Soil salinity is a major limiting factor for crop production in coastal areas of Bangladesh. Cheap and sustainable management of soil salinity is hence most sought out topics in agricultural research. Conceptualizing ...Soil salinity is a major limiting factor for crop production in coastal areas of Bangladesh. Cheap and sustainable management of soil salinity is hence most sought out topics in agricultural research. Conceptualizing that idea in mind, a pot experiment was conducted in the Department of Soil, Water & Environment, University of Dhaka in order to analyze if common organic amendments (rice straw, saw dust) coupled with reduce photoperiod can mitigate salinity effect on the growth of bean (Phaseolus vulgaris). The experiment was set up following completely randomized design (CRD) with nine treatments and three replications containing Tc (Control), T1 (Ambient photoperiod + 110 mM Salinity treatment + Rice straw), T2 (Reduced photoperiod + 110 mM Salinity treatment + Rice straw), T3 (Ambient photoperiod + 220 mM Salinity treatment + Rice straw), T4 (Reduced photoperiod + 220 mM Salinity treatment + Rice straw), T5 (Ambient photoperiod + 110 mM Salinity treatment + Saw dust), T6 (Reduced photoperiod + 110 mM Salinity treatment + Saw dust), T7 (Ambient photoperiod + 220 mM Salinity treatment + Saw dust) and T8 (Reduced photoperiod + 220 mM Salinity treatment + Saw dust). Organic amendments were used separately at the rate of 12 ton/ha. The highest plant height (98.67 cm), root length (12.5 cm), pod number (10.33), leaf area (13.99 cm2), fresh weight (680 kg/ha), dry weight (316.67 kg/ha) were recorded with the treatment T1 while the second-best treatment was treatment T2 (with highest harvest index 0.040) and these results were statistically significant (p < 0.001). In post-harvest soil, pH, EC, OC, OM;available N, P, K, S;total Ca, Mg, Zn, Mn were increased significantly in treatment T1. The overall results illustrated that the best growth and yield performances were achieved in the treatment T1 and T2.展开更多
以重庆市九龙坡区白市驿镇蔬菜基地为试验平台,通过大田试验,研究了锯木灰渣不同施用量还田1年后对酸性紫色土改良效果,并进一步分析了锯木灰渣对土壤微生物群落及微生物碳、氮的影响,以期为紫色菜园退化土壤养分和酸化的修复提供合理措...以重庆市九龙坡区白市驿镇蔬菜基地为试验平台,通过大田试验,研究了锯木灰渣不同施用量还田1年后对酸性紫色土改良效果,并进一步分析了锯木灰渣对土壤微生物群落及微生物碳、氮的影响,以期为紫色菜园退化土壤养分和酸化的修复提供合理措施,同时实现循环农业的可持续发展。结果表明:(1)锯木灰渣施用能显著提高蔬菜产量,且随着施用量的增加呈增加趋势,其中锯木灰渣施用量为18 000 kg hm^(-2)时,产量较未施用锯木灰渣(A0)处理显著提高了76.1%~121.9%;(2)经锯木灰渣处理的退化紫色土表层和亚表层的有机质含量和pH提高,尤其是锯木灰渣施用量为18 000 kg hm^(-2)的改良效果较佳,但是过高的锯木灰渣施用量处理对土壤交换性H^+、Al^(3+)效果反而下降,而施用量为12 000~15 000 kg hm^(-2)处理的效果较佳,其中表层土壤交换性H^+、Al^(3+)分别为0.19~0.20,0.63~0.67 cmol kg^(-1);(3)12 000~15 000 kg hm^(-2)的锯木灰渣施用量对土壤碱解氮和速效钾的提升效果较佳,18 000 kg hm^(-2)处理的有效磷含量最大,较A0处理增加了55.3 mg kg^(-1);(4)无论在表层土壤还是亚表层土壤中,细菌的种群数量分布最多,其次为真菌和放线菌,分别在12 000,9 000,6 000 kg hm^(-2)锯木灰渣施用量下的种群数量达到最大值;9 000~12 000 kg hm^(-2)处理对提高表层土壤微生物量碳含量较为明显,较A0显著提高了70.4%~78.7%,18 000 kg hm^(-2)处理的土壤微生物生物量氮(SMBN)含量最大(40.54 mg kg^(-1)),其次为9 000 kg hm^(-2)处理(34.32 mg kg^(-1))。综上,锯木灰渣施用量为12 000~15 000 kg hm^(-2)时对退化紫色土的改良效果较好。展开更多
以回收提纯硅片线锯屑粉与气相白炭黑为原料,合成出晶须状氮氧化硅粉体。实验研究了原料摩尔配比、保温温度、保温时间等工艺参数对氮氧化合成产物的影响。结果表明,回收提纯硅片线锯屑粉与气相白炭黑摩尔比为2.0∶1~2.6∶1、保温温度为...以回收提纯硅片线锯屑粉与气相白炭黑为原料,合成出晶须状氮氧化硅粉体。实验研究了原料摩尔配比、保温温度、保温时间等工艺参数对氮氧化合成产物的影响。结果表明,回收提纯硅片线锯屑粉与气相白炭黑摩尔比为2.0∶1~2.6∶1、保温温度为1380℃、保温时间为4 h条件下可获得较为纯净的氮氧化硅粉体。产物中同时伴生一种类似于O1-Si Al ON结构的氮氧化硅低温亚稳相（LM Si2N2O）,且该亚稳相含量随着原料摩尔配比的降低、温度的升高、时间的延长逐渐降低。所形成的氮氧化硅呈晶须状的原因与白炭黑的气化挥发及随后的氮氧化硅气相沉积生长机制有关。展开更多
文摘Soil salinity is a major limiting factor for crop production in coastal areas of Bangladesh. Cheap and sustainable management of soil salinity is hence most sought out topics in agricultural research. Conceptualizing that idea in mind, a pot experiment was conducted in the Department of Soil, Water & Environment, University of Dhaka in order to analyze if common organic amendments (rice straw, saw dust) coupled with reduce photoperiod can mitigate salinity effect on the growth of bean (Phaseolus vulgaris). The experiment was set up following completely randomized design (CRD) with nine treatments and three replications containing Tc (Control), T1 (Ambient photoperiod + 110 mM Salinity treatment + Rice straw), T2 (Reduced photoperiod + 110 mM Salinity treatment + Rice straw), T3 (Ambient photoperiod + 220 mM Salinity treatment + Rice straw), T4 (Reduced photoperiod + 220 mM Salinity treatment + Rice straw), T5 (Ambient photoperiod + 110 mM Salinity treatment + Saw dust), T6 (Reduced photoperiod + 110 mM Salinity treatment + Saw dust), T7 (Ambient photoperiod + 220 mM Salinity treatment + Saw dust) and T8 (Reduced photoperiod + 220 mM Salinity treatment + Saw dust). Organic amendments were used separately at the rate of 12 ton/ha. The highest plant height (98.67 cm), root length (12.5 cm), pod number (10.33), leaf area (13.99 cm2), fresh weight (680 kg/ha), dry weight (316.67 kg/ha) were recorded with the treatment T1 while the second-best treatment was treatment T2 (with highest harvest index 0.040) and these results were statistically significant (p < 0.001). In post-harvest soil, pH, EC, OC, OM;available N, P, K, S;total Ca, Mg, Zn, Mn were increased significantly in treatment T1. The overall results illustrated that the best growth and yield performances were achieved in the treatment T1 and T2.
文摘以重庆市九龙坡区白市驿镇蔬菜基地为试验平台,通过大田试验,研究了锯木灰渣不同施用量还田1年后对酸性紫色土改良效果,并进一步分析了锯木灰渣对土壤微生物群落及微生物碳、氮的影响,以期为紫色菜园退化土壤养分和酸化的修复提供合理措施,同时实现循环农业的可持续发展。结果表明:(1)锯木灰渣施用能显著提高蔬菜产量,且随着施用量的增加呈增加趋势,其中锯木灰渣施用量为18 000 kg hm^(-2)时,产量较未施用锯木灰渣(A0)处理显著提高了76.1%~121.9%;(2)经锯木灰渣处理的退化紫色土表层和亚表层的有机质含量和pH提高,尤其是锯木灰渣施用量为18 000 kg hm^(-2)的改良效果较佳,但是过高的锯木灰渣施用量处理对土壤交换性H^+、Al^(3+)效果反而下降,而施用量为12 000~15 000 kg hm^(-2)处理的效果较佳,其中表层土壤交换性H^+、Al^(3+)分别为0.19~0.20,0.63~0.67 cmol kg^(-1);(3)12 000~15 000 kg hm^(-2)的锯木灰渣施用量对土壤碱解氮和速效钾的提升效果较佳,18 000 kg hm^(-2)处理的有效磷含量最大,较A0处理增加了55.3 mg kg^(-1);(4)无论在表层土壤还是亚表层土壤中,细菌的种群数量分布最多,其次为真菌和放线菌,分别在12 000,9 000,6 000 kg hm^(-2)锯木灰渣施用量下的种群数量达到最大值;9 000~12 000 kg hm^(-2)处理对提高表层土壤微生物量碳含量较为明显,较A0显著提高了70.4%~78.7%,18 000 kg hm^(-2)处理的土壤微生物生物量氮(SMBN)含量最大(40.54 mg kg^(-1)),其次为9 000 kg hm^(-2)处理(34.32 mg kg^(-1))。综上,锯木灰渣施用量为12 000~15 000 kg hm^(-2)时对退化紫色土的改良效果较好。
文摘以回收提纯硅片线锯屑粉与气相白炭黑为原料,合成出晶须状氮氧化硅粉体。实验研究了原料摩尔配比、保温温度、保温时间等工艺参数对氮氧化合成产物的影响。结果表明,回收提纯硅片线锯屑粉与气相白炭黑摩尔比为2.0∶1~2.6∶1、保温温度为1380℃、保温时间为4 h条件下可获得较为纯净的氮氧化硅粉体。产物中同时伴生一种类似于O1-Si Al ON结构的氮氧化硅低温亚稳相（LM Si2N2O）,且该亚稳相含量随着原料摩尔配比的降低、温度的升高、时间的延长逐渐降低。所形成的氮氧化硅呈晶须状的原因与白炭黑的气化挥发及随后的氮氧化硅气相沉积生长机制有关。
