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21.
《The Journal of Applied Poultry Research》2006,15(2):287-291
Campylobacter numbers on broiler carcasses can increase dramatically during defeathering because of leakage of contaminated gut contents in the feather-picking machine. Food-grade organic acids have been shown to be effective in killing bacteria. Placement of organic acids into the cloaca prior to defeathering was tested to determine if such a treatment could lower the number of Campylobacter that escape and contaminate broiler breast skin during automated feather removal. Campylobacter numbers on the breast skin of treated carcasses increased during defeathering but resulted in numbers that were only about 2% of those observed on control carcasses. Placement of food-grade organic acids in the cloaca of broiler carcasses may be useful as a means to lessen the impact of automated defeathering on the microbiological quality of carcasses during processing. 相似文献
22.
试验采用单因素随机区组设计,叶面喷施肥料的施肥方法,应用方差分析和多重比较分析试验数据,从而筛选出小菊最佳的营养元素配方。试验从不同叶面肥料在小菊上的筛选与应用研究的试验结果得到:小菊对肥料具有较强的选择性:三高灵的施用能够增加小菊的开花数量和鲜叶片叶绿素的含量;宝力丰的施用能提高小菊单株的干物重;OPAL的施用能延长小菊开花的花期。 相似文献
23.
Abstract. The Pan‐European Soil Erosion Risk Assessment (pesera ) model was evaluated using existing soil erosion data collected under various types of climate, vegetation, landscape and soil conditions. The data used represent a variety of typical Mediterranean land uses such as winter wheat, vines, olives and bare, stony land prevailing in hilly areas. Using this data, the model was calibrated for sediment transport by overland flow and results compared to measured soil erosion values from runoff plots and a watershed on a monthly basis. The performance of the model was assessed statistically, showing that it can be satisfactorily used for predicting soil erosion rates under the conditions included in the study. The overall model estimate including all the available experimental data was 0.69 t ha?1 yr?1 with a maximum error of 1.49 t ha?1 yr?1. After validation, the model was applied to a small watershed (60 ha) of great ecological importance for the sea turtle Caretta caretta. For this purpose, soil and vegetation maps were compiled from all the necessary data for applying the model. The model was run for three years using daily data from an existing nearby meteorological station. The predicted and measured soil erosion rates for a 7‐month period were 0.31 t and 0.18 t, respectively. Application of the model to each mapping unit showed the over‐riding importance of land use for sediment generation under the given climatic conditions. Bare land, occupying 5.5% of the watershed area, generated up to 69% of the total sediments estimated for the watershed. It is concluded that the pesera model can be used as a regional diagnostic tool under a range of soil, topographic and climatic conditions for identifying the best land use type and vegetation cover to protect hilly areas from soil erosion. The calculated overall root mean square error for the model is 0.06 t ha?1 yr?1, compared to a soil erosion rate of 0.04 t ha?1 yr?1, which can be tolerated for protecting the area for the sea turtle. 相似文献
24.
25.
施肥对红三叶群落营养元素含量和积累量的影响 总被引:1,自引:0,他引:1
本文研究了施肥对红三叶群落地上部和地下部 1 0种营养元素的影响 ,结果如下 :( 1 )从含量看 ,施氮肥后 ,地上部B明显降低 ,地下部B明显升高 ;施磷肥后 ,地上部N、B显著下降 ,地下部K、P、N上升幅度较大。 ( 2 )就积累量而言 ,施氮肥后 ,地上部大多数元素增高 ,地下部多数元素降低或无变化 ;施磷肥后 ,无论地上部还是地下部 ,大多数元素均有所增高 相似文献
26.
对永城县1982年至1987年土壤养分变化动态进行了定点分析研究.共分析了三十个乡的257个土样。土壤有机质和氮素含量1987年比1982年相应提高25%和41.4%;而速效磷和钾则相应降低36.1%和89.9%;微量元素有效锌、硼、钼含量均属中低级水平。据此提出了相应的培肥措施. 相似文献
27.
28.
Jørgen Lauritzen Jensen 《Journal of Wood Science》2005,51(6):577-582
A quasi-non-linear fracture mechanics model based on beam on elastic foundation theory is applied for analysis of the splitting
failure of dowel joints loaded perpendicular to grain. Simply supported beams symmetrically loaded by two dowels are considered,
and the effects of edge distance, dowel spacing, and distance between dowels and supports are accounted for. The foundation
modulus used in the beam on elastic foundation model is chosen so that the perpendicular-to-grain tensile strength and fracture
energy properties of the wood are correctly represented. This ensures that a conventional stress analysis and failure criterion
lead to the same solution as the compliance method of fracture mechanics. A semiempirical efficiency factor is proposed to
account for the influence of the total beam depth, which does not enter the beam on elastic foundation model, but the effect
of which is evident from tests. It is shown that the so-called Van der Put/Leijten model, which recently has been adopted
in Eurocode 5, appears as a special case of the model presented. Tests on simply supported beams with a single dowel joint
at midspan are compared with the theoretical predictions. Various edge distances, beam depths, and spans were tested. 相似文献
29.
通过新型的小麦深施肥播种机的应用,实现了小麦深施肥播种,使种、肥分箱不同床,解决了过去化肥对种芽、幼苗的危害问题。达到了节本增效、增产增收的目的。 相似文献
30.