Preliminary study of three methods for simultaneous determination of soil nitrogen and phosphorus

Lim C.K., . and Lau C.H., . and Mohd Napi D., . (1997) Preliminary study of three methods for simultaneous determination of soil nitrogen and phosphorus. [Proceedings Paper]

Nitrogen and phosphorus in soils under Hevea cultivation were determined three chemical extraction procedures which are : I H2O2 oxidation followed by digestion with Se H2SO4 salicylic acid mixture II digestion with Se H2SO4 salicylic acid mixture and III digestion with HClO4 H2SO4 mixture. Analytical results of sixteen randomly selected surface soils showed that P determined by III were comparatively higher than those obtained from I and II. Nitrogen values by I and II are in fairly good agreement and they are generally higher than the corresponding values derived from III. With the exception of N by I mean coefficients of variation of N and P over all samples are less than 8.1 suggesting that the precision and accuracy of the three methods are reasonably good. Linear regression analysis of data obtained from 57 different soil samples showed that P by I II and III are closely interrelated with correlation coefficients. r 0.96. For N only I and II are highly correlated r 0.96. Since total N is routinely determined by II and P by II is also closely related to total P commonly determined by III it appears that II can be used for the simultaneous determination and assessment of total soil N and P status. Although I can be an alternative the relatively more simple method II is preferred.

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Abstract

Nitrogen and phosphorus in soils under Hevea cultivation were determined three chemical extraction procedures which are : I H2O2 oxidation followed by digestion with Se H2SO4 salicylic acid mixture II digestion with Se H2SO4 salicylic acid mixture and III digestion with HClO4 H2SO4 mixture. Analytical results of sixteen randomly selected surface soils showed that P determined by III were comparatively higher than those obtained from I and II. Nitrogen values by I and II are in fairly good agreement and they are generally higher than the corresponding values derived from III. With the exception of N by I mean coefficients of variation of N and P over all samples are less than 8.1 suggesting that the precision and accuracy of the three methods are reasonably good. Linear regression analysis of data obtained from 57 different soil samples showed that P by I II and III are closely interrelated with correlation coefficients. r 0.96. For N only I and II are highly correlated r 0.96. Since total N is routinely determined by II and P by II is also closely related to total P commonly determined by III it appears that II can be used for the simultaneous determination and assessment of total soil N and P status. Although I can be an alternative the relatively more simple method II is preferred.

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Item Type:	Proceedings Paper
AGROVOC Term:	HEVEA BRASILIENSIS
AGROVOC Term:	SOIL
AGROVOC Term:	SOIL CHEMISTRY
AGROVOC Term:	SOIL CHEMICOPHYSICAL PROPERTIES
AGROVOC Term:	NITROGEN
AGROVOC Term:	PHOSPHORUS
AGROVOC Term:	MALAYSIA
Geographical Term:	MALAYSIA
Depositing User:	Ms. Norfaezah Khomsan
Last Modified:	24 Apr 2025 05:27
URI:	http://webagris.upm.edu.my/id/eprint/16220

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