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Article

Effects of Organic Fertilizer on Bok Choy Growth and Quality in Hydroponic Cultures

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Center for International Field Agriculture Research and Education, College of Agriculture, Ibaraki University, Ami 4668-1, Ami, Inashiki, Ibaraki 300-0331, Japan
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Division of Food Processing and Distribution Research, Food Research Institute, National Agriculture and Food Research Organization, 2-1-12, Kannondai, Tsukuba, Ibaraki 305-8642, Japan
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Division of Rice Research, Institute of Crop Science, National Agriculture and Food Research Organization, 2-1-2, Kannondai, Tsukuba, Ibaraki 305-8518, Japan
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Faculty of Agriculture, Universitas Gadjah Mada, Bulaksumur, Yogyakarta 55281, Indonesia
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Department of Environmental Science, Faculty of Human Environment, University of Human Environments, Kamisanbonmatsu 6-2, Motojuku, Aichi 444-3505, Japan
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Biosphere Science Division, Agro-ecosystem Course, Graduate School of Environmental Science, Hokkaido University, Sapporo Kita 11 Nishi 10, Hokkaido 060-0811, Japan
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Division of Vegetable Pest Management and Functional Analysis, Institute of Vegetable and Floriculture Science, National Agriculture and Food Research Organization, 360, Kusawa, Ano, Tsu, Mie 514-2392, Japan
*
Author to whom correspondence should be addressed.
Academic Editors: Alberto San Bautista and Carmelo Maucieri
Agronomy 2021, 11(3), 491; https://doi.org/10.3390/agronomy11030491
Received: 6 January 2021 / Revised: 2 March 2021 / Accepted: 2 March 2021 / Published: 6 March 2021
(This article belongs to the Section Farming Sustainability)
Effects of corn steep liquor (organic fertilizer, OF) and conventional chemical fertilizer (CF) on the growth and yield of bok choy (Brassica rapa var. chinensis) in summer and autumn hydroponic growing systems were compared. When OF and CF were applied with the same amount of total nitrogen in summer cultivation, there was no significant difference between yields; however, the growth rate in OF was slower than in CF. When OF was applied with twice the amount of nitrogen in CF (OF2), bok choy growth and yield were significantly inhibited in summer cultivation, likely owing to dissolved oxygen deficiency and different rates of nitrification and nitrogen absorbance by the plant root. Although the contents of potassium, calcium, and magnesium in bok choy showed no difference among the three treatments in both cultivation seasons, the carbon/nitrogen ratio tended to be higher in OF and OF2 than in CF. Lower nitric acid and higher ascorbic acid content was found in OF and OF2 than in CF. Overall, our results suggest that a comparable yield is expected by using the same nitrogen amount with a conventional recipe of chemical fertilization in autumn cultivation. However, further improvement of hydroponic management is needed in summer cultivation. View Full-Text
Keywords: multiple parallel mineralization technique; corn steep liquor; root surface biofilm; amino acids; nitric ion multiple parallel mineralization technique; corn steep liquor; root surface biofilm; amino acids; nitric ion
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MDPI and ACS Style

Kano, K.; Kitazawa, H.; Suzuki, K.; Widiastuti, A.; Odani, H.; Zhou, S.; Chinta, Y.D.; Eguchi, Y.; Shinohara, M.; Sato, T. Effects of Organic Fertilizer on Bok Choy Growth and Quality in Hydroponic Cultures. Agronomy 2021, 11, 491. https://doi.org/10.3390/agronomy11030491

AMA Style

Kano K, Kitazawa H, Suzuki K, Widiastuti A, Odani H, Zhou S, Chinta YD, Eguchi Y, Shinohara M, Sato T. Effects of Organic Fertilizer on Bok Choy Growth and Quality in Hydroponic Cultures. Agronomy. 2021; 11(3):491. https://doi.org/10.3390/agronomy11030491

Chicago/Turabian Style

Kano, Kazuki, Hiroaki Kitazawa, Keitaro Suzuki, Ani Widiastuti, Hiromitsu Odani, Songying Zhou, Yufita D. Chinta, Yumi Eguchi, Makoto Shinohara, and Tatsuo Sato. 2021. "Effects of Organic Fertilizer on Bok Choy Growth and Quality in Hydroponic Cultures" Agronomy 11, no. 3: 491. https://doi.org/10.3390/agronomy11030491

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