June 20, 2008
Misconceptions With Controlled Release Fertilizers
Pilon: How do rates vary between incorporation and topdressing? Passchier: There are two factors involved when speaking about incorporation and topdressing the fertilizer. The first is the potential differences in nutrient availability for the plant when incorporating versus topdressing. The second is the amount of fertilizer that is used when incorporated compared to the topdressing rate. Let’s remember that CRF fertilizers are released by temperature and research shows that different technologies are affected by the temperature changes around the CRF prill that can alter their expected release. Just think about the temperature fluctuations and moisture consistency in the media versus the temperature fluctuation and moisture consistency on top of the media. In general, there is likely to be less temperature fluctuation and more moisture consistency in the pot than on the surface of the pot. The surface of the media is subject to greater temperature changes between night to day […]
June 19, 2008
Q&A On Controlled-Release
Pilon: What are the methods controlled-release fertilizers (CRF) are applied? Passchier: The two most common methods of applying controlled-release fertilizers in greenhouses and nurseries is to incorporate them into growing mixes prior to planting (incorporation) or placing the fertilizer on top of the potting substrate (topdressing). Topdressing entails placing a predetermined amount of fertilizer on top of the growing medium of each container. Generally, topdressing is reserved for second-season crops, but there are some growers who topdress crops just after planting new liners. Care should be taken with this practice to make sure you have a first-season fertilizer and not a second-season topdress fertilizer. The first method I was exposed to 15 years ago was the "big hand" method. The grower/owner would show the hired help how much fertilizer to put in their hands and then place it on the surface of the container. Needless to say, the size of […]
June 18, 2008
Misconceptions About Controlled—Release Fertilizers
Delivering and managing nutrition is one of the primary tasks associated with producing greenhouse crops. Most growers deliver nutrients using various water-soluble fertilizers, some growers use controlled-release fertilizers (CRF), while others use a combination of controlled-release and water-soluble fertilizers. As I travel across the country to visit various growers, I’ve come to recognize that many growers would like to consider using controlled-release fertilizers at their facilities but do not understand these products well enough to implement them into their production systems. With a shift in irrigation and fertility practices, where growers must control leaching and water runoff from their production sites, the use of controlled release fertilizers will allow growers to produce high-quality crops and manage the nutrients that leave their production sites more effectively. From my perspective, there is a great need to educate growers of the benefits and risks associated with the use of controlled release technology. To help […]
June 18, 2008
What’s In Controlled-Release?
In the first installment of this four-part series, we began to introduce several important aspects regarding controlled release fertilizers (CRFs). Slow-release fertilizers are reacted urea formaldehyde products. Each has its own characteristic chain of polymers, which are gradually broken off by microbial activity and then made available for roots to uptake. Controlled-release fertilizers are fertilizers with nutrients that are encapsulated or coated, similar to an M&M candy, where there is an outer candy coating and the good stuff inside the coating. Fertilizer is released when moisture is drawn into the covered coated prill and turns the fertilizer salt into a semi-soluble form. The release of nutrients from the prill varies slightly with the technology used to formulate the coating. All CRFs typically have either a resin or polymer coating. The main difference is how the water soluble fertilizer comes out of the prill. The rate of release is often a function […]
June 18, 2008
Pilon: How does temperature affect release? Passchier: As we discussed previously (see the July 2007 issue), controlled release fertilizers can be compared to M&M candy since the good stuff is inside of the coating of each of these products. As the temperature increases so does the solubility of the candy and fertilizer on the inside. The main difference is the inside of the coated prill of the fertilizer contains some form of salt. Moisture needs to be present around the coated fertilizer prill in order for moisture to be drawn inside allowing the solid fertilizer salt to turn into a semi-soluble state. As the temperature increases, so does the solubility and the pressure inside the prill. Consequently, with higher temperatures and increased internal pressure, it requires less time for the fertilizer to come out of the prill and be available for plant uptake. The trick to formulating and using CRFs […]
April 28, 2017
Growers Developing Strategies for Better Plant Growth R…
Whether it’s through new liner programs or more consistent grouping of plants, growers continue to find ways to effectively manage their plant growth regulator programs.
April 27, 2017
Hoffman Nursery Cheers On the Next Generation of Hortic…
Hoffman Nursery was a sponsor of the recent 41st National Collegiate Landscape Competition, an event that offers several opportunities for companies in the green industry to meet and recruit the next-generation of horticulturists.
April 26, 2017
Monitor Potential for Heat Stress in Your Geraniums
Heat stress, which can originate from a lack of air flow around baskets suspended in high areas, causes foliar bleaching and chlorosis of zonal geraniums.
April 25, 2017
Kelly Norris: Diversity is the Key to Growing the Ornam…
Offering a selection of ornamental grasses that cater to customer needs will keep sales from stagnating.
April 25, 2017
Out-Of-This-World Plant Nutrition: Fertilizer Company I…
NASA scientists are growing vegetables on the International Space Station using Florikan’s controlled release fertilizer.
April 25, 2017
41 New Vegetative Petunias From California Spring Trial…
With the abundance of new introductions for the 2018 retail season, we’ve made it easier for you to sift through them by separating out the vegetative petunias from the Northern sites, which includes selections from Westhoff Flowers, Sakata Ornamentals, Danziger, Proven Winners, and Syngenta flowers.
April 24, 2017
Ian Baldwin Offers Examples From Grower-Retailers on Pr…
In March, Baldwin wrote a blog advising grower-retailers to consider raising their prices this spring. The post inspired a number of creative suggestions.
April 22, 2017
American Floral Endowment Announces Winners of 2017 Pau…
Four students pursuing careers in horticulture now have scholarships to help them along the way, thanks to the American Floral Endowment.
April 20, 2017
Terra Nova Nurseries Releases Two New, Attractive Begon…
Stardust is the latest addition to Terra Nova Nurseries’ existing T Rex Begonia series, and Silver is the first introduction to the company’s new Spectre Begonia series.
April 19, 2017
Suppliers Can Offer Technical Solutions for New Cannabi…
Here’s a look at how a few manufacturers have partnered with growers to make their transition into cannabis a smooth one, whether it’s through hands-on guidance or partnering with other industry leaders.
April 18, 2017
Cool Combos From CAST 2017 – Editor’s Choic…
With container gardening becoming more of a lifestyle among consumers than a trend, and breeders continuing to put more effort in container mixes and components, I feel I would be remiss if I didn't share some of the special combinations that not only caught my eye at California Spring Trials, but absolutely took my breath away and made me want to immediately get started gardening.
April 17, 2017
LumiGrow’s Latest Lighting Research Highlighted in Grow…
Industry leaders representing a broad range of vegetable, floriculture, and cannabis producers gathered to learn how to implement modern lighting strategies for their own production.
April 16, 2017
Danziger Invests in Continued North American Business G…
As part of a new business structure for its North American market, Mike Fernandez has been appointed Market Manager North America for Bedding Plants and Perennials, and Kate Zvara was named as Key Account Manager and Retail Specialist.
April 15, 2017
How Oregon Growers Are Making Lean Improvements With He…
The Oregon Nursery Lean Consortium recently helped two Pacific Northwest growers realize significant productivity gains and labor savings.
April 14, 2017
How to Trial a New Product Before You Use It in Your Gr…
Before you apply a new product on a plant, you want to make sure it is safe and effective. Technical experts from Kemin have compiled a five-step guide designed to help you measure the benefits of a new product you want to incorporate into your operation.