Farmers' Attitudes to the Benefits and Barriers of Adopting Automation for Surface Irrigation on Dairy Farms in Australia

The study reports farmers' attitudes andperceptions towards the ``barriers' and ``benefits' of automaticirrigation systems. Factor analysis was used to identify perceived ``barriers' and ``benefits' andthe impact of these on farmers' priority to adopt automation wasexamined. Results suggest that farmers'attitudes, particularly with respect to ``cost' and``lifestyle' influenced the priority given to adopting automaticirrigation systems. The area under pasturecultivation was also an importantdeterminant in the farmers' priority foradopting automatic irrigation systems.     

基于近红外光谱定量分析技术对大米年际的研究

大米是我国居民膳食的重要来源,其新陈度直接影响到大米的营养成分。为了探索大米新陈度的高效、安全、快速检测方法,利用近红外光谱技术对150份大米进行检测研究。结果表明,采用偏最小二乘法建立的定量分析模型对不同年际大米的正确鉴别率高达94.1%。因此,使用近红外光谱对大米进行快速新陈度鉴别可取得较高精确和稳定的检测结果。     

野桑蚕CYP305B1V1基因的克隆与序列分析

对野桑蚕CYP305B1V1基因进行克隆和序列分析的结果显示,野桑蚕CYP305B1V1基因的ORF为1 464nt,编码487 aa;同源性分析表明,在DNA水平上野桑蚕CYP305B1V1基因与家蚕CYP305B1基因的同源性达99%,与推导的氨基酸序列完全一致。通过和NCB I中家蚕基因组数据比对和拼接,预测野桑蚕CYP305B1V1基因结构中至少含有6个内含子,且内含子与外显子之间的连接符合GT-AT法则。     

Spatial and temporal analysis of coffee wilt disease caused by Fusarium xylarioides in Coffea canephora

Coffee wilt disease (CWD) caused by Fusarium xylarioides, considered to be a soil-inhabiting fungus, is endemic in several African countries, affecting commercially important coffee species and causing serious economic losses. Coffee wilt disease development in naturally infected Coffea canephora fields at the Coffee Research Institute in Uganda was assessed from April 2001 to March 2006 to generate information about temporal and spatial spread of the disease. Maps of diseased trees were also generated from the data. Semi-variance analysis was performed on the data to show the spatio-temporal structure of disease. Host influence on the spatio-temporal structure was deduced from the distribution pattern of diseased and healthy trees and analysis of variance. Results show that the temporal disease epidemic progress was slow. The disease was found to spread from initial infections to healthy neighbouring trees, resulting in an aggregated pattern. An infected tree could infect up to three healthy trees away, in any direction. Disease foci formed and expanded with time, coalescing but punctuated in spots planted with resistant hosts. There were varying levels of susceptibility among host genotypes, affecting the rates and levels of epidemic development. The implications of the findings to the control of CWD are discussed.     

集对分析法在区域雨水资源开发利用潜力综合评价中的应用

探讨了区域雨水资源开发利用潜力的综合评价方法,并将集对分析理论应用于该研究,建立了区域雨水资源开发利用潜力综合评价模型。实例分析表明,该方法用于评价区域雨水资源开发利用潜力,方法简单,评价结果符合实际情况。     

Waxy durum acts as a unique form of crumb softener in bread

Flour milled from waxy durum grain was incorporated into bread formulations and its effects on crumb softness and loaf volume compared to those of added fats and emulsifiers. Waxy durum had a small effect on increasing loaf volume, and little of this effect could be explained by dough height or oven spring; effects of most other additives were closely related to dough height or oven spring. For all additives, the relationship between crumb softness and loaf volume fitted a power law relationship. Waxy durum and some of the additives had a greater softening effect than predicted from their effect on volume while others produced a much firmer crumb. With only one exception, when combined with other additives waxy durum reduced compression of the crumb more than predicted on the basis of the effects on loaf volume of the additives alone. In common with some of the added lipids, during compression analysis, crumb prepared with waxy durum flour had similar levels of structural damage as crumb baked from the standard formulation; other lipids and emulsifiers produced more fragile crumb. Waxy durum flour appears to have unique effects on crumb softness.     

基于SRAP分子标记的11份柑橘种质材料遗传多样性分析

为分析11份柑橘种质材料的遗传多样性,本研究以7份沙糖橘种质以及4份其他柑橘种质为试验材料,利用SRAP分子标记进行分析,并用UPGMA法进行聚类.结果表明:160对引物组合筛选出20对引物组合扩增条带清晰,11份种质材料两两之间遗传相似系数在0.322 1～0.931 6之间.沙糖橘和金葵蜜橘间的遗传相似系数最大,为...     

近43年黄河上游来水来沙变化特点

选取黄河头道拐站实测水沙序列(1960-2002年)资料,对水沙序列进行了多时间尺度和趋势识别的小波分析。结果表明:①黄河上游来水来沙量汛期所占比例减少,而非汛期所占比例增加;在年际变化上,水沙量逐年减少;同时,水沙相关关系具有一定的变化;②黄河上游水沙序列具有相同的多时间尺度(准周期)变化,但同一尺度下,水沙所处的丰枯变化并不一致;③年水沙序列趋势变化基本一致,20世纪80年代以来,两者存在明显减少趋势;但在非汛期,两者的趋势变化有较大区别。     

基于SWOT分析的山东省农业旅游研究

采用SWOT分析法分析山东省农业旅游发展中的优势、劣势、机会和威胁,并提出了山东省发展农业旅游的对策和措施。