By using field trials, the migration and transformation of coated controlled release nitrogen （YZS80） in soil under the co-situs application mode were studied. The results indicated that YZS80 nitrogen dissolved out...By using field trials, the migration and transformation of coated controlled release nitrogen （YZS80） in soil under the co-situs application mode were studied. The results indicated that YZS80 nitrogen dissolved out in average speed of about 0.4%/d and 32% totally in 80 d compared with common compound fertUizer. For YZS80, in the vertical downward direction of application points, urea nitrogen content increased significantly （P 〈0.05） in the 45 -80 d and the 30 -60 cm soil layers; nitrate nitrogen content was little change range and in moderate （10 -100 mg/kg） in 0 -80 d and 10 -60 cm soil layers, but increased significantly （ P 〈0.05） 45 -80 d compared to 0 -45 d; ammonium nitrogen content was significant lower （P〈0.05） before 45 d in 10 -30 cm soil layers, but significant higher（P〈0.05） after 45 d in 10 -60 cm soil layers; NO3^- -N/NH4^＋ -N meets gradually the needs of the crop with the extension of time. Under the co-situs application mode, the possibility of burning root and salt injury and loss dsk of nitrate leaching is a significant reduction.展开更多
ObjectiveThe aim was to explore the movement of nitrate nitrogen in tall-fescue soils by different kinds of slow release nitrogen fertilizers. MethodBased on infiltration-tanks and test plots, a new and environment fr...ObjectiveThe aim was to explore the movement of nitrate nitrogen in tall-fescue soils by different kinds of slow release nitrogen fertilizers. MethodBased on infiltration-tanks and test plots, a new and environment friendly fertilizer was explored. ResultThe results show that compared with urea treatment, slow-release nitrogen fertilizer treatments could reduce nitrate nitrogen content and leaching amount in soils. Compared with PCU30 and IU treatments, the PCU60 treatment became more efficient in reducing nitrate content and leaching amount in 0-90 cm soil layer. ConclusionIn summary, slow-release nitrogen fertilizer, which can reduce soil nitrate content and leaching losses, is a kind of novel fertilizer with high environmental benefit and promising application.展开更多
[Objective] The study aimed at comparing the characteristics of nutrient release from coated controlled/slow-release fertilizers,so as to provide theoretical reference for improving the farming practice and fertilizer...[Objective] The study aimed at comparing the characteristics of nutrient release from coated controlled/slow-release fertilizers,so as to provide theoretical reference for improving the farming practice and fertilizer application,reducing pollution in Baiyangdian Lake and the surrounding area.[Method] Soil column leaching method was used to study NH4-N and NO3-N leaching characteristics from five kinds of nitrogen fertilizers including three coated controlled/slow-release fertilizers.[Result] Resin and sulfur coated controlled/slow-release urea decreased NH4-N concentration obviously,controlled NO3-N release in early term of experiment,while increased the content of NH4-N ＋ NO3-N in middle-late periods.Compared with that of common urea,the NH4-N of resin and sulfur coated controlled/slow-release urea decreased by 98.5%,98.7% in early period,96.5%,97.4% in middle period,and 59.1%,81.75% in last period.[Conclusion] Resin and sulfur coated controlled/slow-release urea significantly reduced the NH4-N concentration,effectively controlled the NO3-N release in early stage and increased the supply of NO3-N in last period.展开更多
基金Supported by Beijing Science Committee Project"Science & TechnologyNew Star"(2008B38)"The Research and Establishmentof Agrochemical Service System for New Type of Fertilizer"(d0706004040431)The Foundation for Youth Scholars of BeijingAcademy of Agriculture and Forestry Sciences"The Developmentand Evaluation of Micro Water-soluble Cementation Coated Slow-releaseFertilizers Suitable for Semiand Areas"~~
文摘By using field trials, the migration and transformation of coated controlled release nitrogen （YZS80） in soil under the co-situs application mode were studied. The results indicated that YZS80 nitrogen dissolved out in average speed of about 0.4%/d and 32% totally in 80 d compared with common compound fertUizer. For YZS80, in the vertical downward direction of application points, urea nitrogen content increased significantly （P 〈0.05） in the 45 -80 d and the 30 -60 cm soil layers; nitrate nitrogen content was little change range and in moderate （10 -100 mg/kg） in 0 -80 d and 10 -60 cm soil layers, but increased significantly （ P 〈0.05） 45 -80 d compared to 0 -45 d; ammonium nitrogen content was significant lower （P〈0.05） before 45 d in 10 -30 cm soil layers, but significant higher（P〈0.05） after 45 d in 10 -60 cm soil layers; NO3^- -N/NH4^＋ -N meets gradually the needs of the crop with the extension of time. Under the co-situs application mode, the possibility of burning root and salt injury and loss dsk of nitrate leaching is a significant reduction.
基金Supported by Special Fund for Agro-scientific Research in the Public Interest(201003014)Youth Foundation of Beijing Academy of Agricultural and Forestry Sciences(QNJJ201311)~~
文摘ObjectiveThe aim was to explore the movement of nitrate nitrogen in tall-fescue soils by different kinds of slow release nitrogen fertilizers. MethodBased on infiltration-tanks and test plots, a new and environment friendly fertilizer was explored. ResultThe results show that compared with urea treatment, slow-release nitrogen fertilizer treatments could reduce nitrate nitrogen content and leaching amount in soils. Compared with PCU30 and IU treatments, the PCU60 treatment became more efficient in reducing nitrate content and leaching amount in 0-90 cm soil layer. ConclusionIn summary, slow-release nitrogen fertilizer, which can reduce soil nitrate content and leaching losses, is a kind of novel fertilizer with high environmental benefit and promising application.
基金Supported by Knowledge Innovation Project of the Chinese Academy of Sciences(KZCX2-YW-449)~~
文摘[Objective] The study aimed at comparing the characteristics of nutrient release from coated controlled/slow-release fertilizers,so as to provide theoretical reference for improving the farming practice and fertilizer application,reducing pollution in Baiyangdian Lake and the surrounding area.[Method] Soil column leaching method was used to study NH4-N and NO3-N leaching characteristics from five kinds of nitrogen fertilizers including three coated controlled/slow-release fertilizers.[Result] Resin and sulfur coated controlled/slow-release urea decreased NH4-N concentration obviously,controlled NO3-N release in early term of experiment,while increased the content of NH4-N ＋ NO3-N in middle-late periods.Compared with that of common urea,the NH4-N of resin and sulfur coated controlled/slow-release urea decreased by 98.5%,98.7% in early period,96.5%,97.4% in middle period,and 59.1%,81.75% in last period.[Conclusion] Resin and sulfur coated controlled/slow-release urea significantly reduced the NH4-N concentration,effectively controlled the NO3-N release in early stage and increased the supply of NO3-N in last period.
