The gap between theory and application
Many agronomists and growers learn fertilization and irrigation through university courses, articles, product manuals, and field experience. The theory is available from many sources.
The challenge is often not finding information, but knowing how to apply it when making real decisions.
How should a soil analysis be interpreted? How should fertilizer rates be adjusted?
How do you prepare stock solutions correctly?
Is the problem nutrition, irrigation, disease, or something else?
How do you make irrigation decisions in real time?
This book was written to bridge the gap between theory and application, helping you turn agronomic knowledge into practical field decisions.
The essential agronomic knowledge – in one book
Most growers and agronomists piece together their knowledge from scattered sources – articles, manuals, and field experience. This book brings the main concepts together and connects them to practical decisions.
Plant nutrition fundamentals
Essential nutrients, their roles and behavior in soil and plant tissue. What deficiencies look like and how to correct them.
Soil analysis & interpretation
How to test your soil, read any soil test report, and understand the properties that drive nutrient availability and crop performance.
Irrigation water quality
Water quality parameters, how to test and interpret a water analysis, and what it means for fertilizer compatibility and system performance.
Fertigation best practices
How to apply fertilizers through irrigation systems – scheduling, compatibility, injection equipment, and common errors that reduce efficiency.
Fertilizer recommendations
A structured approach to building a fertilization program – from crop nutrient demand to application rate calculations across different crop systems.
Hydroponics & nutrient solutions
How to formulate, balance, and adjust nutrient solutions for soilless growing systems – with the chemistry behind the numbers.
Irrigation scheduling
The main methods for deciding when and how much to irrigate – soil-based, weather-based, and plant-based approaches compared and explained.
Nutrient deficiencies & disorders
How to recognize nutrient deficiencies, distinguish them from other stresses, and identify likely causes before taking corrective action.
Sample spreads from inside the book
Written for growers, agronomists, and anyone making fertilization and irrigation decisions
Agronomists & consultants
A reference you’ll return to when advising on complex nutrition and irrigation problems – particularly valuable if your background is stronger in one discipline than the other.
Growers & farm managers
Understand what your agronomist is recommending and why. Make better decisions on fertilization, irrigation scheduling, and soil management based on actual knowledge – not guesswork.
Fertilizer industry professionals
Deepen your technical credibility with growers and distributors. Move beyond product knowledge to the agronomy that makes your recommendations more persuasive.
Agronomy students
Bridge the gap between academic theory and the decisions professionals actually make in the field – with clear explanations grounded in practice, not just textbook principles.
Used by agronomists and growers worldwide
“The concepts are easy to apply. Excellent structure and very relevant examples.”
Jaques D.
Agronomist, Australia
“What a comprehensive guide! I highly recommend it. Well written and technically solid.”
Slobodan Pavlović
Fruit grower, Serbia
“Excellent reference for nutrient and water management.”
Yiek Chun C.
Malaysia
“The book contains many insights I didn’t expect. It helped refine my approach for the upcoming season.”
Andrei D.
Moldova
“This book is an insightful resource. The explanations improved my understanding of several key fertilization and irrigation concepts.”
Mike J.
USA
“I do lawncare and the info in the book is must have. I found the book to be very practical.”
Christo B.
South Africa
Guy Sela
Founder & Lead Agronomist, Cropaia
“The objective of this book is simple: help growers and agronomists make better decisions by understanding the principles behind them.”
Guy Sela is an agronomist with over 25 years of experience in plant nutrition, irrigation, and fertigation systems. He has worked with growers, agronomists, and agricultural companies worldwide – designing nutrient and water management strategies across a wide range of crops and production systems.
He is the founder of Cropaia and yieldsApp, a published author, and a regular speaker at international agricultural conferences. This book distills the most practical aspects of his field experience into a format you can apply immediately.
Common questions
What format is the digital book in?
PDF. Sent by email after purchase. It can be downloaded and read offline on any device. You can also request a print license for one copy.
How long until I receive the book after purchase?
You will receive the PDF by email after purchase – usually within a few hours. If you haven’t received it within 12 hours, check your spam folder or email us at info@cropaia.com. Printed copies are shipped via registered mail – delivery is typically 2-5 weeks depending on destination.
Does it cover my crop type?
The book covers principles that apply across all crops – field crops, orchards, greenhouses, and soilless systems. It uses examples from specific crops throughout, but gives you the foundation to build recommendations for any crop you work with.
What payment methods are accepted?
Credit card and PayPal via the buy button. Alternative options – Western Union, MoneyGram, bank transfer, and country-specific methods – are available via Hotmart (digital) and Hotmart (print). See all payment options here.
What makes this different from free content online?
Most online content explains individual topics. This book connects soil, water, plant nutrition, fertigation, irrigation scheduling, and nutrient management into a single framework.
Is this book also available in other languages?
Yes. The book is also available in Spanish and Portuguese.
Turn fertilization and irrigation knowledge into practical field decisions.
Written by Guy Sela – agronomist and author with 25+ years of experience across diverse crops and production systems.
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