In the future,Growing Systems growers will provide little root volume in order not only to reduce media cost but to maximize control over mineral nutrition, pH, aeration and root diseases. Unbelievably high salt levels are maintained in the root systems where the E.C. of the feed solution will approach 3.5 and the drain water at an E.C. of 4.5 to 5.0. This helps to control plant growth as well as flavor of the tomato fruit. All systems in the future will be closed, with no drainage, preventing any loss of mineral elements and the contamination of groundwater. For health reasons, hydroponic systems may be used to reduce nitrogen levels in leafy vegetables at harvest. This is especially true in Europe for such crops grown under low winter light intensities.

 

Pest control

Early hydroponic operations were devastated by pest problems. White flies, leaf miners, pin worms, nematodes, Cladosporium leaf mold and viruses, as well as root diseases such as Pythium root rot and bacterial wilt, were common. Today, unlike 20 years ago, the drain solution is often sterilized (Runia, 1995). The options are heat treatment, ozone and ultraviolet radiation. The University of Arizona has a program to control certain root diseases with surfactants or by using nonchemical approaches. While the results are not yet practiced in Growing Systems hydroponic systems, the results look promising.

While there are many types of growing systems, the two most popular growing media today are rockwool and perlite. Due to the high cost of rockwool, root volume is being reduced. Growers in Arizona are growing six tomato plants from a rockwool slab no bigger than 7.5 x 130 x 15 cm. Each plant has a root volume no greater than 2438 cm3. (A gallon contains 3608 cm3.) The irrigation system may be activated more than 30 times per day. At the University of Arizona, excellent tomato crops have been grown in a container no larger than 956 cm3. In this case, the irrigation system was left on continuously to optimize root aeration, pH, and nutrition. Maximum yields were 12.8 kg of tomatoes per plant over a 6-month period.

 

In the future,Growing Systems growers will provide little root volume in order not only to reduce media cost but to maximize control over mineral nutrition, pH, aeration and root diseases. Unbelievably high salt levels are maintained in the root systems where the E.C. of the feed solution will approach 3.5 and the drain water at an E.C. of 4.5 to 5.0. This helps to control plant growth as well as flavor of the tomato fruit. All systems in the future will be closed, with no drainage, preventing any loss of mineral elements and the contamination of groundwater. For health reasons, hydroponic systems may be used to reduce nitrogen levels in leafy vegetables at harvest. This is especially true in Europe for such crops grown under low winter light intensities.

 

Pest control

Early hydroponic operations were devastated by pest problems. White flies, leaf miners, pin worms, nematodes, Cladosporium leaf mold and viruses, as well as root diseases such as Pythium root rot and bacterial wilt, were common. Today, unlike 20 years ago, the drain solution is often sterilized (Runia, 1995). The options are heat treatment, ozone and ultraviolet radiation. The University of Arizona has a program to control certain root diseases with surfactants or by using nonchemical approaches. While the results are not yet practiced in Growing Systems hydroponic systems, the results look promising.

 

Today integrated pest management (IPM) is of particular interest to Americans in CEA because of the paucity of pesticides with legal clearance for use in greenhouses. The frightening ability of some pests to develop resistance to chemical pesticides has revived worldwide interest in the use of natural enemies of insect pests, particularly when used in association with horticultural practices, genetics and other control mechanisms. Tomorrow's growers may be growing crops without applying any chemicals to control diseases and insects. Crop production requires both the identification of possible crop disease and insect problems, and the ability to properly integrate disease and insect prevention and control practices into a total management Growing Systems plan.

 

OVERVIEW

 

Hydroponic culture is an inherently attractive. s conception. However, in recent years, extensive research and development programs in Europe have vastly improved hydroponic production systems. These new technologies are today being successfully transferred to the United States, proving hydroponics a technical reality in the high light regions of the desert southwest.

 

Each crop is very specific in its environmental requirements. To deviate at all will decrease both the desired yield and quality of a product Added to this, seed or propagation material must possess the genetic characters suited to the environment in which it is grown. Most growing systems will work well horticulturally, but systems can differ considerably in cost. Regardless of the type of system, greenhouse agriculture can be extremely expensive. There is no room for mistakes. The cost of CEA may be more than compensated by the significantly higher productivity of greenhouse agriculture as compared to open field agriculture.The technology of hydroponic systems is changing rapidly with systems today producing yields never before realized. In the last four years, nearly 40 ha of greenhouses have been built in Colorado, Nevada, and Arizona. Many more hectares are planned, not only in the Southwest, but in Mexico. The future for hydroponics appears more positive today than any time over the last 50 years. I sincerely believe Growing Systems hydroponics will be fashionable again!
Today integrated pest management (IPM) is of particular interest to Americans in CEA because of the paucity of pesticides with legal clearance for use in greenhouses. The frightening ability of some pests to develop resistance to chemical pesticides has revived worldwide interest in the use of natural enemies of insect pests, particularly when used in association with horticultural practices, genetics and other control mechanisms. Tomorrow's growers may be growing crops without applying any chemicals to control diseases and insects. Crop production requires both the identification of possible crop disease and insect problems, and the ability to properly integrate disease and insect prevention and control practices into a total management Growing Systems plan.

 

OVERVIEW

 

Hydroponic culture is an inherently attractive. s conception. However, in recent years, extensive research and development programs in Europe have vastly improved hydroponic production systems. These new technologies are today being successfully transferred to the United States, proving hydroponics a technical reality in the high light regions of the desert southwest.

 

Each crop is very specific in its environmental requirements. To deviate at all will decrease both the desired yield and quality of a product Added to this, seed or propagation material must possess the genetic characters suited to the environment in which it is grown. Most growing systems will work well horticulturally, but systems can differ considerably in cost. Regardless of the type of system, greenhouse agriculture can be extremely expensive. There is no room for mistakes. The cost of CEA may be more than compensated by the significantly higher productivity of greenhouse agriculture as compared to open field agriculture.The technology of hydroponic systems is changing rapidly with systems today producing yields never before realized. In the last four years, nearly 40 ha of greenhouses have been built in Colorado, Nevada, and Arizona. Many more hectares are planned, not only in the Southwest, but in Mexico. The future for hydroponics appears more positive today than any time over the last 50 years. I sincerely believe Growing Systems hydroponics will be fashionable again!