Influence of Fertilizer Rate on Swollen Stem Formation (“Bulbing”) and Vitamin C Content in Different Kohlrabi Cultivars
Mark Iradukunda
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08/16/2021
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Description
In this greenhouse study, we fertilized four potted kohlrabi cultivars with a common water-soluble greenhouse fertilizer (Peters Professional 20-10-20) at zero, one-half recommended, recommended, and double recommended rates where the recommended rate plants received 308mg each week in irrigation water. Results showed that plants of all cultivars that received the double rate of fertilizer had the highest yield with a fresh swollen stem weight of 448 g, while plants that received no fertilizer had the lowest yield with 21.2 g and they were visibly nutrient deficient. An Increase in fertilizer rate increased the vitamin C content where the total vitamin C per swollen stem averaged 6853 mg for the double rate and 846 mg for the zero rate. The results from this study will help farmers to effectively apply fertilizers to increase kohlrabi yields and vitamin C content while doing less harm to the environment caused by excessive fertilizing. In return, this will help people to get more vitamin C sources which may improve their health.
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- [00:00:01.720]Hello,
- [00:00:02.920]welcome to my presentation about the influence of Fertilizer rate on swollen
- [00:00:07.630]stem formation and Vitamin C content in different Kohlrabi cultivars.
- [00:00:13.150]My name is Mark Iradukunda
- [00:00:14.740]I'm a senior student at university of Nebraska Lincoln.
- [00:00:18.910]This research was supervised by Dr.
- [00:00:20.740]Paul read in the department of agronomy and horticulture.
- [00:00:23.800]It was also funded by the UCARE program.
- [00:00:29.070]Well, this is kohlrabi.
- [00:00:31.650]Kohlrabi is a vegetable crop that is found new Brasscasea family.
- [00:00:35.760]It's a good crop because it grows fast.
- [00:00:37.740]It can be transported easily and can be used in various dishes.
- [00:00:43.360]Kohlrabi has nutrients like Potassium and antioxidants like vitamin C,
- [00:00:48.310]which helps in oxidative damage repair and strengthens the immune system.
- [00:00:53.480]Unfortunately many people in the United States and around the world.
- [00:00:56.770]Luck in vitamin C,
- [00:00:58.330]which puts their lives in danger of getting some diseases like scurvy.
- [00:01:02.830]And the lack of that antioxidant can encourage the growth of cancer cells.
- [00:01:07.330]So we believe exploring vitamin C sources like Kohlrabi may
- [00:01:12.250]contribute to improve human.
- [00:01:13.930]Health.
- [00:01:16.210]Nitrogen containing fertilizers have been found to improve the size and the
- [00:01:20.410]quality of kohlrabi,
- [00:01:22.270]but there are no comparisons between different application rates in different
- [00:01:26.470]cultivars and how that affects the vitamin C content, you know,
- [00:01:30.650]We hypothesis that Kohlrabi grows faster with more fertilizer,
- [00:01:35.080]Vitamin C levels increase as increased fertilizer levels,
- [00:01:39.220]and the effects are the same in all cultivars.
- [00:01:45.730]We believe the results from this study will help farmers to effectively apply
- [00:01:50.440]fertilizers, to increase yields and Vitamin.
- [00:01:55.000]C content
- [00:01:58.300]farmers will be able to reduce harm to the environment that is caused by
- [00:02:01.930]excessive fertilizing.
- [00:02:04.690]After all,
- [00:02:05.650]We want to be able to help want to be able to help people to get more vitamin C
- [00:02:09.640]sources, which will improve their health.
- [00:02:14.770]In order to do our study,
- [00:02:16.000]we took a commonly used the greenhouse fertilizer Peter's professional 20 10 20.
- [00:02:21.790]The recommended rate for this fertilizer is a 6.16 in grams per litter
- [00:02:26.800]We did someone numbers and found that each week every plant would receive about
- [00:02:31.540]308 Milgrams of fertilizer.
- [00:02:35.200]We took that amount of fertilizer. We made a double of it,
- [00:02:38.230]one half and a zero
- [00:02:42.520]we then took four Kohlrabi cultivars, including Azur Star, Konan F1,
- [00:02:47.380]Ukzar, and white Vienna.
- [00:02:50.620]Within.
- [00:02:51.730]One cultivar, we took a group of plants and treated it with
- [00:02:56.620]double, recommended rate, one half,
- [00:02:59.350]and another group of plants with zero rate. we
- [00:03:02.730]repeated that process in all cultivars and made four replicates and
- [00:03:07.330]distributed our plants in a completely randomized book design in
- [00:03:12.160]agronomy and horticulture, teaching greenhouse on east campus.
- [00:03:16.540]As we can see on the picture. These are the transplants.
- [00:03:22.120]Every day,
- [00:03:22.660]we watered our plants and checked for anything. On every Friday would take 50
- [00:03:27.430]milliliters of fertilizer and applied it to our plants. After one
- [00:03:32.320]week, On the next Friday,
- [00:03:34.510]we would measure the height and width using the rulers.
- [00:03:38.440]We would also measure the swollen stem diameter using the calipers.
- [00:03:44.160]At the end of the our study,
- [00:03:46.060]we harvested cut the leaves, and the roots and then weighed,
- [00:03:50.800]the swollen steam. After that,
- [00:03:55.330]we
- [00:03:57.490]extracted vitamin C from a ground wet tissue from Kohlrabi
- [00:04:02.440]We recorded our data in the Google sheets and analyzed the
- [00:04:07.520]data using Microsoft Excel and the Google sheets.
- [00:04:11.410]Then we've got our results from this picture.
- [00:04:14.710]We can easily see that the more fertilizers we applied,
- [00:04:18.070]the more growth we got on the plants and the results of the same in all cultivars,
- [00:04:22.210]the plants were treated with the most fertilizer had the bigger greener
- [00:04:27.670]leaves while the plants treated with no fertilizer were very small and
- [00:04:32.080]visibly nutrient deficient,
- [00:04:34.000]and the results are the same in all cultivars. We studied
- [00:04:40.330]when we increase the fertilizer,
- [00:04:41.590]the height in all the cultivars increased just a small observation
- [00:04:46.330]and an exception here is that, uh,
- [00:04:49.570]increasing from one fertilizer rate to the next rate increase was about a
- [00:04:54.400]19% increase. However, uh,
- [00:04:58.270][inaudible] moving from the recommended rate to the double rate,
- [00:05:01.060]the increase was about 119% increase
- [00:05:07.000]As We added the more fertilizer cultivars,
- [00:05:09.490]the width of plants increased and the results were the same all cultivars.
- [00:05:16.120]Those that's also the same, uh,
- [00:05:17.800]in instilled with diameter or the size of the soul,
- [00:05:20.830]and the same as we will see on the next picture.
- [00:05:23.170]So the more Follies are we applied in all cultivars, the bigger,
- [00:05:27.100]the size of Seoul and stem God.
- [00:05:29.860]This picture shows that the more or less applied to the, uh, the bigger,
- [00:05:33.760]the size, um, swollen stems we got and, uh,
- [00:05:37.870]an observation is that moving from zero to one and a half,
- [00:05:40.900]had more impact on the Kirby, uh, than moving from recommended,
- [00:05:45.370]right to the double rate and the observations of the same inequality.
- [00:05:50.950]We were more focused on this, uh,
- [00:05:53.350]the yields of Kirby and also vitamin C and the weight of Kirby
- [00:05:58.250]increased as increase the fertilizers and the results are the same, you know,
- [00:06:02.000]cultivars. It's just an exception that why Vienna had a lighter plants.
- [00:06:06.920]And that is because like Vienna is not paid pollinated plants where others are
- [00:06:11.660]modified vitamin C concentration decreased as we increased the fertilizer
- [00:06:16.220]rates in all Potiphar's, however, vitamin C content,
- [00:06:20.690]the total vitamin C in the whole swollen stem increased as increases the fall
- [00:06:24.440]lasers.
- [00:06:25.610]An exception is Xer where moving from recommended to the double,
- [00:06:29.660]we didn't see much increase and moving from recommended to the double on the wet
- [00:06:34.130]Vienna actually got, um,
- [00:06:35.960]reduced vitamin C content from this data,
- [00:06:39.980]we can conclude that an increase in the laser increases karate height would
- [00:06:43.940]solve some of the emigrant weight and they fix the Seminole cultivars.
- [00:06:48.170]They'll divide them in C concentration decreases as increased the fertilizer.
- [00:06:51.950]They total vitamin C content increase as we increase the fertilizer rates.
- [00:06:56.420]So it can, uh, tell foamers that before playing footless, let's give you,
- [00:06:59.930]it's very important to first identify their purpose. I,
- [00:07:03.570]before playing foot lasers,
- [00:07:06.130]I have to do more increments and have more data and be more competent in our
- [00:07:09.610]data. Also,
- [00:07:10.660]future studies can help us understand what makes different cultivars
- [00:07:14.820]To act differently on the same, fertilizer rates,
- [00:07:19.930]I would like to thank my authors, including Dr. Read and Ben, at,
- [00:07:24.010]university of Nebraska Lincoln, and, uh,
- [00:07:26.470]everyone who provide the feedback on the research and a presentation,
- [00:07:29.700]including Marc van lersel at university of Georgia, Sam Wortman and
- [00:07:34.270]Nebraska. I would also like to thank the UCARE program for funding this
- [00:07:39.880]these research. These are my reference. Thank you.
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