Agrochemical characterization of podzolic-yellow soils fertilized for a long time

It is known from our research that in the last 40-50 years, as a result of intensive use of podzol-yellow soils, the reserve and amount of humus reduced, mechanical composition relatively lightened, but relatively stabilization was observed in humus quantity in the areas where the crop rotation was available. It is known that among the agricultural plants, the standard soil for tea plant - weakly podzolic yellow soil has a score of 100 points on the quality scale. Every year application of mineral fertilizers is required in order to get a lot of green leaf crops from the tea plant bushes in terms of soil-ecological requirements. Therefore, physiological acid ammonium-sulfate fertilizer is applied to bushes at a high dose every year. The super-phosphate fertilizer with more gazh in its composition is applied together with nitrogen fertilizer in order to increase its efficiency. In addition to it, potassium-chlorine or potassium-sulfate is applied. According to the research results it can be noted that humus of moderately washed sort decreased 0,1-1,30%, total nitrogen - 0,07-0,08%, absorbed ammoniac - 20,60-40,14 mg/kg, ammoniac dissolved in water - 1,56-4,38 mg/kg, nitrate - 0,24-2,34 mg/kg, total phosphorus - 0,04-0,05%, gross phosphorus - 2,28-23,54 mg/kg, total potassium - 0,14-0,80 %, exchangeable potassium - 50,0-77,4 mg/kg compared to non-degraded sort.