Posts Tagged ‘Harvest Excel’
21 Feb 2014

Size your Tarp

Have you ever bought blackout tarp only to realize you forgot to account for the ends? Or some other crucial measurement? Save yourself the headache, we made for you a handy chart. And remember, if you plan on using the Golden Arm Tarp Puller, be sure to add enough extra slack to make uncovering and covering your greenhouse a breeze.

Photo Credit: Huber CAD

5 Feb 2014

Light-Dep: The Future of Growing

A grower who can beat weather and market conditions and have more than a single crop in a growing season will have huge advantages in the market place. Northern climates are particularly vulnerable to adverse weather and short growing seasons; just as the crop is beginning to mature, rain, mold and other conditions can ruin a much anticipated harvest. By “fooling” the plants to mature during the height of summer these problems can be mitigated. Northern California has always been a trend setter in growing and light-dep is no exception. Light-dep techniques have been used and perfected here for many decades. Light deprivation is now fast becoming the preferred method of growing throughout most regions. Growers are finding that the intensity of mid-summer sun and the lower humidity levels are allowing them to command premium prices for a superior product that’s available before the market place is glutted by outdoor fall harvest. With the “green” movement gaining momentum and the desire to become carbon neutral, along with a more predictable high quality harvest many indoor growers are switching to light-dep and this trend will surely accelerate across the country. Overhead costs are significant with indoor and using the sun’s natural energy is an obvious way to increase profit.

In addition, we believe the drought will play a significant role in driving people into the light dep arena, as water shortages may mean a full term crop in 2014 will not be possible.

Light-dep greenhouse, Golden Arm Tarp Puller and Push Rod installed

12 Nov 2012

Vegetable Planting Guide

UC Agriculture and Natural Resources delivers healthy food systems, healthy environments, healthy communities and healthy Californians. From more bountiful berries to safer food to cleaner water, ANR turns science into solutions.

They have created a vegetable planting guide for the Sacramento area of Northern California. The planting guide outlines:

  • -Preferred time to seed in a greenhouse or other
  • -Preferred time to seed in a protected area (e.g. coldframe, well lit window)
  • -Preferred time to transplant
  • -Preferred time to direct seed

You can visit the complete guide to planing by visiting the UC Davis ANR website.

12 Nov 2012

Light Dep: An Overview

Since the dawn of time, farmers have understood the role of light in plant growth; it wasn’t until the beginning of the twentieth century that we began to understand the importance of darkness. In 1913, the French graduate student Julien Tournois discovered that hops and hemp grown under glass would flower precociously in winter. He also observed that the plants would flower most rapidly when allowed only six hours of daylight[1].

Tournois’s research ended when he died on the front during World War I, but a few years later two American scientists, Wrightman Garner and Harry Allard, unwittingly expanded upon Tournois’ findings. Wrightman and Allard discovered that certain plants bud more readily when they sense a change in seasons, or rather: Certain plants will begin to bud when they sense a change in the ratio of daylight hours to nighttime hours. Garner and Allard immediately saw the implications for agriculture. They began experimenting on a range of plant species and discovered that day length influences many aspects of plant activity, including dormancy, flowering, and potential yield[2]. In 1920 they noted: “under the influence of a suitable length of day, precocious flowering and fruiting may be induced[3].”

Garner and Allard invented a word to describe a plant’s sensitivity to day length: Photoperiodism. Photoperiodism is a biological response to a shift in the proportions of light and dark in a 24-hour cycle. Photoperiodic plants measure
hours of darkness in order to keep track of the seasons and thus flower at an appropriate time of year.

The two scientists began classifying plants as long-day plants (LDP), day-neutral plants (DNP), and short-day plants (SDP). Day-neutral plants can flower at any time of year, depending on other conditions. Long-day plants flower naturally in high summer, when the nights are shortest. Short-day plants flower naturally when the nights are long: either in early spring or in late summer and early autumn. Short-day species include chrysanthemums, poinsettias, cosmos, globe amaranth, rice, hyacinth bean, and some varieties of marigold, orchid, and strawberry; as well as and a number of other high-value specialty crops.

Short-day is actually something of a misnomer: short-day plants sense darkness, not light. When sensors in your plant’s leaves indicate that each 24-hour cycle includes 12 or more hours of sustained, uninterrupted darkness, your plant’s apical meristems (growing tips) will shift priorities: instead of producing more leaves and stems, the plant will begin to produce floral structure.

In Photoperiodism in Plants, Thomas and Vince-Prue expand upon the concept: “Perhaps the most useful proposal is that of Hillman (1969), who defined photoperiodism as a response to the timing of light and darkness. Implicit in this definition is that total light energy, above a threshold level, is relatively unimportant, as is the relative lengths of the light and dark period. What is important is the timing of the light and dark periods, or, to think of it another way, the times at which the transition between light and dark take place.”

Biologist P.J. Lumsden also emphasized the importance of precise timing, noting: “…photoperiodic responses require a time-measuring mechanism, to which is closely coupled a photoperception system. Further, the time-keeping mechanism must operate very precisely and it must be insensitive to unpredictable variations in the

In other words: absolute darkness is not necessary to trigger a photoperiodic response in SDP, but consistency of dark-to-light ratios is essential. During a 1938 experiment on the effects of light on xanthium, Karl Hamner and James Bonner discovered that the benefits of a long night could be reduced or abolished if the darkness was interrupted for even a few minutes[4]. The converse was not true: the flowering process was not reversed when the daylight hours were interrupted with

Growers of SDP crops have been using light deprivation research to their advantage for decades. For example, poinsettia farmers use automated greenhouses to ensure that plants bloom for the Christmas season. More recently, light deprivation technology has caught on in other specialty gardening industries.

Light deprivation is an ideal method for farmers who want to bring a crop to market before the market floods during the harvest season. The method also allows farmers to avoid potential rain damage by harvesting when weather conditions are ideal. Perhaps more importantly, light deprivation offers the opportunity to plant and harvest twice during one growing season and thereby double annual yield.

To utilize light dep, farmers plant crops in hoop houses or greenhouses, which are covered with opaque material for a period of time each morning or evening. The goal is to block sunlight and increase the number of hours the crop spends in darkness: more than 12 hours of darkness will stimulate flower growth in most SDP plants. The challenge is to keep the schedule consistent and to ensure that the darkness is not interrupted, either by unseen rips in the covering, shifts in the covering caused by wind, or human error. As Hamner and Bonner demonstrated, interruptions or inconsistencies in the light deprivation cycle can confuse the plant and slow flower growth.

Many light dep farmers still work manually, a less than ideal situation. Hiring workers to pull tarps leaves ample room for imprecision in timing, not to mention the high labor costs of paying two or more employees to spend several hours a day arduously tarping and untarping hoop houses.

At Harvest Excel, we are changing the marketplace. Automated greenhouses minimize human error and scheduling problems to allow for precise timing and an easy, streamlined process that prevents rents and other forms of light leakage. By minimizing effort, farmers are maximizing yield. We create affordable and excellent light dep technology that will allow you to take full advantage of a photoperiodic crop’s potential.

[1]“Photoperiodism in Plants” by P.J.
Lumsden; Biological Rhythms; Narosa
Publishing, 2002.

in Plants by Brian Thomas and Daphne Vince-Prue; Academic Press, 1997.

[3]“Effect of the Relative Length of
Day and Night and Other Factors on Growth and Reproduction in Plants” by W.W.
Garner and H.A. Allard; Journal of
Agricultural Research, 1920

of Growth and Development in Xanthium by Roman
Maksymowych; Cambridge University Press, 1990


20 Oct 2012

Light Deprivation Techniques

What Are Light Deprivation Techniques?

Light deprivation has been used in various forms of agriculture for centuries. However, over the last decade the use of light deprivation in greenhouses has increased throughout the US.

Light deprivation (or “light dep” for short) is a method of reducing the light cycle of flowering plants. The greenhouse is actually covered to block light, thereby depriving gardens of a prolonged photoperiod (the period of time each day during which an organism receives illumination).

For many different types of plant cultivation, this process is integral to ensuring that plants stay in the flowering stage – a growth phase that requires 12 hours (or less) of light. Once the photoperiod begins to exceed 12 hours, flowering plants are in danger of reverting back to their vegetative stage of growth. This makes light deprivation techniques crucial for farmers who rely on timely crops.

One added benefit of using light-dep techniques lies in the ability to squeeze in an extra harvest during the summer months, when the Sun naturally provides a prolonged light cycle. By covering the greenhouse and limiting the daylight that plants receive to 12 hours, greenhouse growers can force a crop to flower earlier in the summer and get an extra harvest in before the traditional fall harvest.