To explore the effects of the two chelating agents on the availability of calcium and phosphorus in black soil of vegetable fields and the growth of cabbage(Brassica pekinensis Rupr.)seedlings,humic acid(F)and ethylen...To explore the effects of the two chelating agents on the availability of calcium and phosphorus in black soil of vegetable fields and the growth of cabbage(Brassica pekinensis Rupr.)seedlings,humic acid(F)and ethylene diamine tetraacetic acid disodium salt(EDTA)were used as experiment materials,and two factors and three levels completely randomized experiment of the nine treatments was set.The experiments were carried out by soil incubation experiment and pot experiment to investigate the effects of the two chelating agents with different ratios and their interaction on soil and cabbage.The results showed that there were very significant differences among soil pH,soil available phosphorus content,cabbage biomass,calcium and phosphorus accumulation of cabbage under the interaction of the two chelating agents.It could improve pH of the soil and reduce the electric conductivity(EC)value of soil,when applied chelating agents of different proportions.The EC value of soil fluctuated during the incubation period.There were significant differences between pH and EC in the early incubation period,but there was no significant difference in the later stage.And there were significant differences between soil available calcium and available phosphorus content;there were significant differences between cabbage biomass and the accumulation of calcium and phosphorus in cabbage,and the data of F2E2 treatment were significantly higher than those of other treatments.In summary,under the conditions of the experiment,the available phosphorus content of black soil in vegetable fields,the biomass and accumulation of calcium and phosphorus in cabbage increased significantly in F2E2 treatment(appied 675 kg•hm-2 of lime,300 kg•hm-2 of humic acid and 150 kg•hm-2 of EDTA).展开更多
Previous studies have shown that porous hydrated calcium silicate （PS） is very effective in decreasing cadmium （Cd） content in brown rice. However, it is unclear whether the PS influences cadmium transformation in...Previous studies have shown that porous hydrated calcium silicate （PS） is very effective in decreasing cadmium （Cd） content in brown rice. However, it is unclear whether the PS influences cadmium transformation in soil. The present study examined the effect of PS on pH, cadmium transformation and cadmium solubility in Andosol and Alluvial soil, and also compared its effects with CaCO3, acidic porous hydrated calcium silicate （APS） and silica gel. Soil cadmium was operationally fractionationed into exchangeable （Exch）, bound to carbonates （Carb）, bound to iron and manganese oxides （FeMnOx）, bound to organic matters （OM） and residual （Res） fraction. Application of PS and CaCO3 at hig rates enhanced soil pH, while APS and silica gel did not obviously change soil pH. PS and CaCO3 also increased the FeMnOx-Cd in Andosol and Carb-Cd in Alluvial soil, thus reducing the Exch-Cd in the tested soils. However, PS was less effective than CaCO3 at the same application rate. Cadmium fractions in the two soils were not changed by the treatments of APS and silica gel. There were no obvious differences in the solubility of cadmium in soils treated with PS, APS, silica gel and CaCO3 except Andosol treated 2.0% CaCO3 at the same pH of soil-CaC12 suspensions. These findings suggested that the decrease of cadmium availability in soil was mainly attributed to the increase of soil pH caused by PS.展开更多
In order to test whether the long-term application of calcium superphosphate leads to an increase of the soil rare earth element contents, superphosphate fertilized soils were sampled and compared with superphosphate-...In order to test whether the long-term application of calcium superphosphate leads to an increase of the soil rare earth element contents, superphosphate fertilized soils were sampled and compared with superphosphate-free soils. Spectrophlame inductively coupled argon plasma atomic emission spectrophotometer （ICP-AES） was applied to quantify the rare earth elements （REEs）. The total rare earth element contents in calcium superphosphate from Zhijin County, west part of Guizhou Province, China （produced by the sulphuric acid treatment of the apatites） are about 2.54 mg/g. Between 38 and 189 gREEs/hm^2 per year （available for plants, estimated by 2% citric acid） will be introduced into the soil solution when applying 320 kg superphosphate/hm^2 per year. The long-term application of the latter will increase the REE content by about 18% in the soil surface layer in these areas. A statistically significant increase of the content of the rare earths in some cultivated soils should not be neglected.展开更多
A pot experiment was conducted to investigate the effect of cow dung, rice husks, calcium chloride and gypsum on soil reclamation and compare the effect of organic and inorganic amendments on soil reclamation during t...A pot experiment was conducted to investigate the effect of cow dung, rice husks, calcium chloride and gypsum on soil reclamation and compare the effect of organic and inorganic amendments on soil reclamation during the period of 5th March to 20th April, 2017. The experiment was laid to fit a completely randomized design (CRD) with seven treatments [Reference soil (T0), Cow dung (T1), Rice husk (T2), Gypsum (T3), Calcium chloride (T4), Cow dung + Rice husk (T5) and Gypsum + Calcium chloride (T6)] each having three replications for this experiment. After incubation (45 days), the laboratory investigation was carried out in the Soil, Water and Environment Discipline, Khulna University, Khulna, Bangladesh. Results indicate that the individual or combined effect of gypsum (T3) was more effective in changing EC and SAR. Gypsum application in combination with calcium chloride (T6) improved the soil chemical properties by reducing the EC. Among the treatment, calcium chloride (T4) had a remarkable effect in reducing sodium adsorption ratio and gypsum had a remarkable effect in reducing pH. Cow dung (T1), rice husk (T2), combination of cow dung and rice husk (T5) were less effective to reduce EC, pH and SAR. It’s measured for soils of different soil amendments varied significantly展开更多
Little attention has been paid to the role of soil organic matter （OM） in the formation of pedogenic carbonate in desert soils. The relationships among soil OM, soil dehydrogenase activity （DHA）, and soil CaCO3 in...Little attention has been paid to the role of soil organic matter （OM） in the formation of pedogenic carbonate in desert soils. The relationships among soil OM, soil dehydrogenase activity （DHA）, and soil CaCO3 in a plant community dominated by Artemisia ordosica, located on the eastern boundary of Tcngger Desert in the Alxa League, Inner Mongolia, China, were studied to understand whether OM was directly involved in the formation of pedogenic carbonate. The results showed that DHA and CuCO3 positively correlated with OM content, and DHA, OM, and CaCO3 were correlated with each other in their spatial distribution, indicating that abundant OM content contributed to the formation of CaCO3. Therefore, the formation of pedogenic CaCO3 was a biotic process in the plant community dominated by A. ordosica.展开更多
基金Supported by the Special Fund for Agro-scientific Research in Public Interest in China(201503119-06-01)。
文摘To explore the effects of the two chelating agents on the availability of calcium and phosphorus in black soil of vegetable fields and the growth of cabbage(Brassica pekinensis Rupr.)seedlings,humic acid(F)and ethylene diamine tetraacetic acid disodium salt(EDTA)were used as experiment materials,and two factors and three levels completely randomized experiment of the nine treatments was set.The experiments were carried out by soil incubation experiment and pot experiment to investigate the effects of the two chelating agents with different ratios and their interaction on soil and cabbage.The results showed that there were very significant differences among soil pH,soil available phosphorus content,cabbage biomass,calcium and phosphorus accumulation of cabbage under the interaction of the two chelating agents.It could improve pH of the soil and reduce the electric conductivity(EC)value of soil,when applied chelating agents of different proportions.The EC value of soil fluctuated during the incubation period.There were significant differences between pH and EC in the early incubation period,but there was no significant difference in the later stage.And there were significant differences between soil available calcium and available phosphorus content;there were significant differences between cabbage biomass and the accumulation of calcium and phosphorus in cabbage,and the data of F2E2 treatment were significantly higher than those of other treatments.In summary,under the conditions of the experiment,the available phosphorus content of black soil in vegetable fields,the biomass and accumulation of calcium and phosphorus in cabbage increased significantly in F2E2 treatment(appied 675 kg•hm-2 of lime,300 kg•hm-2 of humic acid and 150 kg•hm-2 of EDTA).
基金Project supported by the Grant-in-Aid for Scientific Research from Ministry of Education, Science, Sport, and Technology of Japan (No.13876015).
文摘Previous studies have shown that porous hydrated calcium silicate （PS） is very effective in decreasing cadmium （Cd） content in brown rice. However, it is unclear whether the PS influences cadmium transformation in soil. The present study examined the effect of PS on pH, cadmium transformation and cadmium solubility in Andosol and Alluvial soil, and also compared its effects with CaCO3, acidic porous hydrated calcium silicate （APS） and silica gel. Soil cadmium was operationally fractionationed into exchangeable （Exch）, bound to carbonates （Carb）, bound to iron and manganese oxides （FeMnOx）, bound to organic matters （OM） and residual （Res） fraction. Application of PS and CaCO3 at hig rates enhanced soil pH, while APS and silica gel did not obviously change soil pH. PS and CaCO3 also increased the FeMnOx-Cd in Andosol and Carb-Cd in Alluvial soil, thus reducing the Exch-Cd in the tested soils. However, PS was less effective than CaCO3 at the same application rate. Cadmium fractions in the two soils were not changed by the treatments of APS and silica gel. There were no obvious differences in the solubility of cadmium in soils treated with PS, APS, silica gel and CaCO3 except Andosol treated 2.0% CaCO3 at the same pH of soil-CaC12 suspensions. These findings suggested that the decrease of cadmium availability in soil was mainly attributed to the increase of soil pH caused by PS.
文摘In order to test whether the long-term application of calcium superphosphate leads to an increase of the soil rare earth element contents, superphosphate fertilized soils were sampled and compared with superphosphate-free soils. Spectrophlame inductively coupled argon plasma atomic emission spectrophotometer （ICP-AES） was applied to quantify the rare earth elements （REEs）. The total rare earth element contents in calcium superphosphate from Zhijin County, west part of Guizhou Province, China （produced by the sulphuric acid treatment of the apatites） are about 2.54 mg/g. Between 38 and 189 gREEs/hm^2 per year （available for plants, estimated by 2% citric acid） will be introduced into the soil solution when applying 320 kg superphosphate/hm^2 per year. The long-term application of the latter will increase the REE content by about 18% in the soil surface layer in these areas. A statistically significant increase of the content of the rare earths in some cultivated soils should not be neglected.
文摘A pot experiment was conducted to investigate the effect of cow dung, rice husks, calcium chloride and gypsum on soil reclamation and compare the effect of organic and inorganic amendments on soil reclamation during the period of 5th March to 20th April, 2017. The experiment was laid to fit a completely randomized design (CRD) with seven treatments [Reference soil (T0), Cow dung (T1), Rice husk (T2), Gypsum (T3), Calcium chloride (T4), Cow dung + Rice husk (T5) and Gypsum + Calcium chloride (T6)] each having three replications for this experiment. After incubation (45 days), the laboratory investigation was carried out in the Soil, Water and Environment Discipline, Khulna University, Khulna, Bangladesh. Results indicate that the individual or combined effect of gypsum (T3) was more effective in changing EC and SAR. Gypsum application in combination with calcium chloride (T6) improved the soil chemical properties by reducing the EC. Among the treatment, calcium chloride (T4) had a remarkable effect in reducing sodium adsorption ratio and gypsum had a remarkable effect in reducing pH. Cow dung (T1), rice husk (T2), combination of cow dung and rice husk (T5) were less effective to reduce EC, pH and SAR. It’s measured for soils of different soil amendments varied significantly
基金Project supported by the National Basic Research Program (973 Program) of China (No. 2007CB106802)the National Natural Science Foundation of China (No. 30970546)
文摘Little attention has been paid to the role of soil organic matter （OM） in the formation of pedogenic carbonate in desert soils. The relationships among soil OM, soil dehydrogenase activity （DHA）, and soil CaCO3 in a plant community dominated by Artemisia ordosica, located on the eastern boundary of Tcngger Desert in the Alxa League, Inner Mongolia, China, were studied to understand whether OM was directly involved in the formation of pedogenic carbonate. The results showed that DHA and CuCO3 positively correlated with OM content, and DHA, OM, and CaCO3 were correlated with each other in their spatial distribution, indicating that abundant OM content contributed to the formation of CaCO3. Therefore, the formation of pedogenic CaCO3 was a biotic process in the plant community dominated by A. ordosica.
