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Effect of Potash Application Patterns on Crop Yields Under Different Cultivation Systems

Pedosphere 1999年第3期9卷 219-226页

作者： CHENXIAOQIN zhoujianmin InstituteofSoilScience theChineseAcademyofSicencesNanjing210008China InstituteofSoilScience theChina

Three patterns of potash application were used in the corn-wheat and rice-wheat rotation experiments,which were conducted in the upland and wetland of Siyang County, northern Jiangsu Province, and the wetland of Liyang City, southern Jiangsu Province. The results of 5 cropping seasons (2 seasons/year)showed that the direct response of corn to K was larger than that of wheat, but no difference was found between rice and wheat in Siyang when the total annual amount of K was applied only in one cropping season. However, the response of wheat was much greater than that of rice in Liyang. If potash was applied in the preceding season, the residual effect of K on wheat was larger than that on rice both in Siyang and Liyang, but less than that on corn. The total effect (direct and residual effects) of K applied to corn or rice was greater than that to wheat in Siyang, but that to wheat was greater in Liyang. The direct and total effects of K application in the upland were larger than those in the wetland of Siyang; but for the wetland,the effects were larger in Liyang than in Siyang, especially in the wheat season. The results demonstrated that the most profitable practice to be recommended to the local farmers was to apply a limited amount of potash to only rice or corn but not to wheat. Equally applying half of the total annual amount of K to each of the crops may be advisable in order to lessen possible fertilization risks.

关键词： corn crop rotation potash application pattern rice wheat

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Influence of pH on Formation of Taranakites

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Pedosphere 1999年第1期9卷 35-44页

作者： zhoujianmin P.M.HUANG InstituteofSoilScience theChineseAcademyofSciencesP.O.BOx821Nanjing210008China DepartmentofSoilSci

Monoammonium phosphate (1 mol L-1), monopotassium phosphate (1 mol L-1) and aluminum ohloride (5×10-3 mol L-1) were used to investigate the influence of pH on the formation of NH4-taranakite and K-taranakite in systems with a high NH4H2PO4 or KH2PO4 concentration. The experimental data indicated that the reaction products of aluminum with NH4H2PO4 or KH2PO4 changed with the pH in the systems. In a pH range of 2.5 to 10.0, as the pH increased, the products in either ammonium or potassium system followed the sequence: taranakite, amorphous (NH4, K)2AlH(PO4)2 .4H2O, and then crystalline (NH4, K)AlPO4OH.2H2O. However, the pH ranges of the formation of these products in ammonium system were different from potassium system. NH4-taranakite formed from pH 2.75 to PH 5.75, whereas K-taranakite formed in the pH range of 3.00 to 5.00. From the theoretical calculation by a computer program (GEOCHEM version 2.0), NH4-taranakite and K-taranakite could form at the pH from 1.50 to 8.30 and from 1.25 to 8.45,respectively. These pH ranges were much wider than the experimental results. The difference between the experimental data and theoretical data was attributed to the lack of kinetic data and/or the incompleteness and inaccuracy of the thermodynamic data in the data base of the program. The PH ranges of the formation of the taranakites indicated that the taranakites could exist in the immediate vicinity of phosphate fertilizer zone as reaction products of phosphate fertilizers with soils, especially acidic soils, resulting in the fixation of not only phosphate but also nitrogen and/or potassium in soils.

关键词： ammonium pH phosphate fertilizer potassium taranakite

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焦化废水处理工程实例

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水处理技术 2010年第3期36卷 128-132页

作者：康晓静周建民端木合顺西安科技大学地质与环境学院陕西西安710054 西安飞科环保工程有限责任公司陕西西安710065

介绍了青海省某焦化厂生产生活废水处理工程的工艺参数、调试过程和运行效果。该工程设计处理能力为960m.3d-1。采用A2/O2、混凝沉淀、过滤、氨吸附工艺处理。出水水质指标达到并高于污水综合排放标准(GB8978-1996),其中部分出水回用于... 详细信息

介绍了青海省某焦化厂生产生活废水处理工程的工艺参数、调试过程和运行效果。该工程设计处理能力为960m.3d-1。采用A2/O2、混凝沉淀、过滤、氨吸附工艺处理。出水水质指标达到并高于污水综合排放标准(GB8978-1996),其中部分出水回用于生产和喷洒路面和草坪。

关键词：焦化废水生化法 A^2/O^2 混凝沉淀

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