Еffect of the Floor Management Systems on the Content of Potassium in the Soil and Cherry Trees | ВЛИЯНИЕ НА СИСТЕМИТЕ ЗА ПОДДЪРЖАНЕ НА ПОЧВАТА ВЪРХУ СЪДЪРЖАНИЕТО НА КАЛИЙ В ПОЧВАТА И ЧЕРЕШОВИТЕ ДЪРВЕТА
2011
Taseva, V., Institute of Agriculture, Kyustendil (Bulgaria)
The investigation was carried out in an experimental sweet cherry Prunus avium L. plantation, established at the Institute of Agriculture, Kyustendil, on a Chromic Luvisoils LVch. Three floor management systems are studied - permanent fallow and combined with green manure crops and intercrops with rye-pea mixture on the background of two levels of nitrogen fertilization - N10 and N20. It was found that with the application of considerable amounts of phosphorus and potassium 120 kg/da P2O5 and 100 kg/da K2O with the replanting mineral fertilization good reserves of soil in the surface 0-25 cm in treatments of permanent fallow are ensured. The same is true also for the fallow + green manures and fallow + intercrops treatments. In the 25-50 cm soil layer only the variant fallow + intercrops + N20 is well-secured with mobile potassium. In all other treatments reserves are average. The content of potassium was higher in leaves of cherry Bing and Van cultivars, grafted onto mahaleb in a green manure, combined with the N20. The leaves in the fallow + intercrops treatment are less provided with this nutrient.
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