| 摘要 |
A slow-release granular composite fertilizer containing necessary fertilizer elements for a direct seeding method is provided to enable an operator to control and adjust point of time for releasing the granular composite fertilizer. A slow-release granular composite fertilizer containing necessary fertilizer elements for a direct seeding method comprises: 85-95wt% of first fertilizer mixture(11) containing nitrogen, kali, silicon, calcium, magnesium and sulfur; a core fertilizer layer(10) coated with 5-15wt% of resin(12) selected from the group consisting of acryl emulsion resin, latex emulsion resin, bio-degradable wax and urea resin; a second fertilizer mixture(21) containing nitrogen, kali, silicon, calcium, magnesium, sulfur and phosphorus; and an outer fertilizer layer(20) coated with 2-5wt% of resin(22) selected from the group consisting of acryl emulsion resin, latex emulsion resin, bio-degradable wax and urea resin. |
