Tan Cuong, Thai Nguyen where is tea cultivated upland areas has three popularly intensive levels: high (26 percent), moderate (56 percent) and low (18 percent), respectively. Results show that basic properties of researched soils are quite favorable for the growth and development of tea. Soils have acidic reaction with pH/KCl from 3.75 to 4.15
soil texture which is silt loam
moderate moisture (16,63 - 24,37 percent)
bulk density (1.13 - 1.49 g/cm3). Soil organic matter increase from 2.76 percent to 4.13 percent and are classified between moderate and rich degree. The content of total nitrogen, phosphorus, potassium increase with the rised levels of intensiveness, the former jumping from 0.19 to 0.29 percent, the latter rising between 0.11 percent and 0.16 percent and the last going up from 0.21 to 0.45 percent. The available nitrogen content fluctuate from 4.29 to 9.26 mg/100g soil. The available phosphorus content fluctuate from 3.84 to 5.08 mg/100g soil and the available potassium content climb from 5.37 mg/100g to 8.25 mg/100g. The cation exchanged capacity fluctuate from 18.2 to 21.6 m.e/100g. The concentration of exchanged aluminum fluctuate from 6.9 me/100g to 9.6 me/100g. That of exchanged calcium fluctuate from 2.1 m.e/100g to 5.3 m.e/100g and the concentration of magnesium from 3.4 to 7.2 m.e/100g. The economic efficiency of tea cultivation reachs a peak of 18.8 tons/ha/year in high intensive group and hit a lowest of 14.4 tons/ha/year in low intensive one. Nevertheless, the invested efficiency has opposed trend, which has the highest point of 3.08 in low intensive group and the lowest of 1.61 in high intensive one.