Greenway Biotech, Inc.
Premium Gypsum for Soil Improvement
Premium Gypsum for Soil Improvement
Premium Gypsum for Soil Improvement is a high-quality calcium sulfate gypsum mined from top-grade sources and processed for agriculture. It provides 23% calcium and 18% sulfur to support plant growth, improves soil structure, and reclaims sodic soils without changing pH. 🏆 Since 1989 🧪 Lab Tested 🛡️ 90-Day Guarantee 🚚 Free Shipping $100+ This pH-neutral gypsum adds calcium and sulfur that are water-soluble and plant-available immediately, and can be applied year-round without burning plants. This mineral has been used for centuries to improve soil and crop production.
Designed for diverse soils and crops, it supports drainage and root growth. Typical rates include heavy clay soils 40-80 lbs per 1000 sq ft (1-2 tons/acre) annually; sodic soils 80-160 lbs per 1000 sq ft (2-4 tons/acre) as needed per soil test; compacted soils 40-60 lbs per 1000 sq ft (1-1.5 tons/acre) annually; general maintenance 20-40 lbs per 1000 sq ft every 2-3 years. Tomatoes 1000-1500 lbs per acre pre-plant (prevents blossom end rot); citrus 2-4 tons/acre; peanuts 600-1000 lbs per acre; corn 200-500 lbs per acre; alfalfa 1-2 tons per acre. CDFA registered, organic-compatible, and made in the USA.
📋 Product summary:
- 23% calcium and 18% sulfur
- pH-neutral; does not raise soil pH
- Water-soluble and plant-available immediately
- Flocculates clay to improve drainage and aeration
- Displaces sodium in sodic soils
- Safe for year-round use; no burn
- CDFA registered
- Organic compatible
- Made in USA
| Soil Type | Application Rate | Purpose | Frequency |
|---|---|---|---|
| Heavy Clay Soils | 1-2 tons/acre (40-80 lbs/1000 sq ft) | Improve structure & drainage | Annual or biennial |
| Sodic Soils (High Sodium) | 2-4 tons/acre (80-160 lbs/1000 sq ft) | Sodium displacement | As needed per soil test |
| Compacted Soils | 1-1.5 tons/acre (40-60 lbs/1000 sq ft) | Improve infiltration | Annual |
| General Maintenance | 0.5-1 ton/acre (20-40 lbs/1000 sq ft) | Maintain soil quality | Every 2-3 years |
| Crop Type | Application Rate | Timing | Special Notes |
|---|---|---|---|
| Peanuts | 600-1000 lbs/acre | At pegging | Critical for pod development |
| Alfalfa | 1-2 tons/acre | Pre-plant or early spring | High sulfur demand |
| Corn | 200-500 lbs/acre | Pre-plant | Band or broadcast |
| Tomatoes | 1000-1500 lbs/acre | Pre-plant | Prevents blossom end rot |
| Citrus | 2-4 tons/acre | Spring/Fall | Improves fruit quality |
| Application | Rate | Method |
|---|---|---|
| Lawn (Clay Soil) | 40 lbs/1000 sq ft | Broadcast, water in |
| Vegetable Garden | 2-4 lbs/100 sq ft | Work into top 6 inches |
| Flower Beds | 1-2 lbs/100 sq ft | Top dress or incorporate |
| Potted Plants | 1-2 tbsp/gallon of soil | Mix into potting soil |
| Feature | Gypsum | Calcium Nitrate | Bone Meal | Cal-Mag Plus |
|---|---|---|---|---|
| Calcium Content | 23% | 19% | 24% | 5% |
| Effect on pH | Neutral ✓ | Slightly raises | Neutral | Neutral |
| Organic | Yes ✓ | No (Synthetic) | Yes ✓ | No (Synthetic) |
| Additional Nutrients | 18% Sulfur | 15.5% Nitrogen | 12% Phosphorus | 3% Magnesium |
| Best For | Soil structure, sodic soils | Fast calcium + nitrogen | Organic gardens, phosphorus | Hydroponics, container |
| Breaks Up Clay | Yes ✓ | No | No | No |
| Displaces Sodium | Yes ✓ | No | No | No |
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📦 Nationwide shipping policy & returns
📦 Nationwide shipping policy & returns
NATIONWIDE SHIPPING:
Some free shipping products may be limited to the lower 48 states, as indicated by our shipping estimator tools and checkout cart. Outdoor living, home, and garden items ship nationwide. Standard shipping fees are confirmed at checkout based on your address and provider selection. Free shipping items incur zero fees at checkout. Tracking details are emailed instantly upon order fulfillment.
NATIONWIDE SHIPPING RETURNS: 30 day returns.
We accept returns of unused products that are defective or not defective. Your return must be processed within 30 days of the date of purchase. We do not process exchanges. We will provide a shipping label by email, you are responsible for bringing the return to the shipping provider.
FREIGHT PRODUCT RETURNS: no returns or exchanges.
There are no returns, exchanges or refunds for products delivered via freight. REFUNDS: The cost of the return shipping and a 6% credit card processing/restocking fee will be deducted from your refund amount. The refund balance will be distributed to you once the returned product is received and processed.
NATIONWIDE PRODUCT REFUNDS:
The cost of the return shipping and a 6% credit card processing/restocking fee will be deducted from your refund amount. The refund balance will be distributed to you once the order is canceled and the returned product is received and processed.
Let customers speak for us
Plant was well packed and shipment was very fast. Received a very nice fully rooted plant in the pot!
The organic garden soil is doing very well in my garden bed. The company was professional, nice, and accommodating to my needs. They provide many types of things for your landscaping at a reasonable price.
Product was delivered promptly and the quality of the product was very good, as hoped for. I was thrilled to receive the product so quickly! Thank you!
Product is great. Didn't care for having to pay am extra $17 tariff to UPS to get it delivered, but I guess that's not your doing. Thank you Mr. President.
My new babay arrived safely and only lost two little leaves so far. The first one I ordered from different shop arrived with two leaves attached that fell off within ten minutes of unboxing and 22 leaves that had came off during shipping. So glad she arrived looking as beautiful as i was hoping. Also had a surprise red arrow syngonium cutting that’s beautiful. Also customer service was amazing. Will definitely order from them again. Hoghly recommend this shop.
Great flag and it works well on our hangar ceiling. A little worried it wouldn't arrive in time for our event but it did.
Enjoyed putting them together
I think I’m in love! This beauty came delicately packaged. Seemed to have no stress at all from shipping. I live in Miami, I was worried about shipping all the way from California. To my surprise she arrived well taken care of already. I can tell this grower takes pride in caring for these babies. Shipping was fast. I just ordered again same day!
Great service and great product. Delivery was quick. Good communication.
lovely olive jar, attractive to keep on display. And useful too.
Fast delivery . Product exactly matches description. Easy to contact with same day replies. We will use them again.
Great job from growing to shipping
Quality was excellent. Perfect for my Dad’s grave site, honoring a proud Marine.
Appreciate the extra effort to get the product to me when needed. The delivery was made with speed and consideration, very much appreciated
Very nice slim design. They hold the poles close to the wall and well organized. Very simple install
