Soil Conditions for Mineral Nutrition of Oriental Tobacco Krumovgrad | Почвени условия за минерално хранене на ориенталски тютюн Крумовград
2010
Yancheva, D., Agricultural Experimental Station, Kardzhali (Bulgaria)
The dynamics of the basic nutrient in the soil is investigated during different phases of the vegetation of oriental tobacco Krumovgrad. The results obtained will contribute to the characterization of the soil conditions of areas under tobacco in the Eastern Rhodope mountains as regards the mineral nutrition in connection with the optimization of its nutritive regime and preservation of soil fertility. Established are the levels of the mobile forms of nitrogen, phosphorus, potassium, magnesium and calcium in the 0-30 soil layer. Immediately before transplanting at the beginning of May the content of the hydrolysable nitrogen is within the range of 8.00 - 9.5 mg/1000 g soil; that of phosphorus is 10.00-11.23 mg/100 g; of calcium 144.2-161.2 mg/100 g. About 40 days after transplantation at the end of June the hydrolysable nitrogen reaches values within the range of 16.54-38.62 mg per 1000 g soil, phosphorus 12.67-16.82 mg/100 g; potassium 12.45-15.43 mg/100 g. At the end of the vegetation period in September, the content of the hydrolysable nitrogen decreasesand varies between 3.00-5.50 mg/1000; the content of phosphorus increases up to 15.82-19.92 mg/100 g; of potassium 12.71-15.45 mg/100 g; of magnesium 22.64-27.17 mg/100 g; of calcium 149.3-166.8 mg/100 g.
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