inorganic N and phosphorus(P) fertilizers), NPK(inorganic N, P and potassium fertilizers),... 相似文献
933.
Expression profiles and functional prediction of ionotropic receptors in Asian corn borer,Ostrinia furnacalis (Lepidoptera: Crambidae)
下载免费PDF全文
![点击此处可从《农业科学学报》网站下载免费的PDF全文](/ch/ext_images/free.gif)
Genes involved in chemosensation are essential for odorant-mediated insect behaviors. Odorant receptors(ORs) bind and respond to pheromones and plant volatiles, regulating insect behaviors such as mating and host-plant selection, while ionotropic receptors(IRs), which are present at lower levels in insects than ORs, influence ion channels, especially in agricultural pests. Asian corn borer, Ostrinia furnacalis, is the main pest of maize that causes huge economic losses in Asia. Twenty-one Ofur I... 相似文献
934.
Effects of grape seed extract on meat color and premature browning of meat patties in high-oxygen packaging
下载免费PDF全文
![点击此处可从《农业科学学报》网站下载免费的PDF全文](/ch/ext_images/free.gif)
YANG Xiao-yin XU Bao-chen LEI Hong-mei LUO Xin ZHU Li-xian ZHANG Yi-min MAO Yan-wei LIANG Rong-rong 《农业科学学报》2022,21(8):2445-2455
This study investigated the effects of grape seed extract(GSE) on fresh and cooked meat color and premature browning(PMB) in ground meat patties(85% beef and 15% pork back fat) packaged under high-oxygen modified atmospheres(HiOx-MAP). The GSE was added to patties at concentrations of 0, 0.10, 0.25, 0.50 and 0.75 g kg–1. This study evaluated the surface color, pH, lipid oxidation, and total viable counts(TVC) of raw patties, and the internal color and pH of patties cooked to a tempera... 相似文献
935.
LIU Jian-long ZHANG Chen-xiao LI Tong-tong LIANG Cheng-lin YANG Ying-jie LI Ding-Li CUI Zhen-hua WANG Ran SONG Jian-kun 《农业科学学报》2022,21(5):1346-1356
Close planting of dwarf varieties is currently the main cultivation direction for pear trees,and the screening of excellent dwarf varieties is an important goal for breeders.In this study,the dwarfing pear variety ’601D’ and its vigorous mutant ’601T’ were used to show their biological characteristics and further explore the dwarfing mechanism in ’601D’.The biological characteristics showed that ’601D’ had a shorter internode length,a shorter and more compact tree body,thicker and broader leaves... 相似文献
936.
Transcriptome analysis of the spleen of heterophils to lymphocytes ratio-selected chickens revealed their mechanism of differential resistance to Salmonella
下载免费PDF全文
![点击此处可从《农业科学学报》网站下载免费的PDF全文](/ch/ext_images/free.gif)
937.
Predicting soil depth in a large and complex area using machine learning and environmental correlations
下载免费PDF全文
![点击此处可从《农业科学学报》网站下载免费的PDF全文](/ch/ext_images/free.gif)
Soil depth is critical for eco-hydrological modeling, carbon storage calculation and land evaluation. However, its spatial variation is poorly understood and rarely mapped. With a limited number of sparse samples, how to predict soil depth in a large area of complex landscapes is still an issue. This study constructed an ensemble machine learning model, i.e.,quantile regression forest, to quantify the relationship between soil depth and environmental conditions. The model was then combined with ... 相似文献
938.
Genome-wide association and linkage mapping strategies reveal genetic loci and candidate genes of phosphorus utilization in soybean
下载免费PDF全文
![点击此处可从《农业科学学报》网站下载免费的PDF全文](/ch/ext_images/free.gif)
ZHANG Hua WU Hai-yan TIAN Rui KONG You-bin CHU Jia-hao XING Xin-zhu DU Hui JIN Yuan LI Xi-huan ZHANG Cai-ying 《农业科学学报》2022,21(9):2521-2537
Insufficient available phosphorus in soil has become an important limiting factor for the improvement of yield and quality in soybean. The mining of QTLs and candidate genes controlling soybean phosphorus utilization related traits is a necessary strategy to solve this problem. In this study, 11 phosphorus utilization related traits of a natural population of 281 typical soybean germplasms and a recombinant inbred line(RIL) population of 270 lines were evaluated under different phosphorus condit... 相似文献
939.
940.
为了快速筛选出适应四川生态环境的高油酸花生品种,发掘优质的高油酸资源,进而促进四川高油酸花生产业发展。以16份本地及引进的高油酸花生品种为材料,用调查取样及数据分析法比较以上品种在经济学性状、产量、生长特点、抗性及单株产量等方面的表现。‘中花415’、‘冀花13’、‘豫花37’、‘开农1760’和‘冀花16’在荚果大小、饱果率、出仁率、百仁重、产量、口感等性状上表现优良‘;中花415’、‘豫花37’、‘花育961’、‘冀花13’、‘冀花16’在分枝数、出苗率、长势、抗性等方面综合表现优良;‘开农1760’、‘冀花13’、‘冀花16’、‘豫花37’、‘中花415’在单株总果数、饱果数、饱果率和单株产量上综合表现优异。对‘冀花13’‘、冀花16’‘、豫花37’‘、中花415’表现优良的外引材料将作进一步示范推广,省外引进的品种需要一定时间适应四川本土的环境气候。 相似文献