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- Abstract：Identification of the tolerance to low-phosphorus of japonica rice resources is significant to rice breeding and genetic research on tolerance to low-phosphorus.Using the ratio of plant yield cultivated under low-phosphorus condition to that under normal condition,the japonica rice core collection compring 356 varieties were identified and screened under the low and normal phosphorus cultivated field conditions.The japonica rice core collection was sampled from North-east China rice district,Huabei rice district,North-west China rice district,Huazhong rice district and South-west China rice district.The result indicated that the North-east China rice district has the highest mean relative plant yield of 0.81.Huabei rice district has the lowest mean relative plant yield.According to relative plant yield,76 varieties with tolerance to low-phosphorus,44 varieties with sensitive to low-phosphorus and 236 medium type varieties were identified.Considering the percentage of materials with tolerance to low-phosphorus,North-east China rice district has the highest percentage and North-west China rice district has the lowest percentage.13|1|0<HTML><DownloadPDF> <Meta-XML>Updated：2023-12-22
- Abstract：In the semi-arid areas of the ecotone between the agriculture and animal husbandry areas in north China,soil water is crucial to agricultural production.In order to evaluate the effect on soil moisture of different methods of restoring farmland to forest and grassland,this paper analyzed the temporal and spatial variations of soil moisture under forestland,shrub land,and grassland.The soil moisture within 0-100 cm was measured during the growing period in 2005.The results indicated:1)Water consumption of different types of vegetation during the growing season was mainly dependent on the rainfall.In general,the changes of soil moisture content corresponded to the amount of precipitation during the growing season.2)There was little difference in the soil water content in the 0-30 cm range among the various types of vegetation.In the 30-100 cm soil layer,the soil water content in forestland was higher than that in shrub land and grassland,and the soil water content in shrub land was higher than that in grassland during the growing season in 2005.In the 0-100 cm soil layer,the maintenance of soil water content in the forested area was better than that of the shrub land and grassland.3)The water consumption of the three different types of vegetation during the growing season was higher than the amount of precipitation received in 2005.0|1|0<HTML><DownloadPDF> <Meta-XML>Updated：2023-12-22
- Abstract：Progresses of perennial rhizomatous energy plants screening in the European Union and the United States of America are overviewed and the plant resource in North China is evaluated in this article.It has been recognized that rhizomatous energy plants are the most promising biomass crops in marginal lands of the world,because of the high biomass yield,high water and nutrient use efficiencies,friendly ecological effects and low cultivation cost.According to numerous screening studies,miscanthus(Miscanthus spp.),switchgrass(Panicum virgatum),reed cannarygrass(Phalaris arundinacea),giant reed(Arundo donax) have been found to be the most potential species for biomass energy production in occident countries.Due to serious limitation of arable land resource in China,it is expected that rhizomatous crops are suitable to be developed in North China,where there are plenty of marginal land resources with arid and semi-arid climates.In the North China,rhizomatous plant resources are rich.Lovely achnatherum(Achnatherum splendens),shortstipe roegneria(Roegneria brevipes),dahuria wildryegrass(Elymus dahuricus),Chinese leymus(Leymus chinensis),and common leymus(Leymus secalinus) are examples of these plants which are resistant to drought.We suggest that native species and introduced exotic species of rhizomatous plants should be screened as the suitable energy plant in the arid and semi-arid regions of North China.Then,researches on breeding,water and fertilizer utilization,management technologies,and ecological effects need to be conducted.1|1|0<HTML><DownloadPDF> <Meta-XML>Updated：2023-12-22
- Abstract：We cloned Cry 1A(B),BAR,CP4-EPSPS,PAT and RBCL genes from transgenic soybean,maize and rice into a PMD18-T vector,so that the rseulting novel plasmid,pMD18-T-PAT-CP4-EPSPS-Cry 1A(B)-BAR-RBCL with a full length of 4.7 kilobase,can be used as the standard reference molecule in the qualitative detection of exogenous genes.Identification by double restriction endonuclease digestion,sequencing and by PCR showed that the recombinant plasmid was in accordance with the expected length and sequence of target genes.Thus,the plasmid constructed in this study is reliable and may be used as a versatile standard reference molecule in the qualitative detection of Cry 1A(B),BAR,CP4-EPSPS and PAT genes in different transgenic food crops.5|1|0<HTML><DownloadPDF> <Meta-XML>Updated：2023-12-22
- Abstract：In this paper,Water Deficit Index(WDI) was introduced briefly and was estimated with NOAA-AVHRR 10-day composite dataset of NDVI,CH4 and CH5 light temperature.Based on the 10-day WDI images,the pixels that represent the drought-stricken farmland and the drought-damaged farmland were picked up for each year.Only when more than one decade WDI during crop development period from March to October was greater than 0.7,the pixel was thought as drought-stricken.And more than two continuous decades WDI were greater than 0.75,the pixel was treated as drought-damaged.With the criterion,the drought-stricken and drought-damaged farmland in China was estimated during 1982-2001 with the assistance of farmland distribution map.The comparison between remotely sensed and statistical drought-stricken and drought-damaged farmland areas showed that it is disagreement in the early 1980s,while remotely sensed drought-stricken farmland areas could be reference data and remotely sensed drought-damaged farmland areas were consistent with the statistical data.2|1|0<HTML><DownloadPDF> <Meta-XML>Updated：2023-12-22
- Abstract：Based on data from 20 meteorological stations in Beijing region between 1951 and 2006,risk distribution maps of hail disaster in Beijing region were made after probability density functions were determined.The results showed that hail disaster has marked characteristics of POSSION distribution.Risk of hail disaster reduced along with the increasing hail days in a year.The hail risk probabilities are 50 percent,18.8 percent,4.6 percent and 0.9 percent respectively while the hail days are no less than 1,2,3 and 4 in a year.Hail risk distribution presents marked spatial characteristics in Beijing.Spatially,the high-frequency hail disaster occurred mainly in mountainous areas rather than urban areas.The northeastern part is much more likely to have hail storms than the southern area.The hail risk probability of Fuyeding station in northwestern part is 98.1 percent in a year and over 60 percent in June.it is the main disaster district in Beijing.1|1|0<HTML><DownloadPDF> <Meta-XML>Updated：2023-12-22
- Abstract：The experiment was conducted to study the effects of supplementing whole milk with flour,on slaughter performance and meat quality of Holstein bull calves.Twenty calves with similar birth weights were fed with whole milk for 35 days,then randomly divided into a control group fed continuously with whole milk and three treatment groups fed milk supplemented with 2%,4% and 6%(mass fraction) flour.Three calves randomly selected from each group were slaughtered at the age of 90-days.The results showed that adding flour in milk increased(P<0.05) the live weight,carcass weight,net meat weight,meat percentage of carcass,loin-eye area,muscle tenderness and fat content.The improvement in slaughter performance and meat quality increased as the supplementation rate of flour increased.In conclusion,adding less than 6% flour to milk could improve the slaughter performance and meat quality of veal calves.1|1|0<HTML><DownloadPDF> <Meta-XML>Updated：2023-12-22
- Abstract：This study was conducted to determine the effect of dietary Saccharomyces cerevisiae mannan oligosaccharides(SC-MOS) supplementation on intestinal microflora,short-chain fatty acids and immunity function.Three hundred one-day-old Arbor Acre male broiler chicks were randomly allocated into five groups with four replicates each.The chicks were fed with a basal diet containing 0,0.05%,0.10%,0.15% and a basal diet with 0.10% Konjac MOS.The result showed that groups supplemented with SC-MOS(P<0.01) had lower counts of E.coil and Salmonella in cecum.Groups supplemented with 0.05 and 0.1% SC-MOS had increased concentration of cecal bifidobacterium(P<0.01).SC-MOS groups can increase the antibody titers of New castle disease virus(NDV) 14 d after the first and second inoculations(P<0.05).The 0.1% SC-MOS supplementation improved the ConA lymphoblast transformation rate(P<0.05) while the 0.05%(P<0.01) and 0.1% SC-MOS(P<0.05) significantly improved the phagocytosis of peripheral blood monocytes.The total effects of SC-MOS can match or surpass those of Konjac MOS.The SC-MOS extracted in the laboratory may be widely used as a new green feed additive.5|1|0<HTML><DownloadPDF> <Meta-XML>Updated：2023-12-22
- Abstract：Aiming at the quality control of fresh self compacting concrete(SCC),fuzzy evaluation method(FEM) for evaluating workability of SCC was put forward and an evaluation was done according to experimental results to verify the new method.It indicated that FEM can give a quantitative evaluation of workability of SCC and it is convenient to establish an expert system for monitoring the quality of fresh SCC.1|1|0<HTML><DownloadPDF> <Meta-XML>Updated：2023-12-22
- Abstract：In this paper,rice consumption of China and its impacts on the domestic and the other countries in Asia were analyzed by means of the Asian International Input-output Table.The results show that the characteristics of the rice consumption in China appear varieties of regionality and diversity and there comes a decreasing trend in rice consumption.Input-output analyses indicate that the change of rice consumption in China has more impact on the added value of China agriculture and China non-agriculture industry,less impact on those of Asia rice production,Asia agriculture and Asia non-agriculture industry.Considering impact of the added value,Asia non-agriculture industry was greatly affected.In addition,in the added value of the China rice industry,China agriculture contributed more shares for it,and less effect was evaluated from Asia rice industry.1|1|0<HTML><DownloadPDF> <Meta-XML>Updated：2023-12-22
- Abstract：In order to solve the loss and distortion within the limit of the planar linguistic evaluation information in the application of Good Agriculture Practice(GAP) on vegetable sites,this study is illustrated by an example relevant to the agricultural produce safety evaluation from 2001 to 2006 on six registered export spinach sites in Shandong Province.A multi-attribute approach based on panel data and linguistic information is proposed,an agricultural produce safety evaluation index system is put forward according to GAP standard,statistical evaluation data is gathered form GAP auditors,and various period evaluation results are aggregated by multi-criteria and time weights to obtain the final evaluation values.Further,improvement of the application of GAP on vegetable sites can be achieved on the basis of sufficient analysis.The above study indicates that the linguistic information can be effectively aggregated with less lost by this method,and this approach embodies the recognition degree to the present data from decision-makers,which will promote the extension and application of GAP,and realize the target of agricultural product safety.2|1|0<HTML><DownloadPDF> <Meta-XML>Updated：2023-12-22
