ISHS Acta Horticulturae 274: International Symposium on Diagnosis of Nutritional Status of Deciduous Fruit Orchards
LIXIVIATION OF K AND MG OUT OF AN ALLUVIAL SILTY LOAM SOIL UNDER CONDITIONS OF INCREASED OR RESTRICTED WATER SUPPLY |
| Authors: | E. Jadczuk, J. Zmudzin |
| Abstract:
When available soil K content was determined in a long-term potassium fertilizer trial carried out in a sour cherry orchard planted on a silty loam alluvial soil, it was found that, after four years, recovery of K (calculated in relation to the amount of this element applied in fertilizer) reached but 24% in case of plots treated once with 800 kg of K20 per ha and 32% on plots where 200 kg of K20 per ha were applied every year. The question arose in that respect - what was the reason for losses of K - fixation or lixiviation? In order to estimate a possible range of lixiviation under different conditions of water supply, in autumn 1985 an additional trial was established on the same soil, in a field close to the main fertilizer trial. The results obtained indicate that in a loamy alluvial soil, rich with clay minerals, the range of K lixiviation is low even at very high K fertilizer doses and at increased water supply to the soil surface. Hence it is concluded that probably not lixiviation but rather fixation has been responsible for a relatively quick decrease of K present in this soil in available forms. On the other hand, heavy K fertilizer doses together with rainfall may promote lixiviation of Mg contained in that kind of soil. | |
Download Adobe Acrobat Reader (free software to read PDF files) | |
