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《Agricultural Research in the Arid Areas》 1992-02
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The effectiveness of several methods derterming soil available or potentially available N in reflecting dryland soil N supply-capacities

Li shengxiu;Fu Huifang;Xiao Junzhang;Yuan Hulin(Northwestern Agricultural University,Yangling,shaanxi712100)  
Several pot experiments and field trials show that soil organic matter and total N canstably reflect soil N supplying-capacity,and are the important indices of soil fertility.However,their range of variatons is small,and their sensitivity is low,and therefore it is difficult toput them into practice.Soil nitrate is easy to be determined and is more sensitive to refectingsoil N supplying level and potential,and has bright prospect for use in practice.The mineral-ized N obtained by aerobic incubation is well correlated with N uptake by crops,but the Nreleased by water logged incubation is not.Also,good correlations exist between N releasedby NaOH hydrolysis or by boiling KCl and plant uptake N,and the amount of NO_3-N re-leased by EUF is much similar to that extracted by KCl.On dryiands,if the initial NO_3-N isincluded in the mineralized N obtained by any method(including NaOH-hydrolyzingmethod,aerobic and inaerobic incubation methods),the correlation between the obtained Nand plant uptake N is significantly increased.
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