calcium compounds; crops; geophysical techniques; nitrogen compounds; regression analysis; soil; spectrophotometry; coefficient determination; corrected absorbance; correction factor method; crop growth; dual wavelength K ratio spectrophotometry; fitting correlation coefficient; method feasibility; method validity; nitrate nitrogen concentration; nitrate nitrogen quantitative model; nitrite interference elimination; nitrite interference removal; reference wavelength; regression analysis; repeatability precision; saturated calcium sulfate solution; short-term supply; soil extraction; soil nitrate nitrogen content; soil nitrate nitrogen detection; soil nitrate nitrogen determination; soil sample experiment; spectrum scanning; standard curve linear regression equation; ultraviolet spectrophotometry; Absorption; Nitrogen; Pollution measurement; Soil; Soil measurements; Standards; Wavelength measurement; Dual-wavelength; K ratio spectrophotometry; Nitrate nitrogen; Quantitative analysis;
机译:基于土壤氮肥的肥力管理氮肥施用量,目的是降低苏丹草(Sorghum sudanense(Piper)Stapf)中的硝酸盐氮浓度
机译:天然水中的氮循环,采用原位无试剂紫外分光光度法同时测定硝酸盐和亚硝酸盐
机译:土壤中氮的测定。第五部分。总氮的估计包括硝酸盐
机译:基于K比分光光度法的土壤中硝酸盐氮的测定
机译:猪粪肥施用量,施用时间和施用方法的变化对底土水中硝态氮,作物产量,氮素吸收和恢复以及土壤残留硝态氮的影响:一项为期三年的研究。
机译:灌溉和氮素处理通过调节小麦根系生长促进土壤深层土壤水和硝态氮的利用
机译:易分解植物材料,土壤和含硝酸盐和/或亚硝酸盐氮的泥水中总氮的测定