With Instructables you can share what you make with the world, and tap into an ever-growing community of creative experts.
Tell us about yourself!
Kratky's non-circulating hydroponics
Please reference the pictures of nutrient included in this instructable for more information regarding nutrient ratios for specific plants. If the answers to your questions can't be answered from what I've provided please consult your local university's horticultural department, a hydroponics retailer, or a company that manufactures NPK.
The ratio I use is one gallon of nutrient water per head of lettuce--usually one month to six weeks. You can just start over with new seed once the water has been used up or you can refill half way if the plant has more to offer.
You can totally do this indoors!
Hi, sorry for the delayed response... For the nutrient, a 9-9-9 NPK is a base formula that you augment based on what you are growing. You should find nutrients specific to vegetables and/or fruit and you should not compromise quality. I grow my lettuce outside, under our house eaves, you'll want to prevent rain water from diluting your nutrient solution. I plant my seed directly in the net pot all the time. You should absolutely fill your container with nutrient solution to the net pot so that the moisture and nutrient reach the seed. Only when refilling do you fill it up part way so that the roots can take up oxygen and not drown. I'm not sure how the lettuce will do at that temperature, but my guess is that it will grow more like a vine than a tight cluster (still edible) and you will have to refill the nutrient more often. One more thing... I've changed my growing medium to cinder and am much happier with the results... No algae!
Thanks Diane,I will keep in mind your advise while experimenting.Pls suggestHow to find which nutrients are specific to different crops.PLS suggest nutrient forLettuceCucumber Tomato SpinachCorianderCan I buy say NPK 20 20 20 And then modify to suit the specific type.Thanks
Hi Diane,Thanks for a very informative post.I now realise the mistakes i have been making with my hydroponic experiments.I still have some questions.1.What difference will it make if we use any other nutrient formula say 9-9-9 NPK or any other.2.How does the lettuce perform in open? Do we need to cover and isolate the growing containers/ area with a plastic sheet or net.3.Can we plant the seeds directly in the net pot or should we plant the seedlings.4.If we start with seeds why do we need to keep some empty space in the container. Why not fill it up completely till it touches the bottom of the net pot.5 How can we grow lettuce if the outside ambient temperature is above 40°C.ThanksArun
I've done great in 18 gal totes as well with tomatoes, cucumbers, eggplant, and zucchini. It really is hands off and fun to see how fast it grows. We're moving to a bigger place with a small yard so I'm very excited to get my kratky up and running again with more variety. I want to try a strawberry plant.
You would refill the res with more water nutrient mix. This is a non-electric, non-circulating system. All you do is add nutrient mix, plant and grow.
Join 2 million + to receive instant DIY inspiration in your inbox.
Download our apps!
© 2016 Autodesk, Inc.