Palygorskite is natural and nanometer-sized ecological function material, due to its good adsorbability and slow-releasing effect; it can be used as neurotrophic agents of crop and slow-release formulation of fertilizer in ecological agriculture. To further prove its ecological function, the field experiment has been made to study the effect of fertilizer coated with ecological function material palygorskite on the yield and quality of potato, and the result showed that: ecological function material palygorskite fertilizer could effectively faise potato outputs and improve its quality. Single application of palygorskite could make the yield increased by 17.38%, and compound fertilizer with it could increase by 46.85%-59.95%; Single application of palygorskite could increase the starch content of potato by 0.24%, and compound fertilizer with it could increase by 46.85%-59.95%.So the results also showed that palygorskite has slow-releasing effect on fertilizer.

The yield-increasing and slowly releasing effects of palygorskite coated fertilizer were investigated with pot experiment.The result showed that application of diammonium phosphate coated with palygorskite at 225 kg·hm-2,the effective siliquae and yield of rape(Brussica napus) increased by 2.27 % and 255.33 % respectively compared with control.The biomass of wheat which planted after rape increased by 57.67 % when compared with control at 300 kg·hm-2.The content of chlorophyll,protein and soluble sugar in rape at latter growth stage were higher than that of the control,while MDA content was lower.It is suggested that palygorskite coated fertilizer shows good anti-aging and adverse-resistance characteristics,it also has certain slow release property on diammonium phosphate.

This paper carried out pot experiment of palygorskite coated urea on the impact of spring wheat yield and aftereffect,evaluated its ecological significance for the scientific issues with improving the fertilizer utilization factor.The results showed that palygorskite coated urea could effectively improve the economic yield,biomass yield,economic coefficient,thousand grain weight and grain number per ear of spring wheat,increase yield and fertilizer utilization fator of it,raised fertilizer aftereffects.Therefore,it suggested that palygorskite could be used as a slowly-releasing fertilizer coating material to apply in practice,which had ecological significance in a certain.

Spring wheat pot experiments were used to study the slow release effect and mechanism of palygorskite coated fertilizer. The results show that palygorskite coated phosphorus helps to make a slow release of fertilizer, to increase the weight per 1 000 grains, the economic coefficients, the economic yield, and the biomass of spring wheat, and to promote the transformation of biochemistry matter in spring wheat and the delayed aging. Therefore, palygorskite can be used as a new type of slow -release fertilizer coating materials in production.

A pot experiment was conducted to study the nitrogen release dynamics of a PAL fertilizer and its effects on economic characters and yield of barley.It was observed that there was no significant difference in NH~+_4-N release between PAL fertilizer and urea treatment.The trend of NO~-_3-N release was similarly S type curve,and there was a very significant difference.During the whole growth period of barley,there were two stages of nitrogen release from PAL fertilizer: the first stage was 0～14 d and the second stage was 28～42 d after applied.The function of nitrogen release from PAL fertilizer was satisfied with the nutrient demand of crop.Under the same nitrogen level,the yield of barley treated with PAL fertilizer was higher than that with urea.In the range of 0～7 kg/667m~2,as the nitrogen levels ascended,the yield of barley increased;in the range of 7～14 kg/667m~2,as the nitrogen levels ascended,the yield of barley descended.

本文进行了用PAL材料作为天然矿物饲料添加剂对鸡蛋、鸡肉中微量元素含量的影响研究.结果表明,鸡蛋中I、Se、Zn元素的平均含量分别为38.025mg/kg、0.387mg/kg和14.698mg/kg,较对照组0.678mg/kg、0.202mg/kg、13.734mg/kg增加了55倍、0.9l倍和0.93倍;鸡肉中I、Se、Zn元素的平均含量较对照组增加91.6倍、2.3倍和1.2倍.

PAL生物工程材料(简称PAL材料,俗名坡缕石、又称凹凸棒石),英文材料PAL,它的生物工程特征表现为药物、生物活性物质载体的功能,富含微量生命元素.

用含有多种天然微量营养元素的甘肃临泽县凹凸棒粘土替代部分饲料饲喂蛋鸡.结果表明,饲料中添加1 %～2 %的凹凸棒粘土,可使产蛋率及平均蛋重略有提高,还可使鸡蛋中碘、硒、锌等营养元素的含量明显增多,其中碘含量由0.678 mg/kg增加到38.025 mg/kg;有害元素铅的含量明显降低,砷、汞、氟的检出量很少或没有检出.

Attapulgite deposits are rare and valuable in the world. Large iodic attapulgite deposits with total reserves of 2?500 million tons were found in central and western Gansu Province. High iodine exists in attapulgite ores. There is about 0.0418% iodine in western attapulgite ore and 0.0425% in central ore, which are almost the same as the iodine content of niter in Chile. Total reserves of iodine are up to 117,000 tons, with water-soluble iodine higher than 80%. The output of eggs is obviously raised by using iodic attapulgite as chicken feed additives and the iodine content of eggs can reach 22～57 mg/kg.