全文获取类型
收费全文 | 151篇 |
免费 | 4篇 |
专业分类
林业 | 15篇 |
农学 | 14篇 |
基础科学 | 2篇 |
51篇 | |
综合类 | 7篇 |
农作物 | 8篇 |
水产渔业 | 9篇 |
畜牧兽医 | 32篇 |
园艺 | 8篇 |
植物保护 | 9篇 |
出版年
2023年 | 3篇 |
2022年 | 5篇 |
2021年 | 8篇 |
2020年 | 3篇 |
2019年 | 4篇 |
2018年 | 12篇 |
2017年 | 10篇 |
2016年 | 11篇 |
2015年 | 5篇 |
2014年 | 9篇 |
2013年 | 17篇 |
2012年 | 12篇 |
2011年 | 11篇 |
2010年 | 8篇 |
2009年 | 2篇 |
2008年 | 6篇 |
2007年 | 4篇 |
2006年 | 5篇 |
2005年 | 2篇 |
2004年 | 1篇 |
2003年 | 2篇 |
2002年 | 1篇 |
2001年 | 1篇 |
2000年 | 1篇 |
1998年 | 1篇 |
1997年 | 1篇 |
1993年 | 2篇 |
1986年 | 1篇 |
1985年 | 2篇 |
1982年 | 1篇 |
1976年 | 1篇 |
1969年 | 1篇 |
1967年 | 2篇 |
排序方式: 共有155条查询结果,搜索用时 93 毫秒
151.
Sudan M 《Science (New York, N.Y.)》2003,301(5637):1191-1192
152.
P. Kumara R. Prasad D. K. Gupta A. K. Vishwakarma A. Choudhary 《Russian Agricultural Sciences》2017,43(6):461-465
Microwave remote sensing sensors have great potential due to their capability to operate in any weather condition for the wide range of agricultural applications. The rice crop variables such as leaf area index (LAI) and plant height (PH) were retrieved for the monitoring of crop growth to improve crop production. The interaction of rice crop variables with medium spatial resolution (25 m) Radar Imaging Satellite-1 (RISAT-1) data for Varanasi district, India, was examined. The multi-temporal dual polarization (HH- and HV-) images having frequency 5.35 GHz at C-band were investigated. Crop growth profile derived from the analysis of temporal backscattering (July–October, 2013) showed 3–4 dB difference throughout its growth cycle. The rice crop variables were retrieved by the inversion of polynomial models and showed higher values of coefficient of determination (R2) for HH-polarization in comparison to HV-polarization. 相似文献
153.
Relationship of temperament with oestrous behaviour,resumption of ovarian cyclicity and milk yield in post‐partum Murrah buffaloes
下载免费PDF全文
![点击此处可从《Reproduction in domestic animals》网站下载免费的PDF全文](/ch/ext_images/free.gif)
KK Choudhary A Bharadwaj RK Sharma A Jerome S Khanna 《Reproduction in domestic animals》2017,52(6):962-968
This study was designed to investigate the relationship of temperament with oestrus, resumption of ovarian cyclicity and milk yield in post‐partum buffaloes. For this study, 102 post‐partum Murrah buffaloes were observed for temperament in open paddock and during milking. Based on the temperament score (1–5 score), they were classified into docile, slightly restless, restless, aggressive and nervous. Oestrous behaviour was monitored twice daily in all the buffaloes along with milk yield (weekly), body weight (BW) and body condition score (BCS) at day 0, 30, 60 and 90 post‐partum. Based on the temperament score, the number of buffaloes classified as docile, slightly restless, restless and aggressive was 37 (36.27%), 28 (27.45%), 30 (29.41%) and 7 (6.86%), respectively, but none under nervous category. Number of buffaloes resuming cyclicity in various temperaments groups were as follows: docile (n = 35; 94.59%), slightly restless (n = 22; 78.57%), restless (n = 20; 66.67%) and aggressive (n = 7; 85.71%). Temperament was not correlated (p = .128; r=?.152) with oestrous behaviour. But, temperament was correlated (p < .0001; r = .384) with the resumption of cyclicity as docile and slightly restless buffaloes resumed cyclicity (p < .0016) earlier. Temperament of buffaloes was weakly correlated (p = .0017; r=?.306) with milk production with higher (p < .0358) total milk yield in docile (1022 ± 23.75 kg) and slightly restless buffaloes (948 ± 35.86 kg) as compared to other temperament groups. In summary, temperament of post‐partum buffaloes was related with resumption of ovarian cyclicity and milk yield, but not oestrous behaviour. 相似文献
154.
Shaminder Singh Chahal O. P. Choudhary Manpreet Singh Mavi 《Communications in Soil Science and Plant Analysis》2018,49(11):1266-1280
Most important, yet least understood, question, how microbial activity in soil under saline water irrigation responds to carbon (C) varying qualitatively (most labile form to extreme recalcitrant form) with or without maintaining C/N ratio was investigated in an incubation experiment. Soil samples from a long-term saline-water (electrical conductivity, EC ≈ 0, 6, and 12 dS m?1)- irrigated field were incorporated with three different C substrates, viz., glucose, rice straw (RS), and biochar with or without nitrogen (N as ammonium sulfate, NH4SO4) and were incubated at 25 °C for 56 days. Cumulative respiration (CR), microbial biomass carbon (MBC), microbial biomass nitrogen (MBN), and dehydrogenase activity (DEA) concentrations decreased with increasing EC (P < 0.05), but less so in soils amended with glucose followed by RS and biochar. The addition of N to soils amended with different C substrates significantly decreased CR, MBC, DEA, and available phosphorus (P) concentrations at a given EC level. 相似文献
155.
Kumar Antul Sharma Achla Sharma Rajni Choudhary Anuj Srivastava Puja Kaur Harmanjot Padhy Asish Kumar 《Genetic Resources and Crop Evolution》2022,69(1):411-430
Genetic Resources and Crop Evolution - Gradual deterioration in water resources and unpredictable distribution pattern of annual precipitation amount are major threats having drastic effects on... 相似文献