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1.
基于生物技术的集约农业—未来农业的希望 总被引：1，自引：0，他引：1
Future challenges of agriculture inevitably demand knowledge and technology based revitalization of farm-ing. A strategic and rational resource management approach has to be adopted for achieving the productivity enhancement goals without compromising on natural resources. Intensive fanning system characterized by intensive use of chemical inputs, though made it possible to significantly increase the productivity during 20th century assuring proper food for the growing population, created several health and environmental concerns, compromised on crop quality and has become cost intensive. Its potential is exhausted. However, these problems are not the inevitable consequences of intensive fanning system. These problems can be readdressed and their intensity can be alleviated by shifting-over to “Biotechnological-intensive Fanning System“. Biotechnology and genetic transformation techniques in combination with conventional breeding methods can produce better quality and high yielding novel crops with enhanced nutritional level, resistant to biotic and abiotic stresses leading to less use of chemicals thereby lowering the production cost and ameliorating the problems affiliated with intensive fanning system. Biotechnological-intensive Fanning System has a greater potential to meet the future challenges of food production in 21^st century for burgeoning population. It is compatible with the objective of integrated resource management for sustainability of agricultural resource foundation and is human and environment friendly. Combiningbiotechnological innovations and genetic modification of crops with fanning under a suitable policy framework is our best hope for the future. 相似文献
2.
基于适度人口容量的新型城镇化发展分析——以宁夏5个地级市为例 总被引：1，自引：1，他引：0
通过构建经济承载力、土地承载力、可供水资源承载力、建设用地承载力与生态环境承载力人口容量模型综合测度研究区5市理论城镇化发展水平,从而与实际城镇化发展水平进行对比分析。结果表明：（1）银川市与石嘴山市实际城镇化发展水平高于理论城镇化发展水平,且城市人口潜力指数大,具有吸纳外来人口的能力;（2）吴忠市、中卫市和固原市实际城镇化水平低于理论城镇化水平,城镇化发展水平偏低,且人口潜力指数较小,不具备吸纳外来人口的能力。以此为依据,为不同人口密度等级区新型城镇化发展提出相应的对策与建议：（1）对于人口极密集区与密集区,一方面应加强中心城市的辐射带动能力,另一方面加强政府引导作用,推动人口市民化进程与城市空间协调发展;（2）对于人口中等区,一方面,加强中心城市的拉力作用,另一方面,创造农村推力作用,着力解决城镇化过程中流动人口的“后顾之忧”;（3）对于人口稀少与极稀区,一方面应鼓励就地城镇化,另一方面要打破城乡二元结构,促进本区域城镇化发展水平。 相似文献
3.
Jonathan Rigg 《Asia Pacific viewpoint》2005,46(2):173-184
Abstract: Drawing on Harold Brookfield's seminal interventions on intensification and disintensification in tropical agriculture, the paper argues that a de‐linking of poverty and livelihoods in rural areas from farming and agricultural resources is occurring in rural South‐East Asia. This is often driven as much by changes in lifestyles and life views than by economic and environmental imperatives. The paper proposes that farming is in the process of losing its resonance and significance for the rural poor. Emerging patterns of change in the South‐East Asian countryside are used to construct a generalised framework of agrarian transition where the current trend towards pluriactivity is likely to be replaced by a mixed landscape of agrarian entrepreneurs, neopeasants and remnant smallholders. The paper concludes by reflecting on the implications of this trajectory for understanding poverty and pro‐poor interventions in the countryside. 相似文献
4.
5.
为了了解农村流动人口对农业经济的影响,维护区域粮食安全,以上海市为例,依据1992—2012年上海市种植业、林业、畜牧业、渔业的总产值和农村流动人口数据,采用灰色关联度和改良道格拉斯生产函数分析对农村流动人口与种植业、林业、畜牧业、渔业的关系以及农村流动人口对种植业、林业、畜牧业、渔业的贡献度进行分析。结果表明农村流动人口与4 个子行业的关联度都非常高,对种植业和畜牧业贡献值为正,对林业和渔业贡献值为负。在此基础上,建议引导农村流动人口向种植业和畜牧业流动将有利于农业经济发展。 相似文献
6.
Challenging targets for future agriculture 总被引：9，自引：0，他引：9
This article points out the kinds of problems agriculture is facing, outlines and structures agricultural quality components and defined aims for them, discusses the shortcomings of organic farming, proposes some important research areas and presents an outlook. The quality components are a type of checklist of those factors that we should be aware of concerning protection of the environment, production of healthy food and the practice of good ethics. These components can be integrated into the general aims of sustainable agriculture. Many European and other countries focus on organic farming as a solution, but this approach is dangerous because it does not necessarily lead to a better environment or better food products. Concerning future agricultural research, the following issues are highly important: precision agriculture, low leaching cropping systems, management of soil biological processes and maximum recirculation. Finally, the article discusses some issues of future agriculture such as intensity, nutrient imbalances caused by regional farm specialisation, and the development of an agricultural quality assessment system. 相似文献
7.
干旱区村域种植业生产效益影响因素研究——以新疆奇台县三屯村为例 总被引：1，自引：1，他引：0
为了对干旱区村域种植业生产效益影响因素进行研究,以旱地区生态脆弱的奇台县西北湾乡三屯村为例,通过实地调查和入户问卷调研与访谈获取研究数据,利用回归分析方法,分析种植业成本构成及关键成本、成本与土地种植面积对种植业收益的影响、作物种植类型对种植业收益的影响。结果表明：打井成本和作物种植成本是影响农户种植业生产总成本的重要因素;种植业生产属于资本密集型,地租、作物种植成本和打井费用是影响种植业收益的主要因素;种植业属于粗放的土地资源依赖型,承包土地面积扩张是影响农民种植业收益的主要方式;小麦种植是农户的种植业的主要收益来源。 相似文献
8.
Michael Sofer 《Asia Pacific viewpoint》2007,48(2):234-249
Abstract: This paper deals with some major economic issues concerning the Pacific plant kava, known in Fiji as yaqona. The plant is the source of the cerebral depressant beverage found throughout many of the Pacific Islands, which besides its daily use plays an important ceremonial and social role in the indigenous culture. This paper deals with yaqona cultivation and commercialisation in the Fijian peripheral island of Kadavu, from a perspective of more than 20 years. The findings suggest that the role of the plant as a major cash crop is even more important than it was in the first half of the 1980s. Moreover, the village semi‐subsistence economy has become increasingly dependent on this crop as part of its survival strategy. The explanations offered are related to physical and ecological conditions and the associated agrotechnical advantages in Kadavu; marketing advantages and worsening terms of trade experienced by the Fijian periphery; and the lack of other economic opportunities in peripheral areas of Fiji, such as Kadavu – in turn, a function of core–periphery relationships. This is a response of the periphery to the increasing marginalisation within the Fiji state and may imply villagers' and communities' acceptance of their marginal position in the economy. 相似文献
9.
Striga hermonthica is a major constraint in the subsistence agriculture regions of northern Ethiopia. Low soil fertility and overall environmental degradation has contributed to the build up of the parasitic weed infestation. Improved cropping systems have to be introduced to address the interrelated problems of Striga and soil fertility decline. Thus, relay cropping of sorghum with legume shrubs was investigated at two locations representing different environments. Results showed that the output of the improved cropping system was dependent on ecological endowments. Relay cropping led to significant improvement in yield at Sheraro, at the site with relatively better weather and soil conditions. The legume shrubs resulted in significantly lower sorghum yield in a dryland location (Adibakel). Overall Striga infestation declined over the 3‐year period; however, treatment differences were not apparent. Among the two legume shrubs, Sesbania sesban was better adapted to the dryland areas. Relay cropping could provide a viable option for farmers in both types of environments that are characterized by accelerated decline in natural resource base. However, it could mean compromising the yield of non‐fertilized sorghum in the interest of long‐term benefits of low incidence of Striga and more rewarding crop enterprise in dry areas. 相似文献
10.
Long‐term crop rotation trials were designed to assess sustainability of alternatives to traditional fallow and monocropping. The trial described here (6 years) involved wheat (Triticum aestivum L.) in rotation with lentil (Lens culinaris L.), forage vetch (Vicia sativa), pasture medic (Medicago spp.), fallow and watermelon (Citrullus vulgaris). Barley (Hordeum vulgare L.) was compared with wheat for an additional 2 years. Cereal grain and straw yields were highest with fallow and watermelon followed by vetch, lentil and medic; the latter showed no differential effect of variable grazing intensity. Fertilizer N increased yields except in the low‐rainfall years (less than 250 mm). Barley out‐yielded wheat in terms of grain, but not straw. Medic yielded highest in dry matter, whereas lentil produced highest seed yield. Despite the difficulty of assessing crop and animal‐oriented rotations because of non‐commonality of outputs, economic considerations are foremost, but other benefits of rotations (soil quality, water‐use relations) are also relevant to the overall assessment of cereal‐based Mediterranean rotations. The study suggested barley rather than wheat as the desired cereal in rotation with legumes in this marginal‐rainfall (350 mm) environment and provided support for the viability of vetch and lentil in the cropping system. Given the importance of sheep in the region’s farming system, vetch is likely to have a major role in crop rotations. 相似文献
11.
西南地区乡村衰落具体表现及诱发问题研究 总被引：1，自引：0，他引：1
为研究乡村衰落问题,以重庆3个村庄为研究对象,采用案例分析的方法对西南山区乡村衰落进行研究。调研发现,受地理地貌、生产条件、居住方式等条件制约,西南地区乡村衰落的现象与问题更加突出,表现出人口大量外流、耕地撂荒增加、农房闲置率提高、务农人员老龄化、农民务农意不高、农业经营收入占家庭收入比重下降、义务教育外移、村自治组织弱化等多重现象,并诱发了严重的乡村养老问题、农业产业发展问题、乡村治理问题和乡土文明断裂问题。研究提出,推进乡村振兴,应充分考虑地区差异,因地施策;应重视乡土文化和乡村养老问题;应激活农村资源,丰富农业形态,兴旺农村经济。 相似文献
12.
浙北平原创新发展农业循环经济模式选择和对策 总被引：2，自引：0，他引：2
发展农业循环经济是实现农业农村可持续发展的必然选择。本文分析了浙北平原创新发展农业循环经济的几种典型模式：如“生猪-沼气-沼液、有机肥-蔬菜、林果”循环农业模式;稻草、谷壳、河泥-种植蘑菇-蘑菇渣泥废弃物-种植大棚芦笋（或西瓜、蔬菜、黄桃等）”循环农业模式;“水稻-桑枝条培养黑木耳-废弃菌棒还田（或桑果园）”循环农业模式等,最后就加快发展新型农业循环经济提出对策与建议。 相似文献
13.
Barley is one of the most popular crops in dryland agricultural systems of Mediterranean areas, where it is assumed that barley, or traditional wheat cultivars, performs better than modern wheat under low‐yielding conditions. It was tested whether variations in net leaf photosynthetic rate (PN) during grain filling provide any basis for the potential better performance of barley and traditional wheat compared to modern wheats in Mediterranean areas. Two groups of field experiments were conducted in Agramunt (NE Spain) during 2005/06 (06) and 2006/07 (07) growing seasons combining low and high nitrogen (N) availabilities under rain‐fed and irrigated conditions. Cultivars used in the first group of experiments were a traditional (Anza) and a modern (Soissons) wheat, whilst in a second group of experiments, a wheat (Soissons) and a barley (Sunrise) modern cultivars were used. Both wheat cultivars showed a similar PN during grain filling but higher than that of the modern barley cultivar. Differences between species in PN were maximized under high‐yielding conditions. There were no differences between cultivars in instantaneous water‐use efficiency. The barley cultivar showed a higher specific leaf area, but lower N content per unit of leaf area, than wheat. Photosynthetic nitrogen‐use efficiency was similar between the traditional and the modern cultivar but lower than barley. Decreases in PN after anthesis were not exactly observable in SPAD measurements. In conclusion, we found no consistent differences between cultivars in terms of post‐anthesis photosynthetic activity to support the assumption of better performance under Mediterranean farm conditions of traditional wheat or barley against modern wheat. 相似文献
14.
Improving the land-use efficiency (LUE) of farming systems could satisfy increasing global food, feed, biomass and bioenergy demand in a sustainable manner. This study presents a new method for calculating LUE, beginning with an overview of different approaches to assessing agricultural LUE. This new method takes into account the quality and function of agricultural products and the relationship between the yield of the assessed farm and the average yield of the reference region with comparable soils, climate and socio-economic conditions.The new approach was tested using data from long-term experiments at the Scheyern Research Farm in southern Germany, which include different farming systems (organic mixed farming, arable farming, and agroforestry; conventional arable farming and agroforestry). In our case studies, the LUE of conventional systems (arable farming: 1.00; improved arable farming: 1.06; agroforestry: 0.98) was higher than those of the organic systems (mixed farming: 0.69; arable farming: 0.33; agroforestry: 0.43) due to different crop rotations, dry matter yields, and biomass usage (harvest ratio). The conversion of high-input arable farming systems (conventional farming) to agroforestry systems is an extensification with negative effects on the dry matter yield and land-use efficiency. Nevertheless, the conversion to agroforestry systems can increase dry matter yield and land-use efficiency in low-input arable farming systems (organic farming). LUE should be used in combination with agri-environmental indicators, in order to ensure both efficient and sustainable land use. 相似文献
15.
中国南部丘陵山区包括有19个省市区总面积约310万km2,耕地约0.34亿hm2,人口4亿多。这里资源丰富,但灾害频繁,生产潜力大。存在问题主要是科技投入少,基础建设投入不足,农民文化素质差,直接为丘陵山区服务的科研成果不多。该地区农业生产发展目标主要是：以市场为导向,以科学化化为中心,在确保粮食增产和安全的前提下,发展多种多样的、效益好、品质优的特色农牧业产业带,保证农牧民增产增收,并不断向品牌化、标准化、精品化和持续化方向发展。今后,首先要坚持把弘扬“科学文化”作为“农业科技入户示范工程”的主旋律,科学技术首先是一种文化,它将促进农牧民从科学世界观高度认识生产。因此,它是丘陵山区发展的先导。其次,要坚持拓展和丰富该地区物质性与社会性并重的农村基础工程建设。此外,还应对该地区的农田保护与“三农”关系,以及立体农业、庭院经济等问题拓展思路,丰富其内涵。 相似文献
16.
In a field trial involving four tepary lines (Phaseolus acutifolius A. Gray), NE#8A and NE#19 produced higher grain yield than NE#5 and NE#7 under both well watered and drought conditions. However, NE#8A is considered more resistant than NE#19 in terms of drought sensitivity index. Greenhouse investigations on intact plants indicated no differences among the four lines in leaf and stem dry mass, and leaf area. Root depth did not strictly differentiate lower‐yielding from higher‐yielding lines. In contrast to lower‐yielding lines, however, plants of higher‐yielding ones allocated greater dry matter (DM) in roots in response to imposed water stress. Distinctly, NE#19 had the greatest root : shoot (R : S) while NE#8A characterized by high net photosynthesis. Both NE#8A and NE#19 showed reduced leaf area : root dry mass ratio, stomata conductance and transpiration rate. Consequently, these two lines showed no significant changes in leaf relative water content while photosynthetic water‐use‐efficiency increased in response to water stress. Calli derived from leaf and root tissues of higher‐yielding lines exhibited low initial osmotic potential (ψs). These calli did not show alterations in ψs, DM% and relative growth rate (RGR) when subjected to water stress. Although leaf‐ and root‐derived calli of lower‐yielding lines exhibited osmotic adjustment, they suffered water stress in terms of elevated DM and reduced RGR. Overall, results suggest that dehydration‐avoidance mechanisms conditioned by increased root mass and stomata resistance accompanied with low initial cellular ψs sustained high grain yield of tepary under limited water supply. 相似文献
17.
In arid and populated areas or countries, water shortage and heavy carbon emissions are threatening agricultural sustainability with food security severely, and becoming a major issue. It is unclear whether improved farming systems can be developed to tackle those issues through a sustainable agriculture. Here three farming practices that have proven to be essential and successful, which were: (a) crop intensification through strip intercropping, (b) water harvesting through conservation tillage; and (c) carbon sequestration through improved crop residue management options, were integrated in one cropping system. We hypothesize that the integrated system allows the increase of crop yields with improved water use efficiency, while reducing carbon emissions from farming. The hypothesis was tested in field experiments at Hexi Corridor (37°96′N, 102°64′E) in northwest China. We found that the integrated system increased soil moisture (mm) by 7.4% before sowing, 10.3% during the wheat–maize co-growth period, 8.3% after wheat harvest, and 9.2% after maize harvest, compared to the conventional sole cropping systems. The wheat/maize intercrops increased net primary production by 68% and net ecosystem production by 72%; and when combined with straw mulching on the soil surface, it decreased carbon emissions by 16%, compared to the monoculture maize without mulch. The wheat/maize intercrops used more water but increased grain yields by 142% over the monoculture wheat and by 23% over the monoculture maize, thus, enhancing water use efficiency by an average of 26%. We conclude that integrating strip intercropping, conservation tillage as well as straw mulching in one cropping system can significantly boost crop yields, improve the use efficiency of the limited water resources in arid areas, while, lowering the carbon emissions from farming. The integrated system may be considered in the development of strategies for alleviating food security issues currently experienced in the environment-damaged and water-shortage areas. 相似文献
18.
Livelihood diversification with certification‐supported farming: The case of land reform beneficiaries in the Philippines 
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下载免费PDF全文 Rie Makita 《Asia Pacific viewpoint》2016,57(1):44-59
The promotion of intensive farming through organic and fair trade certification appears contradictory to the increasing significance of non‐farm income sources in rural Asia as well as in many other parts of the rural South. By observing a sugarcane producer co‐operative comprising land reform beneficiaries in the Philippines, this paper explores the reality of livelihood diversification as practised by member households of the certified co‐operative, focusing on the compatibility of certification‐supported farming with diversified activities. In this case, diversification at the household level progressed both away from farming and into farming. Behind the long‐term use of agricultural certification, there are compelling reasons for continuing both certification‐supported farming and diversified activities, and for employing mechanisms that further the compatibility at all phases between the former and the latter, and maximising income‐generating opportunities. The operation of communal land with agricultural certification may be an effective form of assistance to land reform beneficiaries who share a strong desire to be landowners. 相似文献
19.
A plastic‐covered ridge and furrow farming of rainfall collecting (RC) system were designed to increase water availability to corn for improving and stabilizing agricultural production in the semiarid Loess region of northwest China. This system comprised two elements: the ridge mulched by plastic film that acts as a rainfall harvesting zone and the furrow as a planting zone. To adopt this system for large‐scale use in the semiarid region and bring it into full play, it is necessary to test the appropriate rainfall range for RC farming. A field study (using corn as an indicator crop) combined with rainfall simulation was conducted to determine the effect of RC on soil moisture, root characteristic parameters and the yield of corn under three different rainfall levels (230, 340 and 440 mm) during the growing seasons of 2006 and 2007. The results indicated that with the rainfalls ranging within 230–440 mm, the soil moisture at 0–100 cm depth for RC system in furrows was significantly higher (P < 0.05) than that of conventional flat (CF for control) practice. At 100–200 cm soil depth, there was no significant difference (P > 0.05) between soil moisture in the RC230 plots and in the CF230 plots during the corn growing seasons, while the soil moisture both in the RC340 and RC440 plots were significantly higher (P < 0.05) than those in the CF340 and CF440 plots. The root length, root surface area, root volume and root dry weight for RC230 and RC340 plots all significantly increased (P < 0.05) compared with CF230 and CF340 plots, but these root characteristic parameters at 440 mm rainfall slightly decreased compared with those of CF practice. Compared with the CF230–440 pattern, the increasing amplitude of grain yield under the RC230–440 pattern diminished with the rainfall increase and there was no obvious yield‐incrementing effect (P > 0.05) between two patterns at 440 mm rainfall in 2006. In comparison with these two farming practices, the RC system not only improved soil moisture of dry farmland, but also promoted the development of corn root systems when the rainfall ranged between 230 and 440 mm. Thus, it could be concluded that the optimal upper rainfall limit for the RC system is below 440 mm in the experiment. For corn, the adoption of the RC practice in the 230–440 mm rainfall area will make the system more effective during the whole growth period and offer a sound opportunity for sustainable farming in semiarid areas. 相似文献
20.
通过对现代农业概念和特征的阐述,分析了中国现阶段必须发展现代农业的3个主要原因,即只有发展现代农业才能保障中国的粮食安全、只有发展现代农业才能提高中国农业的国际竞争力、只有发展现代农业才能不断地增加农民收入。结论为中国发展现代农业需要处理好的四大关系、发展现代农业需要有现代农业制度的支撑、发展现代农业需要相关产业和科技的支撑、中国发展现代农业需走内涵式规模经营道路。 相似文献