POTASSIUM STATUS IN THE SOILS OF BAHTIM PERMANENT EXPERIMENT UNDER DIFFERENT CROP ROTATIONS AND FERTILIZER TREATMENTS | ||
| Egyptian Journal of Agricultural Research | ||
| Article 1, Volume 92, Issue 4, December 2014, Pages 1207-1215 PDF (496.71 K) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/ejar.2015.155943 | ||
| Authors | ||
| HODA M. R. M AHMED; ENSHRAH I. M. ELMAAZ; HUSSIEN M. KHALIL | ||
| Soils, Water and Environmental Research Institute, Agricultural Research Center, Giza, Egypt | ||
| Abstract | ||
| Composite surface soil samples were taken from plots (Bahtim permanent experiment) receiving mineral and farmyard (FYM) fertilizer treatments in case of the one-, two- and three-year rotations. These soil samples represent the impact of subjecting such soils for about 100 years to prolonged cropping and fertilization treatments. Soluble, exchangeable, plant-available potassium in conjunction with the potassium intensity of these soils were determined. Moreover, the K-fixation capacity was considered in this study. The obtained data show an obvious decrease in potassium forms in case of the two- and three-year rotation compared with their levels in the one-year rotation. This depends on the crops grown in every rotation. The decrease in K- availability in soils have its impact on crop response to K- applications. This trend should be considered in managing the fertilization programs in the old lands. | ||
| Keywords | ||
| Crop Rotations; Fertilizer; Potassium; Soils | ||
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