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?

Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

Help Track order

Account Cart

Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

Help Track order

Account Cart

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

MasterBlend 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

⚡Super concentrated formula boosts growth efficiency

🌿Balanced 4-18-38 NPK ratio optimized for tomatoes & veggies

💧100% water soluble for instant nutrient delivery

₨14234

Duties & taxes included

In stock

Sold byAmazon Sri LankaDelivered 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 Sri Lanka.

Secure transaction

Description

🌱 Grow like a pro—unlock your garden’s full potential with MasterBlend!

EASY MIX USE - Dissolves instantly for hassle-free feeding in soil or hydroponics
HYDROPONIC HERO - Trusted by commercial growers for consistent, high-yield results
PRO GROWTH FORMULA - Pairs perfectly with Magnesium Sulfate & Calcium Nitrate for ultimate balance
CUSTOMIZABLE BULK OPTIONS - Available in 1, 5, or 25-pound sizes to fit your garden scale
COMPLETE NUTRIENT SPECTRUM - Includes all essential trace minerals for vibrant plant health

MasterBlend 4-18-38 Tomato & Vegetable Fertilizer is a premium, water-soluble powder designed for hydroponic and soil gardens. Its super concentrated formula delivers a precise NPK ratio optimized for tomatoes and vegetables, enriched with essential trace minerals. Available in bulk sizes, it’s the go-to choice for commercial and home growers seeking reliable, high-yield results.

Specifications

ASIN	B071HB13XR
Best Sellers Rank	#36,737 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #1,028 in Garden Fertilizers
Brand Name	MasterBlend
Coverage	Medium
Customer Reviews	4.6 4.6 out of 5 stars (471)
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

Common Questions

Are the products genuine and authentic?+

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.

How long does delivery take and is it reliable?+

Delivery times vary by destination country, typically ranging from 3-9 business days. Each order is fully trackable through our system. We handle all customs clearance and use reliable courier partners for last-mile delivery. You'll receive regular updates about your order status via email and our app.

What is Desertcart? Is it safe to order from?+

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.

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Yusuf A.

Fantastic experience overall. Will recommend to friends and family.

1 month ago

Suresh K.

Very impressed with the quality and fast delivery. Will shop here again.

4 days ago

View all Trustpilot reviews

Shop Global, Save with Desertcart

Value for Money

Competitive prices on a vast range of products

Shop Globally

Serving millions of shoppers across more than 100 countries

Enhanced Protection

Trusted payment options loved by worldwide shoppers

Customer Assurance

Trusted payment options loved by worldwide shoppers.

Desertcart App

Shop on the go, anytime, anywhere.

₨14234

Duties & taxes included

In stock

Sold byAmazon Sri LankaDelivered 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 Sri Lanka.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Ayesha M.

The product exactly matches the description. Very satisfied with my purchase.

5 days ago

Imran F.

Very reliable shop with genuine products. Will definitely buy again!

2 weeks ago

View all Trustpilot reviews