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- W2385058937 abstract "In order to assess the ability of 0.02 mol L-1 SrCl2 and 0.01 mol L-1 CaCl2 as universal extractants for soil nitrogen and potassium,14 soil samples were extracted with these two extractants,nitrate +nitrite and potassium in the extracts were determined by flow analysis and flame spectrometry,respectively. Meanwhile 1 mol L-1 KCl and 1 mol L-1 neutral ammonium acetate were as the reference extractants for nitrogen and potassium,respectively. Some of the soil samples were used for pot experiment to determine nitrogen and potassium bioavailabilty. The results showed that extractable nitrate + nitrite and potassium by those two extractants correlated with that of reference extractants significantly(p0.01). Average extractable nitrate +nitrite of reference extractant,0.01 mol L-1 CaCl2,0.02 mol L-1 SrCl2 were 13.36,15.33 and 26.62 mg kg-1,respectively,average extractable potassium were 120.39,33.58 and 54.24 mg kg-1,respectively. Extractable nitrate +nitrite of the three extractants correlated with plant nitrogen uptake significantly (p0.05),while extractable potassium correlated were significant at p0.01 level. Compared with extracting nitrogen and potassium with different solutions,extracting nitrogen and potassium with universal extractants can reduce the cost of reagents considerably. The results suggested that extractable soil nitrogen and potassium with both 0.01 mol L-1 CaCl2 and 0.02 mol L-1 SrCl2 could be used to judge soil nitrogen and potassium concentration and availability,0.02 mol L-1 SrCl2 could extract more nitrogen and potassium than 0.01 mol L-1 CaCl2." @default.
- W2385058937 created "2016-06-24" @default.
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- W2385058937 date "2007-01-01" @default.
- W2385058937 modified "2023-09-23" @default.
- W2385058937 title "Comparison of CaCl_2 and SrCl_2 for Soil N and K Extraction" @default.
- W2385058937 hasPublicationYear "2007" @default.
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