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Ed Rosenthal - Marijuana Garden Saver: A Field Guide to Identifying and Correcting Cannabis Problems

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Ed Rosenthal Marijuana Garden Saver: A Field Guide to Identifying and Correcting Cannabis Problems
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MARIJUANA
GARDEN
SAVER
Marijuana Garden Saver A Field Guide to Identifying and Diagnosing Canna - photo 1
Marijuana Garden Saver A Field Guide to Identifying and Diagnosing Cannabis - photo 2
Marijuana Garden Saver A Field Guide to Identifying and Diagnosing Cannabis - photo 3
Marijuana Garden Saver A Field Guide to Identifying and Diagnosing Cannabis - photo 4

Marijuana Garden Saver: A Field Guide to Identifying and Diagnosing Cannabis Problems

Copyright 2019 Ed Rosenthal Published by Quick American

A Division of Quick Trading Co. Piedmont, CA, USA

ISBN: 978-1-93680743-7 eISBN: 978-1-936807-44-4

Printed in the United States First Printing

Editor and Project Director: Rolph Blythe

Contributing Editors: Laurie Casebier, Matthew Gates, Joshua Sheets,

Darcy Thompson, Greg Zeman

Art Director: Christian Petke

Design: Scott Idleman/Blink

Cover Design: Scott Idleman, Christian Petke

Cover Photography: Ed Rosenthal

Back cover photo by Lizzy Fritz of Farmhands

Library of Congress Control Number: 2019937100

The material offered in this book is presented as information that should be available to the public. The Publisher does not advocate breaking the law. We urge readers to support secure passage of fair marijuana legislation.

All rights reserved. No part of this book may be used or reproduced in any manner whatsoever without the specific written permission of the Publisher, except in the case of brief quotations embodied in critical articles or reviews.

MARIJUANA
GARDEN
SAVER
A Field Guide to Identifying and Correcting Cannabis Problems

By Ed Rosenthal

Dedicated to Sister Mary Etienne Tibeau, a fine researcher.

ACKNOWLEDGEMENTS

Kristen Angelo (A Pot Farmers Daughter), Rolph Blythe, Arya Campbell, Julia Hass, Scott Idleman, Jane Klein, Fred Morlege, Christian Petke, James Rushing, Marisa Sympson, Darcy Thompson

Nothing is for certain, it could always go wrong.

Come in when its rainin; go out when its gone.

We could have us a high time, living the good life.

High Time

The Grateful Dead

Lyricist: Robert Hunter

INTRODUCTION HOW TO USE THIS BOOK Marijuana Garden Saver gives you the - photo 5
INTRODUCTION HOW TO USE THIS BOOK Marijuana Garden Saver gives you the - photo 6
INTRODUCTION
HOW TO USE THIS BOOK

Marijuana Garden Saver gives you the tools you need to grow healthy marijuana plants. This book is a troubleshooting guide for people who are growing cannabis. It is meant to take you over the bumps and help you solve garden problems. Using the information provided here, you will be able to navigate garden problems and reach harvest with abundant high-quality bud from your garden.

provides information about proper nutrients the plants need and how to identify deficiencies, and includes a guide to pH management.

covers pests that are most attracted to cannabis, their effect on the plant and a variety of preventive and problem-solving techniques.

identifies common diseases that can attack marijuana and how they may be prevented and controlled.

reviews environmental stresses that can impact a garden.

is a guide to the controls referenced in the preceding sections, with suggested commercial brands.

Section 1 NUTRIENTS When plants cannot get the nutrients they need they do - photo 7
Section 1 NUTRIENTS When plants cannot get the nutrients they need they do - photo 8
Section 1
NUTRIENTS

When plants cannot get the nutrients they need they do not function properly, adversely affecting growth and yield. This can occur in any growing medium, while using any planting mix or techniquecoir, rock wool, soil, soilless, hydroponic or aeroponic. Plant disorders are characterized by their symptoms which appear more quickly in hydroponic gardens than in planting mixes or soil.

An over-abundance of nutrients can result in nutrient burn or toxicity and can also lock out other ingredients. Unless the damage is slight, individual leaves do not recover from nutrient deficiencies. Some nutrients are mobile and are translocated from older to new growth so the damage is seen in older leaves, not in new growth. Other nutrients are not mobile. Their deficiencies are apparent in the new growth.

All fertilizer packages list three numbers that identify the N-P-K ratio. They usually appear as three numbers with dashes between them such as 25-10-10. The first number represents Nitrogen (N), which is responsible for foliage or leaf development. Fertilizers that promote heavy leaf growth have a higher first number (N) than the other two. The second number represents Phosphorus (P), which is important for strong stems and flowering. The third number is Potassium (K), which promotes healthy metabolic function. Sometimes micronutrients are listed after the macronutrients: these are Calcium (Ca), Copper (Cu), Manganese (Mn), and Zinc (Zn).

All nutrients are required to be present for proper metabolic function. Most growers use premixed nutrient systems and faithfully follow the manufacturers feed schedules never see deficiencies before they flush their plants. Two deficiencies that may appear when using commercial fertilizers are Calcium (Ca) and Magnesium (Mg). On the other hand, organic, living soil and outdoor plants that do not receive supplemental nutrition are more often subject to deficiencies, but only because living soil systems have more variables involved in delivering nutrients compared to concentrated nutrient products.

pH

pH is a logarithmic measure of the acid-alkaline balance in soil or water. A pH of 1 is the most acidic solution, 7 is neutral and 14 is the most alkaline. When the pH is within the 5.8-6.3 range, slightly acid, the nutrients dissolve well and are available to the plants. As the pH rises above or falls below those numbers some nutrients precipitate out of solution. Plants cannot absorb nutrients when they are precipitated. Plants can only drink them when they are in solution so even if nutrients are present, they are only available to the plants only when they are dissolved. As a result, even though sufficient nutrients may be present, plant roots do not have access to them so and the plants will indicate deficiencies. Plants that are growing in water or soil outside the proper pH range grow very slowly.

Different species of plants have adapted to living under different pH levels. Marijuana has been grown in hydroponic solutions with a pH as low as 5.5, but it does best when grown in soil or water within a pH range of 5.6-6.3, slightly acidic. This is the pH of good garden soils. All plant nutrients are water soluble in this range so they are readily available to the plants. Outside this range some become less available.

pH can be viewed as a see-saw. As fertilizers are added it can drop or rise rapidly. Its up to the grower to keep it the pH stable. It is important to measure pH after adding nutrients. When pH levels are out of the safe range nutrients fall out of solution and are unavailable to the plants. pH is important for both soil and hydroponic gardening. Failing to monitor it can lead to disastrous results. The pH level directly affects plants ability to absorb nutrients. When the pH rises above 6.2 some micronutrients precipitate out of solution and are less available. Below 5.5 Boron (B), Copper (Cu), Manganese (Mn), and Phosphorous (P) become too available. This can result in toxicity.

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