Solve your problems

  • Low yields
  • Nutrient deficiencies
  • High nutrient costs
  • Inconsistent results


  • Hourly consultation
  • Nutrient solution design
  • Growing setup optimization
  • Custom crop monitoring automation

HydroBuddy and Blog

Through my blog I also share my insights and experience in hydroponic culture. From how to properly use and calibrate sensors to the peer reviewed effects of nutrient additives I strive to make this blog a reliable source of high quality practical information for both the commercial hydroponic grower and the enthusiast alike. This blog has been ranked as one of the top 50 hydroponic blogs on the internet by feedspot.

Welcome to my site!

I provide nutrient related consultation services for the hydroponic industry. My name is Dr. Daniel Fernandez and I have worked as a consultant for the past 5 years in the hydroponic industry. I have a bachelor’s degree in chemistry and a masters and Ph.D. in nanoscience and nanotechnology. With my experience in nutrient solution chemistry and management I hope to help you take your crops to the next level.

Our services

I provide different types of services to suite your particular needs.

I understand that not everyone needs the same type of assistance and I have therefore designed three specific type of services depending on your needs .

  • An hourly consultation service where you can ask any questions and get answers to help you solve problems (150 USD/hour).
  • A service for the formulation of a specific hydroponic nutrient recipe for your particular needs coupled with guidance in preparing this formulation.
  • An on-going consultation service where you will have me available to answer questions and help guide you through your nutrient needs as your crop or hydroponic project progresses.

Hydrobuddy - Open source software for Nutrient Formulations

This site hosts HydroBuddy – a software I programmed – which is the most popularly used open source calculator for the formulation of hydroponic nutrient solutions and fertilizers. This software has been helping hobby and commercial growers prepare their own fertilizer formulations from 2011 with more than 10 thousands downloads in its lifetime. There are also many peer reviewed academic publications that have used hydrobuddy. Feel free to use or modify this software for your nutrient preparation needs. It’s free and OpenSource! Get the software here.

Latest blog posts

Accurately preparing large quantities of concentrated hydroponic nutrients

When preparing concentrated solutions for hydroponics it is important to have a reproducible process that always generates the exact same results. If this is not done, you’ll obtain different nutrient concentrations between different batches and the concentrated nutrient additions to create the final nutrient solutions will yield inconsistent results. To address the potential variability of […]

Plant Growth Promoting Rhizobacteria (PGPR) in hydroponics

Plants did not evolve in an isolated environment but with a wide variety of different microbes. Through their evolution, plants prospered more in the presence of certain microbes and therefore evolved traits to attract and nurture them. In turn these microbes were also selected to create even deeper mutualistic relationships with plants. Specifically, the bacteria […]

Why do NPK labels express P and K as oxides?

If you have had any contact with the fertilizer world you have probably noticed that fertilizer labels contain N-P-K values on their front and back labels, denoting the chemical composition of nitrogen, phosphorus and potassium available within the product. However you will soon learn that while N is elemental composition – the actual percent of […]

HydroBuddy has now been updated to v1.70: New features and modifications

My free and open source hydroponic nutrient calculator has been available since 2010, going through many iterations and changes through the years. The latest version as of May-24-2020 is now 1.70, which you can download here. This new release implements some important updates and modifications. In this post I will write about these, the reason […]

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