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- Abstract：This paper is concerned on the problems of flood disaster in agriculture and the measures for reducing losses along Huaihe River.Focusing on the characteristics and reasons of the disaster,the seasonal and spatial distribution of the disaster at the average and the longest plum flood season and the agricultural flooding period are analyzed.The reasons inducing agricultural disaster during summer include heavy showers at the plum flood season,the low topography key period of crop growth and water competition bewteen man and crop.Based upon these analysises,we put forward new cropping patterns in order to avoid the flood.The new patterns include buckwheat and barley,silage corn and barley,Chinese cabbage and barley,garlic sprout and buckwheat,radish and onion,autumn tomato and spring tomato in green house,green house celery and film-covered potato etc.These findings may widen agricultural income in the flood-sensitive region and can be used as the technical pattern for avoiding flooding disaster in the region.Keywords：along Huaihe River,agricultural flooding disater,flooding disaster season analysis,flood-avoiding cropping,pattern research,the shed vegetable,vegetable and grain crop rotate4|6|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：In order to guide water-saving irrigation,evapotranspiration(ET_c) of four perennial flowers,Dianthus chinensis L.,Hemerocallis fulva L.,Iris tectorum Maxim.,and Sedum spectabile Boreau,was studied by mini-lysimeter under controlled condition in 2006 at National Precision Agriculture Research Station,Xiaotangshan,Beijing.Four irrigation levels were employed according to ET_c feedback irrigation principle as follows,100% ET_c,75% ET_c,50% ET_c,and 25% ET_c(ET_c here means the evapotranspiration of plant at ample irrigation).At 100% ET_c irrigation level,D.chinensis and H.fulva had two ET_c peaks in July and September,respectively,while I.fulva and S.spectabile had a gentle ET_c curve.The total ET_c was(432.61?mm) for D.chinensis,(332.40?mm) for H.fulva,(186.93?mm) for I.tectorum,and(161.37?mm) for S.spectabile from June to October.According to the rainfall amount at the experiment site in 2006,additional irrigation was unnecessary for the four plants from June to August,but it was needed in September and October;the irrigation amount was(185.38?mm) for D.chinensis,(154.32?mm) for H.fulva,(48.52?mm) for I.tectorum,and(42.15?mm) for S.spectabile.Growth and ornamental indexes of four species under four irrigation levels were measured and analyzed and results show that the growth of D.chinensis,H.fulva,and I.tectorum was not significantly influenced by the slight drought treatment at 75% ET_c in comparison to that of the ample irrigation level at 100% ET_c.Remarkably,S.spectabile showed strongest drought-resistance and its growth varied insignificantly even at the irrigation level of 50% ET_c vs.100% ET_c.In summary,D.chinensis,H.fulva,and Iris tectorum would save 46.34,38.58 and(12.13?mm) of irrigative water,respectively,by adoption of 75% ET_c irrigation,and S.spectabile would save(21.08?mm) if irrigated at 50% ET_c level.34|7|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：This article examines the dynamic relationship between China's soybean oil spot and futures price by using VAR model,cointegration test,error correction model,impulse responses analysis and variance decomposition methods,etc.The results from this research suggest that the futures and spot prices exist long-run equilibrium relationship,and that futures market plays more important role in the function of price discovery.In the impulse responses function,futures price's innovation have more influence on spot price,except futures and spot price have immediate strong feedback on one self's a standard difference innovation.7|6|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：Based on some research paper and achievement databases,this paper makes statistical analysis on selected topic distribution,chronological distribution and periodical distribution.It is found that evaluation of land resources,land use and land cover change have been becoming the focus of those project supported by National Natural Science Foundation of China,Chinese degree papers and periodical papers.With much regard to land issues,the number of periodical papers and research achievements concentrated on land resource research increased gradually,it showed that land is becoming the focus of social attention.In view of periodical distribution,the proportion of periodical papers which belong to transaction level is very low,so land resource research should be improved.Furthermore,scientific research achievements pay more attention to practicability and application.As a result,the research emphases and directions of different topics in the future were put forward in this paper.1|5|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：Five strains out of 568 Bacillus isolates proved to have an antagonistic action toward methicillin resistant Staphylococcus aureus(MRSA).Among the 5 strains,Bacillus strain 64-3 showed the best inhibitory effect against MRSA.Strain 64-3 was identified as Bacillus subtillus based on its morphological and physiological-biochemical properties in combination with 16s rDNA sequence analysis.Moreover,the cell-free extract,bacterial suspension and supernatant from strain 64-3 were used individually to examine their activity against MRSA.It was seen that the culture supernatant had the strongest action against MRSA compared with the other treatments.This implied that the metabolites produced by B.subtillus 64-3 had notable inhibition effect toward MRSA.2|7|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：This paper is concerned on the problems of flood disaster in agriculture and the measures for reducing losses along Huaihe River. Focusing on the characteristics and reasons of the disaster, the seasonal and spatial distribution of the disaster at the average and the longest plum flood season and the agricultural flooding period are analyzed. The reasons inducing agricultural disaster during summer include heavy showers at the plum flood season, the low topography key period of crop growth and water competition bewteen man and crop. Based upon these analysises, we put forward new cropping patterns in order to avoid the flood. The new patterns include buckwheat and barley, silage corn and barley, Chinese cabbage and barley, garlic sprout and buckwheat, radish and onion, autumn tomato and spring tomato in green house, green house celery and film-covered potato etc. These findings may widen agricultural income in the flood-sensitive region and can be used as the technical pattern for avoiding flooding disaster in the region.1|7|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：The paper is about supply,uptakes and use efficiency of N,P and K in aerobic rice and wheat cropping system.The results indicated that wheat had higher requirement for the nutrients and was more sensitive to P and K than aerobic rice.On the average,the soil supplied about(12.5?g/m~2)(N),(3.3?g/m~2)(P) and(22.7?g/m~2)(K),more in the first season.The nutrient supplying capacity of the soil largely depended upon fertilization.The apparent use efficiencies of applied N,P and K were 33.4%,3% and-8.5% for the rice,and 69.3%,13.4%,36.9% for the wheat.Producing one ton of rice grain required for N 14.9 to(33.7?kg), P 2.9 to(5.9?kg) and K 17.9 to(38.1?kg) re-spectively,but 15.9 to(28.3?kg) N,3.1 to(4.2?kg) P and 15.9 to(21.6?kg) K for the wheat grain.NPK treatments resulted in 18.4% and 25.8% higher rice yield than PK treatment in the first and the second season respectively,but for the wheat,the yields were significantly improved 54.1% and 158.7% respectively.Obviously,N is the main factors confining the yield of aerobic rice and wheat in Huai-river plain.4|6|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：To study the yield of an aerobic rice variety,HanDao297(HD297),and determine a reasonable planting density,a field experiment was carried out in 2003 and 2004.The seeding rate was 120 kg/hm~2 in 2003 and three seeding rates60,90 and 120 kg/hm~2-were used in 2004.The grain yields(t/hm~2) at the three seeding rates were 3.8,3.5,and 3.4 respectively.The aboveground biomass at maturity varied from(1?005.0?g/m~2) to(1?283.4?g/m~2) and the differences among the three seeding rates were not significant.The harvest index(HI) was 0.36 for 60?kg/hm~2,0.34 for 90?kg/hm~2,and 0.26 for 120?kg/hm~2 and the HI at 120?kg/hm~2 was significantly lower than the other two rates.Generally,the small glume number led to the low yields of aerobic rice.Percentage of filled spikelets affected yields as did the variation in growth environment but grain weight had little effects on yields.For Han Dao 297,the best population density for maximum number of total and productive tillers,spikelet number per panicle,and percentage of filled spikelets was for 60?kg/hm~2.However,the number of glumes per unit area was highest at 90?kg/hm~2.Therefore,the seeding rate of 60-90?kg/hm~2 is recommended for high grain yield.0|6|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：In order to solve problems that were occurred for paddy fields with long-term no-tillage,which was not favorable for paddy rice growth,three treatments of no-tillage(NT),rotary tillage(RT),and conventional tillage(CT) were set up in the paddy field with 7 years no-tillage in double cropping rice region,Hunan province.Double rice cropping was practiced annually in this area.Total organic carbon(TOC),active carbon(AC) and carbon pool management index(CPMI) were measured.The results showed that Both TOC and AC in 0 to(20?cm) soil were in the order of RT>NT>CT.Compared with NT,RT enhanced AC.In contrary,CT reduced AC.The average CPMI of 0 to(20?cm) soil was also in the order of RT>NT>CT at the late rice harvest.The CPMI was significantly lower under CT compared to NT,but it was not significant for RT that for NT at the 5% level.In conclusion,compared with NT,CT reduced AC and CPMI.But RT had not significant effect on soil C pool.0|6|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：A new embedded sensor based on the principle of measuring forces with strain gauges and real-time system for measurement of soil compaction was developed.The soil compaction sensor was embedded in the front of the cone;the tip can directly transmit the pressure from the soil to the sensor,which simplifies the structure of measuring system and increases the systematic synthesized degree.The data acquisition system that uses MSP430 as its core collects signals and accomplishes A/D conversion.Two serial ports complete the communication with PDA and receive the GPS signals,in which PDA is used for processing and saving data.The experimental results showed that the embedded sensor for measuring soil compaction could effectively reflect the compaction variation in the field,the function of the real-time system performed well for long time operation and the agreement of the signals from the integrated sensor and GPS was good.0|6|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：It is an important technical measure to improve the welfare of housing pigs by increasing the environmental enrichment.To investigate the selection preference of finishing pigs for different environmental enrichment materials in a housing system,some environmental enrichment materials were tested in this study.The actions of 20 finishing pigs randomly selected were video-recorded and analyzed the contact frequency and time.The result showed that the contact frequency and times between the pigs and the gnawing materials decreased with the time of a material to be provided.The sequence of the contact frequency and time was: iron chain>nylon string>striped bicycle inner tube>plastic water pipe>thin iron stick.The average contact frequency of iron chain is significantly higher than that of others.The sequence of contact frequency and time between pigs and the rooting materials is: fresh clay>cobble>incubation earth for mushroom>straw>smashed sawdust>plastic ball.The favorite ranking material for pigs is wood shelf.0|6|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：In order to study the feasibility of analysis of chemical compositions of fresh silage using near-infrared reflectance spectroscopy(NIRS),which is different from the pretreatment of comminuting after drying process as conventional means, a representative population of 119 silage samples was grounded under the protection of liquid nitrogen.Using the traditional methods to analysis chemical composition of the silage samples and using the spectrometer to scan their spectrums at the same time.All the NIRS calibrations for the fresh silage were developed by means of Modified Partial Least-Squares(MPLS) regression.Results showed that the RPD(SD/SECV)values of Dry Matter(DM),Neutral Detergent Fiber(NDF), Acid Detergent Fiber(ADF) and Crude Ash(CA) were all greater than 3.And the correlation coefficient of validation(R~2_v) of the parameters were all greater than 0.85.The RPD of the parameters for Crude Protein(CP),Acid Detergent Lignin(ADL) and Water Soluble Carbohydrate(WSC) were all greater than 2 and the R~2_v of them were 0.82,0.65 and 0.71 respectively.We concluded that NIRS could provide accurate prediction of a wide range of chemical compositions,including the contents of DM,NDF,ADF and CA;and NIRS could provide relatively accurate prediction of CP but extra samples should be collected to enlarge the variation range of CP for further validation.ADL and WSC content in fresh silage can roughly be estimated by NIRS,however,the precisions for them should be improved in future.1|6|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：This paper presents a novel algorithm to analyze transient harmonics.The algorithm combines the merits of wavelet transform and FFT transform.The frequency character of the sampled signal was obtained using FFT transform and the time domain character of the sampled signal was obtained using Stationary Wavelet Transform.Then the time-frequency character of transient harmonics was obtained using continuous wavelet transform.Theoretical analysis and simulation results validated that the algorithm presented in the paper could be used for precise transient harmonic analysis in power system.0|7|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：Aiming at some problems of lacking simple maneuverable and all-around decision-making warranty in some small towns in China.To avoid from replacing rural residence blindly,small towns at rural area of big cities were taken as research objects and we chose eighteen targets from seven facets and built up an evaluation system on feasibility of replacement of rural residences by using AHP, Delphi and fuzzy comprehensive evaluation method.A small town at Tianjin city, Huaming,was analyzed as an example.The result shows that Huaming town is a condign one for replacing rural residences,which coincides with the practice in the town.The result also proved the availability and efficiency in evaluation system of replacement of rural residences of small towns.0|6|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
