Effect of 45-year Mineral Fertilization on the Nutrient Properties of Rendzic Leptosols and the Productivity of Oriental Tobacco | Влияние на 45-годишното минерално торене върху хранителния режим на Хумусно-карбонатна почва и продуктивността на ориенталски тютюн
2014
Bozhinova, R., Institute of Tobacco and Tobacco Products, Plovdiv (Bulgaria)
The effects of 45-year mineral fertilization with different nitrogen, phosphorus and potassium rates on selected soil properties pH, total humus, total and mineral nitrogen, available potassium, phosphorus, calcium and magnesium content, yield and quality of oriental tobacco were studied in a stationary field trial. A long-term fertilizer experiment with continuous tobacco cropping system was established at Tobacco and Tobacco Products Institute – Plovdiv on Rendzic Leptosols in 1966. It was found that soil pH slightly decreased in the mineral-fertilized and non-fertilized plots. Mine-ral fertilizer application and lack of fertilizer application led to a soil organic matter decrease. The application of 75 kg P2O5 ha-1y-1 significantly increased the soil available phosphorus concentration. Continuous fertilization with 75 kg K2O ha-1 resulted in a available K2O increase by 29.6 – 57.3% as compared to the initial value. Long-term monoculture growing of oriental tobacco on rendzina soils Rendzic Leptosols results in good I-st grade dry tobacco to yield ratio, when N50P75K75 are applied annually.
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