Effect of Poplar (Populus deltoides Bartr.) Clones on Fertility Improvement in Upland Calcareous Soil after Eleven-Year- Rotation
Das, D. K.
Poplar trees are becoming extremely important as fast growing species due to the increasing need for wood and decreasing productivity of the lands. The present investigation was conducted in eleven-year-old poplar (Populus deltoides Bartr.) plantations established at Krishi Vigyan Kendra, Birouli, Samastipur (Bihar) to find the effect of six promising clones (PP-5, Udai, L-52, L-49, G-48 and L-188) as one of the most important effective factors on soil properties and also to estimate the timber volume of different poplar clones. Clones were planted with 5×4 m spacing in frame of randomized block design with four replications. The soil samples were taken from 0-15 cm and 15-30 cm depth of soils under plantations of different poplar clones and from open (without trees). The results showed that the upper 0-15 cm soil in L-52 poplar clone plot had highest value (6.30 g kg-1 soil) and it was 125% more over control (open). Besides, L-49 had almost similar soil organic carbon status. Hence, the soils under these two plantations have more potentiality for sequestering organic carbon. Irrespective of the soil depths, maximum reduction in pH (0.47 unit) was noticed under the canopy of L-52 followed by L-49 (0.37 unit) and the less change was noticed under L-188 (0.16 unit). Electrical conductivities (EC) under all the poplar plantations were significantly lower as compared to open. Improvement of available macronutrients such as N, P2O5 and K2O, was recorded under all the plantations. Maximum build up was under L-52 followed by L-49 clones. Significant decrease in available S was recorded under Uday, G-48 and L-188, whereas L-52, L-49 and PP-5 poplar clones showed significant increase in available S at both the depths of the soil over open condition. Maximum improvement of available micronutrients Fe, Cu, Mn and B was recorded under L-52 followed by L-49 clones. However, available Zn declined under all the plantations at both the depth of the soil except under the clone L-52 in the surface soil when compared to open. Timber volume (m3ha-1) of the different eleven-year-old poplar clones followed the order: L-52 (271.1) > L-49 (210.0) > PP-5 (184.8) > Uday (176.6) > G-48 (139.0) > L-188 (132.9). Thus, soil fertility as reflected by soil pH, electrical conductivity, bulk density, soil organic carbon, available macronutrients (N, P and K) and micronutrients (Fe, Cu, Mn, B and S) can be improved by integration of L-52, L-49 and PP-5 clones of poplar (Populus deltoides) in silvicultural systems under upland calcareous soil condition, besides meeting the demand of wood for plywood and fuel.
Dr. Rajendra Prasad Central Agricultural University, Pusa (Samastipur)
Soil Sciences
Effect of poplar clones on soil fertility
Size 1.71 MB
M.Sc. Thesis