Physical and chemical properties of a durably efficacious ammonium bicarbonate as a fertilizer and its yield-increasing mechanism

A new fertilizer of cocrystal type,known as durably efficacious ammonium bicarbonate (DEAB),has been developed by adding a certain amount of dicyandiamide (DCD) as an ammonia-stabilizing agent to ammonium bearbenate(AB)during the process of its production.As compared with AB,DEAB was found to have a reduction of direct volatilization loss by 53%,a fertilizer availability period prolonged from 35-45 to 90-110 d,and an increase in the rate of nitrogen in fertilizer being utilized by 5.9%-10.2%,and a saving of the amount of fertilizer to be ap-phed by 20%-30% for the same level of yield,or an increase of the crop yield by over 10% for the same level of ni-tregen fertilization;in addition,it was found to show usually a function of promoting the crop to early mature.It can be apptied as basal dressing all in one time to soil and thus also used as a labour-saving and crop yield-increasing fertil-izer for is non-mtertillage,plastics film covering and water-saving agriculture     

土壤中铜、锌、锰、铁、铬、镍、钙、镁的原子吸收分光光度法

近年来,原子吸收分光光度分析得到广泛应用,其优点是被测元素具有高度的选择性,同时灵敏度高、操作简便,尤其适于分析成分复杂的土壤样品。经试验,一次称样用酸分解后,将备测液稀释二次,在空气-乙炔火焰中能快速而准确地测定铜、锌、锰、铁、铬、镍、钙、镁等八种元素,如有氧化亚氮气体还可以测定     

长效碳酸氢铵理化特性及增产机理的研究

在碳酸氢铵(下称普通碳铵)生产过程中,定量加入一种有机化合物DCD(下称氨稳定剂),形成共结晶型新肥种,称之为长效碳酸氢铵(下称长效碳铵)。其特点是:减缓直接挥发损失率47％;肥效期由35～45d延长到90～110d;氮素利用率提高5.9～10.2个百分点;在同等产量水平下可节肥20％～30％;在等氮量施肥条件下增产率为10％,常显示出有促进作物早熟功能。可作基肥1次施入,为免中耕、覆膜和节水农业提供了节约劳力而增产的肥料。     

小麦根系中有机酸的离子色谱法分析研究

研究了离子交换和离子排斥法用于小麦根系中有机酸分析的色谱条件,首次建立了植物报系中有机酸的高子色谱分析方法。分别用Ｎａ＿２ＣＯ＿３／ＮａＨＣＯ＿３,Ｎａ＿２ＣＯ＿３／ＮａＯＨ和ＨＣｌ作离子交换和离子排斥分高的流动相,选用化学抑制型电导检测器。对样品中柠檬酸、苹果酸、丁二酸、反丁烯二酸、乙酸、草酸的检测限为Ｏ１～０．５μｇ／ｍＬ,相对标准偏差为１．７８％～２．９７％,样品加标回收率为１００±１０％。