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What Is Agricultural Gypsum Powder? (زرعی جپسم پاؤڈر کیا ہے؟)
Meaning of Agricultural Gypsum Powder in Urdu is “زرعی جپسم پاؤڈر” کیلشیم سلفیٹ پر مشتمل پسا ہوا معدنی پتھر، جو سخت اور کلر والی مٹی کو نرم کرنے اور پودوں کو کیلشیم اور سلفر دینے کے کام آتا ہے. If water sits on your soil, the surface cracks into a hard crust, or white salt patches keep coming back, this is the mineral gardeners and farmers reach for first.
It is a dry mineral powder made by grinding mined gypsum rock. It is unlike limestone in one important way: it dissolves more readily in water, so it releases calcium and sulphate faster, and it does not push pH up. It is also not plaster of Paris or wall putty, which set hard when wet and must never go on soil.
At a Glance
| Question | Answer |
|---|---|
| What is it? | Gypsum, CaSO₄·2H₂O (calcium sulphate dihydrate). A soil conditioner, not a fertiliser. |
| Product type | Neutral calcium-sulphur soil conditioner |
| Grade | Typical for gypsum: about 19–23% calcium and 15–19% sulphur. High purity agricultural grade (90-95%), finely ground (80-100 mesh). |
| What does it do? | Helps loosen heavy clay, improves water penetration, supplies calcium and sulphur, and helps replace sodium in sodic soil. |
| Does it change pH? | Pure gypsum does not. Unlike limestone, it generally does not affect soil pH, though some natural sources contain a little dolomite or lime that can raise pH slightly. |
| How much? | Starting points: about 100 g per m² in beds and lawns. Farm rates depend on a soil test. |
| How fast? | Faster than limestone, but still gradual – typically weeks to a season. |
| What is it not for? | Not a fertiliser, pH adjuster, pest control, or anything to eat. Not a cure for every salty soil. |
Which Soil Problem Are You Trying to Fix? (آپ کا مسئلہ کیا ہے؟)
Gypsum is often bought for the wrong problem. Use this quick check first.
| Your situation | Is gypsum the answer? |
|---|---|
| Hard, sticky clay that crusts when dry and floods when wet | Yes – it helps clay particles clump so water and air move better. |
| A test shows high sodium (sodic soil) | Yes – calcium replaces sodium, which then needs to be washed away with good irrigation and drainage. |
| White salt crust but the test shows low sodium | Not on its own. Other salts need drainage and leaching, not calcium. |
| Soil is acidic and needs its pH raised | No. Use a liming product instead. |
| Soil is alkaline and you want pH lowered | No. Gypsum does not lower pH like sulphur-type products do. |
| Plants need calcium but pH is already right | Yes – a calcium source that leaves pH alone. |
Heavy clay, crusted surfaces and salt-affected patches are common problems in parts of Pakistan, especially where irrigation water is hard or evaporation is high. A soil test that reports sodium, salinity and pH together tells you which of these you really have, and an agriculture university or provincial soil lab can run it.
Looking for gypsum near me? Order online from Organic Baghbani and see related products in our Soil pH Adjusters & Conditioners category.
What Can It Do for Your Plants? (پودوں کو کیا فائدہ ہو سکتا ہے؟)
- Can supply calcium and sulphur without changing pH, so it suits soil whose pH is already right.
- Can help loosen clay and reduce surface crusting, which lets roots go deeper.
- Can improve water penetration and aeration, so less water runs off.
- Can help reclaim sodic soil by replacing sodium with calcium.
- Can reduce aluminium and boron toxicity in acidic soils, although it will not raise their pH.
- May support tomatoes and peppers where low calcium is part of the problem; steady watering matters just as much.
What it will not do
- It will not feed plants with nitrogen, phosphorus or potassium.
- It will not raise pH (use a liming product) or lower pH (use a sulphur-type product).
- It will not act as a pesticide or fungicide.
- It will not wash salt out of the soil by itself; that needs drainage and enough clean water.
Results depend on your soil, your plants and your watering.
How Much Should You Use? (کتنا ڈالیں؟)
These are conservative starting points for home gardens. Farm-scale and sodic-soil rates are set by a soil test, so message us on WhatsApp with your test report. A level teaspoon of fine powder is roughly 4–5 g, but a kitchen scale is better.
| Situation | Starting amount | Notes |
|---|---|---|
| Heavy clay vegetable or flower bed | About 100 g per m² | Scatter, then work into the top 10–15 cm and water in. Retest before repeating. |
| Lawn (لان) with hard, compacted soil | About 50–100 g per m² | Scatter evenly, brush in, water well. |
| Fruit trees (پھلدار درخت) | About 100 g per m² under the canopy | Fork in lightly; keep it off the trunk. |
| Pots and potting mix (گملے کی مٹی) | About 1 g per litre, roughly a quarter level teaspoon | Only if you want extra calcium and pH is already right. |
| Sodic or salty field | Test-based | Rates run far higher; send your lab report for advice. |
| Seeds and seedlings | None directly | Work it into the bed beforehand. |
Apply once per season at first, and retest before adding more.
How Does It Compare with Other Options? (دوسرے انتخابات سے فرق)
| Option | Main job | Changes pH? | Choose it when |
|---|---|---|---|
| Gypsum (this product) | Calcium and sulphur, structure, sodium | No | Heavy clay, sodic soil, or calcium needed at the right pH. |
| Limestone, calcium carbonate or dolomite | Raise pH of acidic soil | Raises it | Soil is acidic. |
| Sulphur-type products | Lower pH | Lowers it | Soil is alkaline and pH must come down. |
| Epsom salt (magnesium sulphate) | Fast magnesium and sulphate | No | A quick magnesium top-up is needed. |
| Organic compost | Organic matter, slow nutrition | Not a pH corrector | You also want soil structure to improve over seasons. |
| Rice husk | Aeration and mulch | No | Heavy soil needs physical opening up; it breaks down slowly. |
For more choices, browse the For Alkaline Soils range.
| Pack Size | Effective Rate | Pack Price | Select |
|---|---|---|---|
1kg | ₨ 150 / KG | ₨ 150 | |
5kg | ₨ 90 / KG | ₨ 450 | |
10kg | ₨ 70 / KG | ₨ 700 | |
25kg | ₨ 68 / KG | ₨ 1,700 |
How Does It Work in the Soil? (مٹی میں یہ کیسے کام کرتا ہے؟)
According to Wikipedia’s gypsum article, gypsum is moderately water-soluble, at roughly 2.0–2.5 g per litre, and as a fertiliser it supplies two secondary plant nutrients, calcium and sulphur, and unlike limestone it generally does not affect soil pH. The same article describes how adding it to sodic soil reduces the exchangeable sodium percentage, and notes that it improves soil structure, water absorption and aeration. In simple terms, calcium from gypsum takes the place of sodium on clay particles, the particles clump together, and the freed sodium can then be washed down with irrigation water, provided the field drains.
How Do You Apply It Safely? (محفوظ استعمال کا طریقہ)
- Know your problem first. Test for pH, sodium and salinity if you can.
- Weigh the dose from the table above, ideally on a kitchen scale.
- Protect yourself. Calcium sulphate is not toxic, but powdered gypsum can irritate skin and airways, and safety bodies set limits for airborne dust (US NIOSH pocket guide). Wear gloves, a dust mask and eye protection, and apply on a still day.
- Spread evenly over the soil, work it into the top 10–15 cm, then water in well.
- Irrigate and drain. For sodic soil, follow with enough clean water and good drainage so the sodium can wash out.
- Wait 2–3 weeks before sowing or transplanting where you can. For pots, mix in ahead of time.
- Recheck after a season and repeat only if the test still shows a need.
- Store sealed, cool and dry, out of reach of children and pets. For soil use only, never for eating.
Product Specifications
| Specification | Details |
|---|---|
| Product | Gypsum (calcium sulphate dihydrate) |
| Brand | Organic Baghbani |
| Form | Dry powder |
| Calcium content | Typically about 19–23% (general value, not a test of each batch) |
| Sulphur content | Typically about 15–19% (general value, not a test of each batch) |
| Water solubility | Moderately soluble, roughly 2 g per litre |
| Effect on pH | None for pure gypsum |
| Purity | ~90-95% Calcium Sulphate Dihydrate (CaSO₄·2H₂O) |
| Particle size | 80 – 100 mesh (Fine powder for rapid soil penetration) |
| Appearance | Off-white to light gray powder (ہلکا سفید یا سرمئی پاؤڈر) |
| Additives | None (100% natural mined mineral) |
| Origin and source | Pakistan (Salt Range / Kohat regions) |
| Packaging and pack sizes | 1KG, 5KG, 10KG, 25KG |
| Claim | Soil conditioner that supplies calcium and sulphur without changing pH |
| Primary use | Improving heavy clay, correcting sodic soil, supplying calcium and sulphur |
| Suitable for | Vegetables, lawns, fruit trees and field crops growing in clay or sodic soil |
| Not ideal for | Raising or lowering pH; pest or disease control; building plaster or casting; eating |
| Category | Soil pH Adjusters & Conditioners › For Alkaline Soils |
| Bulk orders | Special discount – WhatsApp or call 03119073909 |
Does gypsum change soil pH? (کیا یہ pH بدلتا ہے؟)
Generally no. Unlike limestone, gypsum supplies calcium and sulphur without noticeably raising pH, and it does not lower pH like sulphur products do. That is why it suits soil whose pH is already acceptable.
Gypsum, lime or sulphur: which one do I need?
Lime raises the pH of acidic soil, sulphur-type products lower the pH of alkaline soil, and gypsum is for structure, sodium and calcium where pH is fine. A soil test that includes pH and sodium settles it.
Will it fix my salty (کلر) soil?
It works on sodic soil, where sodium is the problem, by replacing sodium with calcium. Soil that is salty for other reasons needs drainage and leaching instead, so test before you buy.
How long does it take to work?
It dissolves faster than limestone, but soil change is still gradual. Expect weeks to a season, faster on well-watered, well-drained soil.
How much do I use?
For home beds and lawns, start around 100 g per m² and retest. Farm-scale and sodic-soil rates depend on a test, so share your report on WhatsApp (https://wa.me/923119073909) for advice.
Can I use it in pots? (گملوں میں؟)
Only in small amounts, roughly 1 g per litre, and only if you want calcium and your mix pH is already right. Heavy doses add salts and can stress roots.
Will it stop blossom end rot in tomatoes and peppers?
Not on its own. Low calcium is one cause and uneven watering is another, so gypsum helps mainly where soil is genuinely short of calcium. Mix it in weeks before planting and keep watering steady.
Gypsum or Epsom salt?
Gypsum gives calcium and sulphate and improves structure; Epsom salt gives magnesium and sulphate and acts fast. Choose by what your soil lacks, not by habit.
Is it the same as plaster of Paris or wall putty?
No. Plaster of Paris is gypsum that has been heated and sets hard when wet, so it must never go into soil. This product is for soil use only, not for building or casting.
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