Fertilizer by crop
The Silicon Techs rice programme, timed by crop age. Tested on very acidic paddy (pH 4.6) around Songkhla Lake, it gave 22.9% more yield than standard fertilizer.
Coloured bars show when to apply at each stage. The current month is highlighted.
Land preparation · Jun – Jul
Correct acidity, release locked-up nutrients and give roots a fast start.
Recommended
Rate & method: Broadcast Orthosilicic Acid+ Gold powder at 50 kg/rai during normal ploughing.
Or choose
Orthosilicic Acid (H4SiO4), Powder & GranuleMa Ngao brand
Mor Kaset Plus 6-6-6 + OM 10%Sam Ma Ngao brandNo extra ploughing needed — spread it during the ploughing you already do.
Day 25–30 · Jul – Aug
Push tillering with sturdy stems and upright leaves that won’t lodge.
Recommended
Rate & method: 16-8-8 mixed 1:1 with Mor Rice, 25 kg/rai in total.
Or choose
Chemical Fertilizer 16-20-0Ma Ngao brand
Chemical Fertilizer 25-7-7Ma Ngao brand
Mor Kaset Plus 12-3-5 + OM 10%Sam Ma Ngao brandIf you stay with 16-20-0, mix in Mor Rice according to soil pH (see the table below).
Day 60–65 · Aug – Sep
Long panicles with more grains per panicle through the critical stage.
Recommended
Rate & method: 15-7-18 mixed 1:1 with Mor Rice, 25 kg/rai in total.
Or choose
Keep the water level steady at this stage.
Around day 90 · Sep – Oct
Full, heavy grains with fewer empty ones — fewer price deductions.
Recommended
Rate & method: 15-7-18 mixed 1:1 with Mor Rice, 20 kg/rai in total.
Or choose
For short-duration rice (90–100 days), bring this round forward to the booting stage.
Add every time you fertilize
Mix Mor Rice with NPK by soil pH: very acidic (below 5) 1:1 · moderately acidic (5.0–5.5) 2:1 · normal (5.5–6.5) 3:1 or 4:1 (NPK : Mor Rice). On alkaline soil, add 10–30% as a supplement.
Keep your 16-20-0 and urea but replace part of it with Mor Rice according to soil pH. Fertilizer cost per rai always goes down; at 1:1 the trial plot yielded 18% more.
Prepare the soil with Orthosilicic Acid+ Gold, then fertilize in three rounds by crop age. The trial plot yielded 22.9% more with higher net profit than NPK alone.
On very acidic paddy, mix Mor Rice 1:1 to halve your NPK — saving about 269 baht/rai versus the usual 45 kg/rai.
Rates on this page are general guidance for bearing trees. Adjust for tree age, canopy size, crop load and soil test results. Months are approximate and vary by region.
Source: Silicon Techs rice programme, Mor Rice guide and trial report (2026)
Not sure? Ask a local dealer — our team will visit your farm.
Tell us your crop, tree age and the problems you see — our agronomists will plan it with you for free.
