Development of Slow Release Fertilisers for Pineapple
A compound fertiliser was prepared using different types of straight fertilisers from urea (46% N), China phosphate rock (CPR) (32% P205), muriate of potash (60% K20), gypsum (31 % CaO), kieserite (27% MgO), and copper sulphate (32% CuO). Granualator machine was used in the preparation of granula...
| Main Author: | |
|---|---|
| Format: | Thesis |
| Language: | English English |
| Published: |
1999
|
| Subjects: | |
| Online Access: | http://psasir.upm.edu.my/id/eprint/10431/ http://psasir.upm.edu.my/id/eprint/10431/1/FP_1999_9_A.pdf |
| Summary: | A compound fertiliser was prepared using different types of straight
fertilisers from urea (46% N), China phosphate rock (CPR) (32% P205), muriate of
potash (60% K20), gypsum (31 % CaO), kieserite (27% MgO), and copper sulphate
(32% CuO). Granualator machine was used in the preparation of granular
compound fertilisers. The compound fertiliser showed high percentage of K and N,
16.3 1 and 15.05%, respectively and between 0.091 and 4. 12% for other elements.
The strength of compound fertilisers was measured immediately and after 9 months
of the preparation with the values correspond 3.5 and 0.5 Mpa, respectively. Four types of coating materials were used in the preparation of the slow
release compound fertiliser. With the exception of poly lactic acid (PLA), the
method used for coating of the compound fertiliser with polyacrylamide (PA),
polyvinyl chloride (PVC), and natural rubber (NR) were similar. Differential
scanning calorimetry (DSC) and thermogravimetry analysis (TGA) studies showed
the thermal behavior of the coating materials, and also TGA indicated the
temperature at which the degradation of coating materials may occurr. The
thickness of different coating material was determined by scanmng
electronmicroscope (SEM) and the thickest value was obtained using PVC (3.04
µm). |
|---|