Does anyone know how much to put in per gallon for a Hydroponic setup?

This is for 5 gallons. I have been using this for tomatoes works great. 12 grams of the fertilizer. 12 grams calcium nitrate. 6 grams Epsom salt . You need gram scales. 28 grams in an ounce so not hardly half an ounce

I'm growing tomatoes and peppers in 20 gal. containers, what else do I need to go with this fertilizer?

Calcium nitrate and Epsom salt is all that's needed along with this. If in soil no need for pH down but if you using soiless mediums then just pH down your solution about 1/4 teaspoon to 2mls hope this helps. :)

As side dressing when tomato plant is already producing large tomatoes, how to use? sprinkle on soil or mix in water and pour on soil around root??

Hello, You can use either way. If you would like to use for a liquid application you will need to dissolve 2.5 grams of fertilizer per gallon of water, and then poor onto soil. Depending on the quality of the soil amounts vary, but one gallon of solution should be enough for about 15 to 20 adult tomato plants.

Can you put this straight into the reservoir of wicking tubs?

Hello, You can add it straight to the tubs but we usually recommend dissolving in a bit of water first for easier mixing.

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Greenway Biotech, Inc. Tomato Fertilizer 4-18-38 Powder - Water Soluble with Chelated Micronutrients for Tomatoes Peppers Eggplant - Bigger Fruit Better Flavor - Hydroponics or Soil - 25 LB

Product ID: 38707094

Details

Brand
Greenway Inc.
Item Weight
25.2 Pounds
Item Form
Powder
Liquid Volume
1 Liters
Specific Uses For Product
Hydroponic

🍅4-18-38 NPK for max fruit growth

💧100% water soluble, clog-free

🧪Chelated micronutrients for pH 4-9

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Description

🍅 Grow Bold, Taste Better — The Nightshade Nutrient Revolution

EFFORTLESS APPLICATION - Fully dissolves in water at room temp—perfect for drip irrigation, foliar sprays, hydroponic systems without clogging.
MICRONUTRIENT POWERHOUSE - Includes chelated Iron, Manganese, Zinc, Copper, Boron & Molybdenum to prevent nutrient lockout in soil & hydroponics.
CERTIFIED PURITY SAFETY - CDFA registered and independently tested for heavy metals, ensuring professional-grade quality and peace of mind.
VERSATILE GARDEN ESSENTIAL - One formula supports all nightshade crops from heirloom tomatoes to hot peppers, made in the USA since 1989.
TAILORED NIGHTSHADE NUTRITION - Optimized 4-18-38 formula fuels bigger, tastier tomatoes, peppers & eggplants with high potassium and low nitrogen balance.

Greenway Biotech's Tomato Fertilizer 4-18-38 is a professional-grade, water-soluble powder designed specifically for nightshade crops like tomatoes, peppers, and eggplants. Its high potassium and low nitrogen formula promotes larger fruit with enhanced flavor and shelf life. Enriched with chelated micronutrients, it ensures nutrient availability across a wide pH range, suitable for both soil and hydroponic systems. Independently tested and CDFA registered, this 25 lb bag delivers purity, versatility, and consistent results trusted by growers since 1989.

Specifications

ASIN	B01MZIJ35S
Best Sellers Rank	#98,885 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #2,215 in Garden Fertilizers
Brand	Greenway Biotech, Inc.
Brand Name	Greenway Biotech, Inc.
Coverage	25
Customer Reviews	4.6 out of 5 stars 272 Reviews
Item Form	Powder
Item Weight	25.2 Pounds
Liquid Volume	1 Liters
Manufacturer	Greenway Biotech, Inc.
Mixing Ratio	4:18:38
Specific Uses For Product	Hydroponic,Hydroponics
Target Species	Tomatoes
UPC	018227120944
Unit Count	400.0 Ounce

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