D. W. Gill

Gill, D. W., Kasuo, A., & Kamprath, E. J. (1991). Response of upland crops to potassium and lime applications in West Sumatra. Potash Review, 6(2), 9.

GILL, D. W., & KAMPRATH, E. J. (1990). POTASSIUM UPTAKE AND RECOVERY BY AN UPLAND RICE-SOYBEAN ROTATION ON AN OXISOL. AGRONOMY JOURNAL, 82(2), 329–333. https://doi.org/10.2134/agronj1990.00021962008200020031x