Effect of Fertilization on Soil Physical and Chemical Properties Involved DBH Growth of Teak Target Tree

In order to detect the effects of the fertilization on the growth of diameter at breast height (DBH) involved physical and chemical properties of the soil for the 49-year-old Tectona grandis target trees, the L₈(4×2⁴) orthogonal design was applied to implement a comprehensive trial of compound fertilizer (CF), urea, P₂O₅, quicklime and fertilizing methods. Soil physical and chemical properties of the treatment combinations (TCs) were measured at 0-20 (upper layer) and 20-40 (lower layer) cm, which were combined with DBH growth to analyze changes and effects of which. It was found that the pH value, moisture content (MC), bulk density (BD), organic matter (OM), total nitrogen (TN), total phosphorus (TP), total potassium (TK), available nitrogen (AN), available phosphorus (AP) and available potassium (AK) of 0-20 cm layer were 5.01-5.59, 21.5%-26.9%, 1.59-1.71 g/m³, 23.08-32.89 g/kg, 0.123%-0.164%, 0.078%-0.173%, 1.00%-1.33%, 113.5-140.6, 10.63-97.09, 163-453 mg/kg, while which of 0-40 cm layer were 4.91-5.41, 22.5%-29.5%, 1.67-1.79 g/m³, 18.57-23.52 g/kg, 0.097%-0.122%, 0.066%-0.136%, 1.02%-1.59%, 79.8-154.6, 5.9-65.7, 121-657 mg/kg, respectively; the DBH growth percents of the TCs were 4.22%-5.39%, while which of the control (ck) was 3.09%. The OM, TN, AN and AK of the 0-20 cm layer were significantly higher than which of the 20-40 cm layer; the physical and chemical properties of the soil showed complex correlation. The dominant factor affecting DBH growth was the CF. Growth percents of teak DBH presented significantly positive relevant with soil TK involved TN contents of the 20-40 cm layer. Soil fertilization promotes teak growth, and the tending of teak plantation must be paid attention to management of soil nutrients.