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long-term effects of fertilization on soil organic carbon changes in continuous corn of northeast china: rothc model simulations.soil organic c (soc) content can increase by managing land use practices in which the rates of organic c input exceed those of organic c mineralization. understanding the changes in soc content of black soils (mainly typic halpudoll) in northeast china is necessary for sustainable using of soil resources there. we used the rothc model to estimate soc levels of black soils under monoculture cropping corn in a long-term fertilization trial at gongzhuling, jilin province, china. the model outputs f ...200314986895
dissipation and residue of s-metolachlor in maize and soil.the purpose of this article was to establish a simple residue analysis method for s-metolachlor in maize and to study its dissipation and residue in maize field eco-system. the results showed that s-metolachlor declined rapidly in maize seedling and soil after application. the half-lives of s-metolachlor in maize seedlings in beijing and changchun were 6.68 and 4.85 days, respectively, and in soil were 12.81 and 14.81 days, respectively. the terminal residues of s-metolachlor in soil samples wer ...200818473109
[dynamic characteristics of leaf area index and allocation characters of ecological resources for different yielding spring maize populations].by using 3-year field experimental results and related meteorological observation data, the dynamic characteristics of leaf area index (lai) and the allocation characters of ecological resources for different yielding spring maize (zea mays l.) population in huadian of jilin province were studied. the results showed that the dynamic characteristics of relative lai, with the relative growth days of test population, relative effective accumulated temperature, relative sunshine hours and relative r ...200919449577
dissipation and residues of nicosulfuron in corn and soil under field conditions.a simple, sensitive method for the analysis of nicosulfuron in corn and soil was developed. samples were extracted with acetonitrile: water (2:3, v/v) mixture and partitioned with dichloromethane. after concentration, the soil sample extracts were detected using high performance liquid chromatography-ultraviolet detector (hplc-uvd), and the corn sample extracts were detected using high performance liquid chromatography-mass spectrometry detector (hplc-msd). the fortified recoveries at 0.05-1.0 m ...201020512311
[distribution characteristics of soil phosphorus in maize belt farmlands of northeast china].the study on the vertical distribution and latitudinal differentiation of soil total and organic phosphorus (p) down to 100 cm depth in maize belt farmlands of northeast china showed that in hailun and harbin of heilongjiang province, gongzhuling of jilin province, and dashiqiao of liaoning province, soil total p decreased with soil depth, being significant higher in 0-40 cm than in 40-100 cm (p < 0.01). in dehui of jilin province and in changtu and shenyang of liaoning province, soil total p wa ...200819102305
[analysis of trace elements in corncob by microwave digestion-icp-aes].the contents of trace elements of zn, mg, mn, sr, fe, pb, cu and se in the corncob collected from beijing, shan-dong, jilin, yunnan, xinjiang, gansu, shanxi, shaanxi, jiangsu, neimeng in china were determined by icp-aes using microwave digestion. the optimum condition of digesting the corncob was: put 1.5 ml of 68% nitric acid and 0.5 ml of hydrofluoric acid in the pot, then digested the sample with 3 steps under the 400 w power in the microwave oven. this digesting procedure could completely an ...200717944429
[response of maize emergence rate and yield to soil water stress in period of seeding emergence and its meteorological assessment in central area of jilin province].in spring of 2010-2011, an experiment with treatments on soil water stress and sowing by stages of spring maize (zea mays) was conducted in the central jilin province. the responses of maize emergence rate and yield to soil water stress were analyzed, and the assessment models of the emergence rate and reduction of yield caused by drought were established based on meteorological conditions. the results showed that during the study period, the relationship between maize emergence rate or per unit ...201424830245
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