Stuppy Greenhouse Blog

Environmental Control

Posted by Phil Bishop on Dec 8, 2017 3:36:59 PM

THE BASICS OF CONTROL

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Topics: Greenhouse Operations

To Those Impacted by Hurricane Harvey

Posted by Phil Bishop on Aug 28, 2017 1:00:13 PM

August 28, 2017 

 

Dear Texas & Louisiana Growers,

 

Throughout the weekend we have watched and prayed as Hurricane Harvey moved along the coast of Texas.  We hope you, your families and friends are safe and cared for. 

Your families, friends, and employees come first right now.  Nurseries and greenhouses can wait until everyone is safe, sound, and dry.  When the time is right, we are ready to help.  Not just with your greenhouses, but with anything you might think we are able to provide.  In the past, we have shipped tools and other building supplies to customers who were unable to obtain them locally.  Please consider us a resource in the upcoming weeks. 

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Topics: Greenhouse Operations

The Value of Good Greenhouse Control

Posted by Phil Bishop on Aug 16, 2017 2:30:00 PM

A DYNAMIC ENVIRONMENT

Greenhouse environments present unique challenges to good control. Temperature changes occur rapidly and vary widely depending on solar radiation levels, outside temperatures and humidity levels, wind speed and direction, the amount of plant material in the greenhouse, watering routines, etc. Proper control of this dynamic environment is indeed challenging, but the benefits of good control far exceed the costs.

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Topics: Greenhouse Operations

We Have Greenhouse Doors Here!

Posted by Phil Bishop on Aug 14, 2017 12:56:07 PM

Channeling my best baseball peanut salesman.

How can anyone or better yet why would anyone spend time on an article about greenhouse doors? I mean it is pretty straight forward. Right? Basically, yes but as with any accessory of a greenhouse there needs to be thought put into it for it to be useful and worthwhile.

You’re building a greenhouse and you come across the line item of doors in the design phase. You need to get in and out of the greenhouse, equipment is coming in and out, possibly vehicles need access, the point is there is the plan for now and a need to plan for the future.This is not a very in depth topic, but look out 5 years and think what will I be growing? Will your access to the greenhouse need to change? Be sure to plan around this.

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Topics: Greenhouse Operations

Greenhouse Irrigation

Posted by Phil Bishop on Jul 17, 2017 2:00:00 PM

Why is watering so important?

Crop quality is closely tied to plant irrigation. Both the amount and the timing of watering are important, and should be carefully planned and monitored. Next to light, watering is the next most critical production factor.

What are the effects of under watering?

Even mild under‐watering causes photosynthesis to shut down. When plants lack adequate water for uptake, all aspects of plant development become stunted: leaves, fruit, flowers, stem growth are all affected. Depending on the stage of plant and degree of water stress, this stunting can have a permanent effect on the plant. Severe under‐watering results in a burned appearance on the foliage and flowers.

What are the effects of overwatering?

Excessive watering can be as or more damaging to the crop as under‐watering. The soil environment which is conducive to plant growth contains both readily available water and air. When soil is over‐watered, the air is ‘driven out’ of the soil, and the roots are unable to survive very long in this condition. If persistent, the roots die, and the plants are unable to uptake the water and nutrients they need. A wet root environment also promotes many root diseases.

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Topics: Greenhouse Operations

Greenhouse Ventilation and Cooling

Posted by Phil Bishop on Jul 12, 2017 12:00:00 PM

What is ventilation?

Ventilation is the exchange of air between the inside and outside of the greenhouse. It is used to remove heat from solar radiation, to replenish carbon dioxide and to help control the levels of relative humidity.

What is a ventilation rate?

The ventilation rate refers to the amount of ventilation per unit area. It is measured as cubic feet of air‐ per‐minute per square foot of greenhouse floor area (CFM per square foot) because the heat load derives from solar radiation and is directly proportional to floor area.

What is the difference between natural and mechanical ventilation?

Natural ventilation results from the wind and stack action from ventilator sashes. Mechanical ventilation is created by electric fans and related equipment.

What does cooling refer to?

Cooling consists of reducing the air temperature by the evaporation of water into the air‐stream. The system that does this and moves the cooled air through the greenhouse and exhausts the warmed air is the cooling system.

What is circulation?

Circulation is the movement and mixing of air in a greenhouse to promote uniformity in temperature and humidity and to provide proper air motion throughout the greenhouse.

This article is brought to you by the NGMA

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Topics: Greenhouse Operations

Insect Screening for your Greenhouse

Posted by Phil Bishop on Jul 3, 2017 9:00:00 AM

What are the advantages of insect screening?

Properly installed insect screening restricts the entry of insects and pests and reduces exposure to pesticides.

What are the disadvantages of insect screening?

While manageable, the disadvantages of insect screening includes increased sizing and fastening problems, less ventilation, reduced access to the greenhouse, and added maintenance. In addition screens can keep insects in as well as out.

What are the negative effects screens have on airflow?

Screens with small holes are more effective in excluding pests but are more resistant to airflow. A screen with too much restriction of airflow can cause higher static pressure drops, inadequate air exchange, increased energy consumption by the fans, excessive wear on the fan motors, and higher greenhouse temperatures.

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Topics: Greenhouse Operations

Greenhouse Energy Conservation

Posted by Phil Bishop on Jun 5, 2017 9:00:00 AM

Why save energy?

  • Purchased energy is a significant and ongoing expense for most greenhouse operations. There is high probability that energy prices will continue to rise.
  • Most greenhouse operations have the ability to economize on fuel use.

Energy is consumed all the time, year after year. Once it is consumed, you can never get it back. Anytime you can save energy costs, you are moving money directly to your bottom line, increasing your margins and competitiveness. Energy efficient systems are usually engineered for optimum conversion, distribution and retention of heat. They can often produce better, more uniform crops, as well as being good for the environment. Even if it takes additional capital to achieve the highest level of energy saving, today’s interest rates are low, and the long life of many energy saving greenhouse system components make them sound investments.

This article is brought to you by the NGMA

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Topics: Greenhouse Operations

Electrical Systems & The Greenhouse

Posted by Phil Bishop on May 29, 2017 9:00:00 AM

How does electricity work?

Electricity moves through wires, pushed along by a force called potential. Electric potential is measured in units of volts. The voltage forcing electricity through the power wiring comes from a utility company’s generating plant. Large wires are needed to carry large currents. Electricity faces resistance to its flow through a wire, and in fact, resistance is the electrical term for the force that works against the free‐flow of electricity. Resistance is measured in units called ohms.Electricity, voltage and current all work together to form power, which is measured by watts.

This Article is brought to you buy the NGMA

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Topics: Greenhouse Operations

Chemical Cautions in a Greenhouse

Posted by Phil Bishop on May 22, 2017 9:00:00 AM

Who is in charge of pesticide regulation?

The Environmental Protection Agency (EPA) regulates the pesticide industry under the Federal Insecticide, Fungicide and Rodenticide Act. With this law the EPA is permitted to control all aspects of pesticide use, from production through the disposal of empty containers. In many states, the Department of Agriculture is the inspecting and compliance entity for the EPA concerning pesticides.

What is the EPA Worker Protection Standard (WPS)? The Worker Protection Standard is a regulation issued by the Environmental Protection Agency. It covers pesticides used in the production of agricultural plants on farms, forests, nurseries, and greenhouses. The WPS requires you to take steps to reduce the risk of pesticide‐related illness and injury if you use such pesticides or employ workers or pesticide handlers who are exposed to such pesticides.

This article is brought to you by NGMA

If you are an agricultural pesticide user and/or an employer of agricultural workers or pesticide handlers, the WPS requires you to provide to your employees, and in some cases, to yourself and others:

  • information about exposure to pesticides
  • protections against exposures to pesticides
  • ways to mitigate exposures to pesticides

The WPS regulations went into effect on January 1, 1995, and can be found in the EPA’s How to Comply Manual, 40CFR170.

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Topics: Greenhouse Operations

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