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41.
B. R. M. Rao R. S. Dwivedi K. Sreenivas Q. I. Khan K. V. Ramana S. S. Thammappa M. A. Fyzee 《Land Degradation \u0026amp; Development》1998,9(4):357-367
Information is presented on the nature, extent and spatial distribution of waterlogged areas and salt-affected soils, derived through systematic visual interpretation of standard false colour composite (FCC) prints on a 1:100 000 scale generated from the Indian Remote Sensing Satellite (IRS-1B) Linear Imaging Self-scanning Sensor (LISS-I) and Landsat–Thematic Mapper (TM) data for the Nagarjunsagar Right Bank Canal Command Area, Andhra Pradesh. A total of 1710 ha of land in the coastal region has been found to be waterlogged. Salt-affected soils cover an area of 42 800 ha, with saline–sodic soils covering 28 480 ha emerging as the dominant category. To make optimal use of these lands and to prevent further degradation both preventive and ameliorative measures have been advocated. © 1998 John Wiley & Sons, Ltd. 相似文献
42.
通过对高等院校开展专门用途英语(ESP)教学的必要性分析,提出了大学英语教学改革的方向是逐步将重心偏向于ESP教学。针对当前农业院校ESP课程设置的现状,从课程定位、教学内容及安排、师资构成及教学模式几个方面探讨了农业院校ESP课程设置的关键环节,以期实现培养学生在一定学科背景下运用英语开展研究或工作的交际能力的教学目标。 相似文献
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There is growing global demand for medicinal drugs including isabgol (Plantago ovata). With increasing demand of food for an ever‐increasing population in India, it is not possible to bring arable lands under cultivation for aromatic and medicinal plants. Salt‐affected lands (both saline and alkali) occupy about 8·6 million ha. Due to poor physical properties and excessive exchangeable Na+, most of these lands do not support good vegetation cover. The marginal and salt‐affected lands could be successfully utilized for the cultivation of aromatic and medicinal plants. We achieved almost complete germination of isabgol seeds using up to 5000 ppm salt‐solution. Grain yield (including husk) was 1·47 to 1·58 t ha−1 at pH 9·2 showing no significant yield reduction as compared to normal soil. At pH 9·6 the grain yield was 1·03 to 1·12 t ha−1. At higher pH there was significant reduction in yield. Sowing in good moisture (at field capacity) of soil was found best, but to save time sowing at shallow depth in dry soil, followed by irrigation was also suitable as compared to broadcasting seeds. The chlorophyll content was greater 70 days after sowing compared to younger stages (50 days after sowing). The total chlorophyll and plant biomass were lower from crops grown by broadcasting methods of sowing as compared to two other methods of sowing. The leaf area index (LAI) was higher for the broadcasting method of sowing as compared to the other two methods. Na+ absorption increased and K+ and K+/Na+ ratio decreased with increase in pH. Results reported in this paper clearly indicate that isabgol can successfully be grown on moderately alkali soils up to pH 9·6 without the application of any amendment. Copyright © 2006 John Wiley & Sons, Ltd. 相似文献
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当前我国大学外语教学存在诸多问题,实现外语教学的跨学科发展是社会发展的需要,是当前大学英语教学改革的重要方向。针对当前我国农业院校外语教学的现状以及存在的问题,提出几个改善途径:重视ESP课程教学、调整课程设置、改革教学内容、方法与模式、加强师资队伍建设,培养学生用英语在专业领域内进行研究和工作的能力,从根本上提升我国农业人才的国际竞争力。 相似文献