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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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

🌿High potassium (38%) for vibrant fruit & vegetable growth

💧100% water soluble for instant nutrient uptake

⚖️Balanced NPK ratio (4-18-38) optimized for tomatoes & veggies

₨14387

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Description

🌱 Grow like a pro—MasterBlend your way to garden greatness!

FLEXIBLE BULK OPTIONS - Available in 1, 5, or 25-pound sizes to fit your garden scale and budget
HYDROPONIC POWERHOUSE - Trusted by commercial growers for consistent, high-yield harvests
PRO RECOMMENDED COMBO - Pairs perfectly with Magnesium Sulfate & Calcium Nitrate for ultimate plant health
SUPER CONCENTRATED FORMULA - Maximize growth with minimal product—effortless mixing and application
COMPLETE MICRONUTRIENT PROFILE - Includes all essential trace minerals to prevent nutrient gaps and crop failure

MasterBlend 4-18-38 Tomato & Vegetable Fertilizer is a premium, water-soluble powder designed for hydroponic and soil gardening. Its high potassium content and balanced nutrient profile deliver proven results for tomatoes, peppers, and other vegetables. Available in multiple bulk sizes, it includes all essential trace minerals and is recommended for use alongside Magnesium Sulfate and Calcium Nitrate to optimize plant health and maximize yields.

Specifications

ASIN	B071HB13XR
Best Sellers Rank	#48,829 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #1,259 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

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

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₨14387

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

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TrustScore 4.5 | 7,300+ reviews

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Excellent communication throughout the order process. Product is perfect.

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