Journal article

Publication year: 1990

Pages: 211-214

Journal: Biology and Fertility of Soils

Volume number: 9

Issue number: 3

ISSN: 0178-2762

eISSN: 1432-0789

DOI Link: https://doi.org/10.1007/BF00336227

Publisher: Springer

Abstract: 
The turnover of interlayer NH4+ in a loess-derived agricultural soil from the Shaanxi Province in China was studied. The concentration of 15N-labeled interlayer NH4+ and total interlayer NH4+ (labeled + unlabeled) in a soil grown with winter wheat was significantly higher at the beginning of the season (March) than when the crop was mature (June). In a further experiment with winter wheat it was shown that under field conditions the concentration of interlayer NH4+ decreased significantly in the two upper soil layers (0-20 and 20-55 cm) during March and in the deeper soil layer (55-75 cm) during April. When the heading stage of wheat was reached, about 200 kg N ha-1 of interlayer NH4+ had been released. During the following growth period (heading until flowering of wheat) the concentration of interlayer NH4+ increased significantly in the upper soil layers. Fertilizer application in the form of 70 kg N ha-1 as urea led to a considerable increase in the nitrate concentration in the upper soil layer but had no influence on the level of interlayer NH4+ concentration. It is concluded that interlayer NH4+ takes part in the N cycle of the soil and that it contributes to the N nutrition of the crop NH4+ originating from the mineralization of soil organic N may be rapidly incorporated into the interlayer of clay minerals and later released, when the N demand of the crop is high.

Harvard Citation style: LI, C., FAN, X. and MENGEL, K. (1990) TURNOVER OF INTERLAYER AMMONIUM IN LOESS-DERIVED SOIL GROWN WITH WINTER-WHEAT IN THE SHAANXI PROVINCE OF CHINA, Biology and Fertility of Soils, 9(3), pp. 211-214. https://doi.org/10.1007/BF00336227

APA Citation style: LI, C., FAN, X., & MENGEL, K. (1990). TURNOVER OF INTERLAYER AMMONIUM IN LOESS-DERIVED SOIL GROWN WITH WINTER-WHEAT IN THE SHAANXI PROVINCE OF CHINA. Biology and Fertility of Soils. 9(3), 211-214. https://doi.org/10.1007/BF00336227