| Author | Lim, Seng Liam |
| Call Number | AIT Thesis no.AE-84-04 |
| Subject(s) | Liming of soils
|
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Science, School of Environment, Resources & Development |
| Publisher | Asian Institute of Technology |
| Abstract | The effects of liming, water hyacinth compost, rice straw, phosphorus and incubation lime on nitrogen mineralization were studied in cropped (ph 3.57) and uncropped (ph 7.08) soil at 30 ํc.
Under aerobic incubation, total mineralised n content for both soils increased with increasing application of lime and compost. For uncropped soil at pH 6.50, total mineralised N content increased from 0.39 to 1.51 mg/100 g soil within 12 weeks incubation, whereas, with lime and compost, it increased from 1.85 to 5.02 mg/100 g soil. But addition of rice straw tended to slow down the mineralisation. At pH 3.75 mineralised N accumulated mainly as NB4.
During anaerobic incubation, nitrification almost ceased within 2 weeks and NR4 content rapidly increased. For cropped soil at pH 8.50 with added compost, No3-N content decreased from 1.04 to 0.41, whereas, NH4-N rapidly increased from 0.60 to 8.15 mg/100 g soil within 9 weeks. Rice straw resulted in a low content of mineralised N. Added phosphorus seemed to have little or no effect on N mineratlisation.
The Neubauer test for available nitrogen showed that 17 days old rice plants had effectively taken up N from the soil to which lime and compost had been added. |
| Year | 1984 |
| Type | Thesis |
| School | School of Environment, Resources, and Development |
| Department | Department of Food, Agriculture and Natural Resources (Former title: Department of Food Agriculture, and BioResources (DFAB)) |
| Chairperson(s) | Eppendorfer, W.H. |
| Examination Committee(s) | Jensen, Jens Raunso ; Wee, Kok Leong
|
| Scholarship Donor(s) | Government of Australia |
| Degree | Thesis (M.Sc.) - Asian Institute of Technology, 1984 |