A.C. Schuffelen's scientific contributions

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Publications (2)

Potassium-exchange behavior of an illite
  • Article

February 1963

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13 Reads

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64 Citations

Netherlands Journal of Agricultural Science

J.C.H. Van Schouwenburg

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A.C. Schuffelen

The specificity of K adsorption on illite with respect to divalent cations can be explained by accepting the existence of three types of exchange sites, each of which shows a normal exchange process which may be described with the Gapon exchange equation. The K exchange on illite can be described mathematically as the sum of these three processes. Proof of the validity of the mathematical expression is presented. (Abstract retrieved from CAB Abstracts by CABI’s permission)

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Citations (2)

... Total nitrogen in the samples estimated by conventional Micro Kjeldahl's method. The percentage of protein in the immature pod was calculated by multiplying total nitrogen by factor 6.25 (Scheffelen et al., 1961) [13] . The data obtained from experiment was statistically analysed by appropriate procedure to randomized complete block design. ...

Reference:

Impact of organic nutrients on yield and quality of cluster bean [Cyamopsis tetragonoloba (L.) Taub.]
Quick tests for soil and plant analysis used by small laboratories
  • Citing Article

  • February 1961

Netherlands Journal of Agricultural Science

A.C. Schuffelen

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A. Muller

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J.CH. Van Schouwenburg

... The high correlation value (r = 0.81*) between the ratio of AR K and the exchange-able K in equilibrium (ΔK 0 ) indicates that K-labile greatly determines the availability of K in equilibrium (Table 3). Van Schouwenburg and Schuffelen (1963) suggested that theoretically, if the ratio of potassium activity (AR K ) value < 0.001, K is adsorbed at the "wedge" position or between layers (interlatice) and if the ratio of potassium activity value > 0.01, so K is ...

Reference:

Comparison of potassium quantity-intensity relationships in tropical paddy soil under tillage and no-tillage systems after fifteen growing seasons
Potassium-exchange behavior of an illite
  • Citing Article

  • February 1963

Netherlands Journal of Agricultural Science

J.C.H. Van Schouwenburg

·

A.C. Schuffelen