Is there a kit available that contains the master blend, and also the calcium nitrate and magnesium sulfate . sure would be nice .

Yes, sold in amazon and work great. Instructions on the bag and good price.

What the best way to adjust EC if its to low and you already mixed all 3 parts together

First, you should not mix the calcium nitrate together with the master blend and magnesium sulfate (EPSON salts) at the same time. Mix the master blend and EPSON salts together and mix the calcium nitrate separately before adding to your nutrient solution. When you mix all 3 together at the same time it binds up the nutrients and they can’t release properly. See if mixing them separately before adding helps.

Can this fertilizer be applied directly to container plants or must it only be used in a hydroponic system?

Container plants will love this. I top dress soil and water in. I also measure it in filtered water to apply. It's very good stuff.

Newby here, I have an organic container garden, are this supplements synthetic? I purchased this and not sure if I should use it.

Totally synthetic, so now what?

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4-18-38 Tomato & Vegetable Fertilizer - Bulk 1, 5 or 25 Pounds (1 Pound)

4-18-38 Tomato & Vegetable Fertilizer - Bulk 1, 5 or 25 Pounds (1 Pound)

Product ID: 43589230

Details

Brand
MasterBlend
Item Form
Powder
Item Weight
16 ounces
Liquid Volume
16 fluid
Specific Uses For Product
Hydroponic

🌿High NPK ratio 4-18-38 for optimized tomato & veggie growth

💧100% water soluble for instant nutrient delivery

📦Available in bulk: 1, 5, or 25 lbs for scalable gardening

4603 kr

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Sold byAmazon IcelandDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🌱 Grow like a pro, harvest like a boss!

TRUSTED BY PROS - MasterBlend is a world-renowned brand with a 4.6-star rating and proven commercial-grade results.
BULK BUY BULK SAVE - Choose from multiple bulk sizes to match your garden’s scale and avoid frequent reorders.
HYDROPONIC SOIL READY - Versatile use for both hydroponic systems and traditional soil gardens—grow anywhere, anytime.
PRECISION NUTRIENT BOOST - Super concentrated formula ensures your plants get exactly what they need, no waste.
COMPLETE TRACE MINERAL PROFILE - Includes all essential trace minerals for robust, healthy vegetable and tomato plants.

MasterBlend 4-18-38 Tomato & Vegetable Fertilizer is a highly concentrated, 100% water-soluble powder designed for hydroponic and soil gardening. With a powerful NPK ratio tailored for tomatoes and vegetables, it delivers essential nutrients and trace minerals for superior growth. Available in bulk sizes, it’s the trusted choice of commercial gardeners and home growers alike.

Specifications

ASIN	B071HB13XR
Best Sellers Rank	#56,125 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #1,393 in Garden Fertilizers
Brand Name	MasterBlend
Coverage	Medium
Customer Reviews	4.6 4.6 out of 5 stars (472)
Item Form	Powder
Item Weight	16 ounces
Liquid Volume	16 fluid ounces
Manufacturer	MasterBlend
Mixing Ratio	12:6:12
Model Number	MASTERBLEND 4-18-38 (1 POUND)
Number of Items	1
Part Number	MASTERBLEND 4-18-38 (1 POUND)
Specific Uses For Product	Hydroponic
Target Species	tomatoes and vegetables
UPC	600150826019
Unit Count	16 Ounce

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Yes, all products are sourced directly from authorized retailers in the US, UK, UAE and India. We maintain strict quality control processes and verify each product before shipping. All items come with applicable manufacturer warranties and are covered by our standard return policy.

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Desertcart is an international e-commerce platform operating since 2014. We securely process thousands of orders globally each day. Every product goes through our quality verification process before delivery, and we provide end-to-end order tracking, 24/7 customer support, and a comprehensive returns policy to ensure a safe shopping experience.

How is product pricing calculated?+

Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

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TrustScore 4.5 | 7,300+ reviews

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Great price for an authentic product. Fast international shipping too!

3 weeks ago

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The product quality is outstanding. Exactly what I needed for my work.

1 month ago

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4603 kr

Duties & taxes included

In stock

Sold byAmazon IcelandDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Iceland.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

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Perfect platform for hard-to-find items. Delivery was prompt.

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