以淮山为研究对象,旨在明确淮山生产中的氮钾肥适宜用量及镁硼肥配施效应,以期为高产优质淮山生产和合理施肥提供科学依据。设置3个氮肥用量水平(270、360、450 kg N/hm^2)和3个钾肥用量水平(270、360、450 kg K_2O/hm^2),研究在等量有...以淮山为研究对象,旨在明确淮山生产中的氮钾肥适宜用量及镁硼肥配施效应,以期为高产优质淮山生产和合理施肥提供科学依据。设置3个氮肥用量水平(270、360、450 kg N/hm^2)和3个钾肥用量水平(270、360、450 kg K_2O/hm^2),研究在等量有机肥(精制有机肥4500 kg/hm^2)和磷肥(144 kg P2O5/hm^2)基础上配施不同用量钾氮肥并添加镁(22.5 kg Mg/hm^2)硼(0.21 kg B/hm^2)肥对淮山叶绿素含量、生物量、品质、养分吸收量和产量的影响。研究结果表明:氮钾肥不同用量对淮山块根膨大期和收获期叶片SPAD值无显著影响。配施Mg和B明显提高淮山可溶性蛋白和氨基酸态氮含量。随施N量或施K量的增加,生产100 kg淮山N、K的需求量均呈先增加后下降趋势。在360 kg N/hm^2基础上配施450 kg K_2O/hm^2或在360 kg N/hm^2和360 kg K_2O/hm^2基础上配施22.5 kg Mg/hm^2均明显提高淮山块根重量、总生物量和淮山产量。增施钾肥和配施Mg均有利于提高淮山N和K的收获指数。为获得70000～90000 kg/hm^2的淮山产量,建议在施用4500 kg/hm^2精制有机肥、360 kg N/hm^2、144 kg P_2O_5/hm^2基础上配施450 kg K_2O/hm^2或配施360 kg K_2O/hm^2和22.5 kg Mg/hm^2。展开更多
The isothermal desorption kinetics of the 1.1MgH2-2LiNH2-0.1LiBH4 system were improved by addition of LaNi4.5Mn0.5 alloy. The hydrogen desorption peak temperature of the sample containing LaNi4.5Mn0.5 reduced by appro...The isothermal desorption kinetics of the 1.1MgH2-2LiNH2-0.1LiBH4 system were improved by addition of LaNi4.5Mn0.5 alloy. The hydrogen desorption peak temperature of the sample containing LaNi4.5Mn0.5 reduced by approximately 5 K and the activation energy reduced by 9%. The results of isothermal dehydrogenation kinetics analysis implied that the isothermal desorption process at initial stage was controlled by the phase boundary mechanism. Moreover, the cycle performance of the materials was extended. The growth and agglomeration of the sample particles caused the deterioration of kinetics during de-/hydrogenation cycles, and then resulted in an incomplete desorption/absorption reaction which were responsible for the capacity fading. The cracking and pulverization of LaNi4.5Mn0.5 alloy had an obvious effect on preventing the composites aggregating, and the fine alloy particles could enhance the catalytic effect of the alloy, thus effectively offsetting part of the deterioration of kinetics caused by particles growth.展开更多
文摘以淮山为研究对象,旨在明确淮山生产中的氮钾肥适宜用量及镁硼肥配施效应,以期为高产优质淮山生产和合理施肥提供科学依据。设置3个氮肥用量水平(270、360、450 kg N/hm^2)和3个钾肥用量水平(270、360、450 kg K_2O/hm^2),研究在等量有机肥(精制有机肥4500 kg/hm^2)和磷肥(144 kg P2O5/hm^2)基础上配施不同用量钾氮肥并添加镁(22.5 kg Mg/hm^2)硼(0.21 kg B/hm^2)肥对淮山叶绿素含量、生物量、品质、养分吸收量和产量的影响。研究结果表明:氮钾肥不同用量对淮山块根膨大期和收获期叶片SPAD值无显著影响。配施Mg和B明显提高淮山可溶性蛋白和氨基酸态氮含量。随施N量或施K量的增加,生产100 kg淮山N、K的需求量均呈先增加后下降趋势。在360 kg N/hm^2基础上配施450 kg K_2O/hm^2或在360 kg N/hm^2和360 kg K_2O/hm^2基础上配施22.5 kg Mg/hm^2均明显提高淮山块根重量、总生物量和淮山产量。增施钾肥和配施Mg均有利于提高淮山N和K的收获指数。为获得70000～90000 kg/hm^2的淮山产量,建议在施用4500 kg/hm^2精制有机肥、360 kg N/hm^2、144 kg P_2O_5/hm^2基础上配施450 kg K_2O/hm^2或配施360 kg K_2O/hm^2和22.5 kg Mg/hm^2。
基金Project supported by High-Tech Research and Development Program of China(2012AA051503)
文摘The isothermal desorption kinetics of the 1.1MgH2-2LiNH2-0.1LiBH4 system were improved by addition of LaNi4.5Mn0.5 alloy. The hydrogen desorption peak temperature of the sample containing LaNi4.5Mn0.5 reduced by approximately 5 K and the activation energy reduced by 9%. The results of isothermal dehydrogenation kinetics analysis implied that the isothermal desorption process at initial stage was controlled by the phase boundary mechanism. Moreover, the cycle performance of the materials was extended. The growth and agglomeration of the sample particles caused the deterioration of kinetics during de-/hydrogenation cycles, and then resulted in an incomplete desorption/absorption reaction which were responsible for the capacity fading. The cracking and pulverization of LaNi4.5Mn0.5 alloy had an obvious effect on preventing the composites aggregating, and the fine alloy particles could enhance the catalytic effect of the alloy, thus effectively offsetting part of the deterioration of kinetics caused by particles growth.
