Impact of sub-soil improvement on soil physical properties and plant growth in the Bangkok plain
1992
Lamsal, Khadananda
Study has been conducted to see the effects of sub-soil improvement on soil physical and chemical properties, irrigation management, and plant growth. Altogether there were 4 treatments for study in which 3 treatments with sub-soil improvement practices such as subsoiling up to 55 cm depth, deep ploughing up to 43 cm depth, and combination of these and 1 treatment with conventional ploughing up to 15 cm depth (control). Significant differences were observed among various treatments of sub-soil improvements on soil properties, irrigation management, & plant growth. Observed experimental data & hydrometrological data during experimentation were used for simulation of ground water contribution, soil moisture content, & irrigation depth & interval through water balancing. The combination treatment has seemed to be best in plant growth, soil permeability, soil aeration, along with lower soil resistance. But slightly faster moisture depletion was realized than others. So, frequent irrigation with smaller depth and smaller ground water contribution are simulated. Almost same with moderate performance in soil parameters were found in deep ploughing and subsoiling treatments. In both cases 6 irrigations for experimental period were simulated, whereas 7 in combination and 5 in control are found. But, slightly better performance of subsoiling than deep ploughing were observed in plant growth. At the same time moisture depletion was lower and ground water contribution was higher in subsoiling than deep ploughing treatment. The lowest performance on plant growth with higher soil resistance were observed in control treatment. Percolation of irrigated water and moisture depletion were reduced, and ground water contribution was higher in control treatment. So, longer interval of irrigation is simulated.
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