以羧甲基纤维素钠（CM C）为功能单体,K N O3为模板分子,18-冠醚-6（18-C-6）为致孔剂,去除模板离子（K（C））后制备了钾离子印迹膜层（K-IIM）.以戊二醛（G A）改性壳聚糖（CS）得到阴膜液,将阴膜液流延于上述K-IIM上形成了K（C）离...以羧甲基纤维素钠（CM C）为功能单体,K N O3为模板分子,18-冠醚-6（18-C-6）为致孔剂,去除模板离子（K（C））后制备了钾离子印迹膜层（K-IIM）.以戊二醛（G A）改性壳聚糖（CS）得到阴膜液,将阴膜液流延于上述K-IIM上形成了K（C）离子印迹双极膜（K-IIBPM）.采用扫描电镜（SEM）观察了K-IIBPM的形貌.K-IIM具有沟壑状的孔穴结构,孔穴半径约为0.130~0.170 nm,与K（C）的半径（0.137~0.164 nm）和形状相匹配,且具有规则性;经戊二醛改性后的阴膜层具有不规则的粗糙纹理.采用已循环使用十次的K-IIBPM富集海水中的钾,当海水中N a：K：Ca：M g的质量浓度（g L-1）比为10.70：0.41：0.42：1.32,压力差为0.03 M Pa,渗透时间为60 m in时,K（C）的透过率高达96%,其它被分离离子的截留率均在85%以上,从而实现富集海水中钾的目的.展开更多
Plant genotypic difference of pot assiu m-enr ich ment capab ility and p ot assi um (K ) d ist rib ut ion at root-soil ioterface of different plant genotypes were studied by using seven plant species and eight varieti...Plant genotypic difference of pot assiu m-enr ich ment capab ility and p ot assi um (K ) d ist rib ut ion at root-soil ioterface of different plant genotypes were studied by using seven plant species and eight varieties oftobacco (Nicotiana tabacum L.). The results indicated that K enrichment capability was: Ethiopian guizotia(Guizotia abyssinica Cass.)>feather cockscomb (Celosia arpentea L.)>alligator alternanthera (Alternantheraphiloxeroides (Mart.) Griseb.)> tobacco>sesbania (Sesbania cannabina (Retz.) Pers.)>wheat (Thticumaestivum L.)>broadbean (Vicia faba L.). Ethiopian guizotia showed very high K-enrichment capability atdifferent soil K levels, and the K content in its dry matter was over 110 mg kg-1 when soil K was fullysupplied, and about 60 mg kg-1 when no K fertilizer was applied. For alligator alternanthera, the capabilityto accumulate K was closely related with its growth medium. When it was grown on soils, both the K contentand K uptake rate of the plant were similar to those of tobacco. Evident K dep1etion was observed in therhizosphere of all plant species, and the depletion rate was related to the capability of K enrichment of plant.展开更多
Inorganic fertilizer NPK （nitrogen, phosphorus and potassium） （S） 25：5：5：5 is generally recommended for optimum yield and quality of tea （Camellia sinensis）. Non-judicious use of this inorganic fertilizer how...Inorganic fertilizer NPK （nitrogen, phosphorus and potassium） （S） 25：5：5：5 is generally recommended for optimum yield and quality of tea （Camellia sinensis）. Non-judicious use of this inorganic fertilizer however acidifies the soils and pollutes the environment. Integrated soil fertility management （ISFM） which involves the combined use of organic and inorganic fertilizer is recommended for improved crop yield and soil health. An experiment was carried out to determine the effect of enriching cattle manure with different ratios of inorganic fertilizers （OM： NPKS at ratios 1：2 and 1：4）, and rates on soil nutrient status, nitrogen uptake and yield of tea in the east of Rift Valley, Kenya. Enriching manures and organic manure up to a rate of 150 kg N/ha increased the level of P mature leaf. A higher N and K level in the mature leaf was observed when NPKS was applied at higher rates. In the soil, fertilizer rate up to 150 kg N/ha showed higher pH and K where organic manure and enriched manures were applied while NPKS treatment showed higher P content throughout the soil depths. Enriching organic manures with inorganic fertilizers increased yield significantly.展开更多
文摘以羧甲基纤维素钠（CM C）为功能单体,K N O3为模板分子,18-冠醚-6（18-C-6）为致孔剂,去除模板离子（K（C））后制备了钾离子印迹膜层（K-IIM）.以戊二醛（G A）改性壳聚糖（CS）得到阴膜液,将阴膜液流延于上述K-IIM上形成了K（C）离子印迹双极膜（K-IIBPM）.采用扫描电镜（SEM）观察了K-IIBPM的形貌.K-IIM具有沟壑状的孔穴结构,孔穴半径约为0.130~0.170 nm,与K（C）的半径（0.137~0.164 nm）和形状相匹配,且具有规则性;经戊二醛改性后的阴膜层具有不规则的粗糙纹理.采用已循环使用十次的K-IIBPM富集海水中的钾,当海水中N a：K：Ca：M g的质量浓度（g L-1）比为10.70：0.41：0.42：1.32,压力差为0.03 M Pa,渗透时间为60 m in时,K（C）的透过率高达96%,其它被分离离子的截留率均在85%以上,从而实现富集海水中钾的目的.
文摘Plant genotypic difference of pot assiu m-enr ich ment capab ility and p ot assi um (K ) d ist rib ut ion at root-soil ioterface of different plant genotypes were studied by using seven plant species and eight varieties oftobacco (Nicotiana tabacum L.). The results indicated that K enrichment capability was: Ethiopian guizotia(Guizotia abyssinica Cass.)>feather cockscomb (Celosia arpentea L.)>alligator alternanthera (Alternantheraphiloxeroides (Mart.) Griseb.)> tobacco>sesbania (Sesbania cannabina (Retz.) Pers.)>wheat (Thticumaestivum L.)>broadbean (Vicia faba L.). Ethiopian guizotia showed very high K-enrichment capability atdifferent soil K levels, and the K content in its dry matter was over 110 mg kg-1 when soil K was fullysupplied, and about 60 mg kg-1 when no K fertilizer was applied. For alligator alternanthera, the capabilityto accumulate K was closely related with its growth medium. When it was grown on soils, both the K contentand K uptake rate of the plant were similar to those of tobacco. Evident K dep1etion was observed in therhizosphere of all plant species, and the depletion rate was related to the capability of K enrichment of plant.
文摘Inorganic fertilizer NPK （nitrogen, phosphorus and potassium） （S） 25：5：5：5 is generally recommended for optimum yield and quality of tea （Camellia sinensis）. Non-judicious use of this inorganic fertilizer however acidifies the soils and pollutes the environment. Integrated soil fertility management （ISFM） which involves the combined use of organic and inorganic fertilizer is recommended for improved crop yield and soil health. An experiment was carried out to determine the effect of enriching cattle manure with different ratios of inorganic fertilizers （OM： NPKS at ratios 1：2 and 1：4）, and rates on soil nutrient status, nitrogen uptake and yield of tea in the east of Rift Valley, Kenya. Enriching manures and organic manure up to a rate of 150 kg N/ha increased the level of P mature leaf. A higher N and K level in the mature leaf was observed when NPKS was applied at higher rates. In the soil, fertilizer rate up to 150 kg N/ha showed higher pH and K where organic manure and enriched manures were applied while NPKS treatment showed higher P content throughout the soil depths. Enriching organic manures with inorganic fertilizers increased yield significantly.
