共查询到20条相似文献,搜索用时 203 毫秒
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辽宁硼泥资源综合利用的探讨与对策 总被引:4,自引:0,他引:4
重点阐述了全省硼泥资源及其资源浪费和污染环境等情况。从而探讨、研究如何对硼泥资源进行开发、有效治理和综合利用,使其充分发挥经济效益和广泛的社会效益。 相似文献
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概述复混肥中硼含量现有的测定方法(比色法、酸碱滴定法、液相色谱法),比较它们的优缺点,针对不同复混肥特性及硼含量,探讨快速简便测定复混肥中硼含量的方法。 相似文献
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论述了一种含调节剂的生态肥料的应用以及主要广泛对土壤施用化肥的状况下,对农作物生长的影响,对化肥功能的作用以及对土壤生态环境的影响. 相似文献
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研究了NaHCO3溶液提取硼精矿熟料中硼的工艺,考察了液固比、NaHCO3用量、浸出温度、浸出时间和搅拌速率对硼提取率的影响. 结果表明,最佳提取工艺条件为液固质量比2.1:1,NaHCO3用量为理论用量的150%,反应温度100℃,反应时间1 h,搅拌速率400 r/min,该条件下硼浸出率达92.88%. 硼精矿熟料的晶形大多是柱状和扁平状,并有微小颗粒附着其表面;终硼泥为很多小晶体堆叠在一起,与硼精矿熟料相比,终硼泥颗粒变小,因此可用收缩核模型描述硼精矿熟料中硼在NaHCO3溶液中的浸出过程. 金云母、遂安石、利蛇纹石和橄榄石是硼精矿熟料的主要物相,而终硼泥出现了MgCO3和Na2Mg(CO3)2物相,遂安石消失. 相似文献
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A field experiment was conducted with lucerne on a strongly acidic and phosphorus deficient soil to determine the liming and phosphorus and nitrogen fertilizer value of an undigested, lime-treated sewage sludge. The results are presented in terms of calculated combinations of lime, nitrogen and phosphorus fertilizer required to obtain the same lucerne yield (or soil pH or extractable phosphorus level) as achieved with 5 or 10 t ha–1 of dried sludge.The sludge was a good source of lime, phosphorus and nitrogen. The sludge phosphorus was 49% as effective as the fertilizer phosphorus in raising extractable phosphorus in the soil to the level required for crop growth. The calcium carbonate of the sludge raised soil pH more effectively than agricultural lime, probably because of finer particle size in the former.It was not possible to achieve the yield obtained with 25 t ha–1 of sludge with combinations of agricultural lime, and nitrogen and phosphorus fertilizers at high rates of application. This was attributed to the effects of the sludge on improving soil physical properties. 相似文献
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Residual effectiveness of boron fertilizer for oilseed rape in intensively cropped rice-based rotations 总被引:2,自引:0,他引:2
Long-term field experiments (3–4 years) were conducted to evaluate the residual effect of boron (B) fertilizer for oilseed rape (Brassica napus L.) in an intensive crop rotation including two rice (Oryza sativa) crops per year. Experiments were conducted on four sites where the soil types were sandy, silty and clayey Inceptisols, and an Ultisol, located in the Zhejiang Province, Southeast China. Application of B fertilizer at rates of 1.1, 1.65 and 3.3 kg B/ha in the first year showed a different residual effect on oilseed yield in successive years, but had only small positive effects on the rice grain yield at two sites. The residual effect of 1.1 kg B/ha remained fully effective in correcting B deficiency in oilseed rape for 2 years in the Inceptisols, whereas the residual effect of 1.65 kg B/ha continued to correct B deficiency for at least 3 years in both the Inceptisols and the Ultisol. Foliar application of B fertilizer generally corrected B deficiency for oilseed rape but showed limited residual effect in the following years after application. The decline in residual values of B from a single fertilizer addition was closely related to the soil and leaf B concentration. Soil available B also decreased dramatically with the advance of rotation, but a larger decrease was found at a depth of 20–40-cm for the Inceptisols and the Ultisol. Thus, a more detailed understanding of the B cycling in the system is now needed to optimize management of B fertilizer. 相似文献