Assessing suitability of different extractants for determining available boron in soil

In the present study, the extractability of available Boron (B) by different extractants was tested in relation to soil properties. Soil samples from different parts of Indo-Gangetic flood plains of West Bengal were collected and available B extracted with various extractant viz. hot calcium chloride (CaCl₂) (HCC), Potassium di-hydrogen phosphate (PDP), tartaric acid (TA) and MCC. Plant availability of B was assessed by growing wheat (Triticum aestivum L.cv.K-1006) in such soils through pot experiments. HCC showed the highest available B content as well as highest correlation coefficient value with all plant growth parameters and soil properties. The B extracting efficiency of the tested extractants was found in the order of HCC > PDP > TA > MCC. Results showed that dry matter yield, plant B concentration and uptake was increased significantly after application of Borax. Linear Correlations, Multiple regression analysis using Mallow's Cp statistics proved HCC to be the best extractant for estimating available B in experimental soils.     

中药提取剂对乳酸菌体外培养增殖的影响

本试验选用党参、黄芪、枸杞、山楂、女贞子和杜仲叶以煎煮法制备提取液进行乳酸杆菌体外增殖试验。试验结果显示,除枸杞外,其余5味中药均对乳酸杆菌有增殖作用,但以女贞子20～40mg/mL、黄芪20mg/mL、杜仲叶80mg/mL和党参80～100mg/mL的增殖效果显著(P<0.05),由此表明添加量对乳酸菌的增殖作用有较大影响。