HYDROPONIC LETTUCE ON THE "ARCHWAY"
It has been calculated by some growers that by using the archway concept as much as $160,000 can be grossed on 1/3 acre - if you sell at 50 cents wholesale per head (leaf or Bibb). How? Well, Irish growers can get 8-9 crops per year! The arch or A-frame concept gives you more than double the growing space. You can get 34 plants per square yard! HOW DO THEY DO THAT? First the archway is sited in a N-S direction. Second, PVC troughs 4 inches wide and 3 inches deep are slanted in a slope of 1 inch to every 30 feet and are thus staggered from the top of the arch to the bottom. Matting is placed in the bottom of the troughs and drip irri- gation is used for feeding. (Here drip irrigation means allowing the nutrient to flow slowly from top to bottom.) The lettuce seeds are planted into two-inch rockwool cubes. When the seeds have sprouted and grown to seedling size, the plants are placed in the PVC tubing at intervals of 8 inches apart. One grower has his troughs staggered twelve high! But the best pattern seems to be six double rows on each side of the arch or "A". The Irish also use 1 1/4 inch diameter PVC pipe in 6 1/2 foot lengths. They drill 3/4 inch holes every 7 5/8 inches. They then insert the seedling's roots into the hole and allow the leaves to rest on top of the tube. The results are very good. The grower can market "clean" lettuce because nothing ever touches the plant except the nutrient flow at the roots. In my opinion, this size tubing is too small. It promotes root clogging and poor plant growth at the far end of the tube. But the Irish say they have no problem with it. There have been no root death or other diseases for these year-round operations. One of the biggest problems with growing gourmet salad greens is the labor involved. The A-frame used by the Irish would eliminate a lot of this since the lettuce would already be clean - you wouldn't have to wash it. Also it would be easier to harvest from the A-frame than from some other hydroponic systems. Several A-frames shouldn't be too big a problem. And once they're up, they're up! Anyway, it's something to think about. CONTENTS PAGE ..CONTACT US... HOME PAGE...ORDERING INFORMATION bsaffell@mayhillpress.com ... copyright 2008 by Hilmur Saffell...Last Update = 52008 WE HAVE THREE BOOKS THAT MAY BE OF INTEREST TO YOU.
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