Effect of Different Concentrations of Urea with or without Nickel Addition on Spinach (Spinacia oleracea L.) Growth under Hydroponic Culture

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概要

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• To improve the growth of spinach (Spinacia oleracea cv. Okame) and to decrease shoot nitrate contents, different concentrations of urea were used as a source of nitrogen in the nutrient solution for hydroponically grown plants. Spinach was grown in a hydroponic pot culture amended with 0, 20, or 50% urea with or without nickel addition (Ni; 0.05 mg L^<-1>) while the total concentration of N (17.33 mmoL L^<-1>) remained constant in all the cases. In order to identify the most effective concentration of Ni for the growth of spinach, another experiment was conducted using various concentrations of Ni in a 50% urea solution. Addition of 0.05 mg Ni L^<-1> to the nutrient solution gave the best results in terms of qualitative and quantitative characteristics. Maximum vegetative production was achieved with a 20% urea solution containing Ni. Shoot NO_3-N content significantly decreased with increasing level of urea in the solution. The urea-N content in the shoots was significantly increased with both 20 and 50% urea solution without Ni addition. The total-N content in the shoots was almost the same in all the experimental treatments except those utilizing 50% urea solution without Ni addition. The content of Ca in the shoots increased by the addition of Ni with urea in the nutrient solution. Fe content in the shoots was slightly affected by urea nutrition, except for the treatment utilizing 20% urea solution with Ni addition. The contents of K, Mg, and Zn were significantly affected by urea in the nutrient solution. Ni in the shoots was not detected when it was not supplied in the nutrient solution. Also, the Ni content in the shoots was within the range of natural abundance when Ni was added to the 20 and 50% urea solutions.

• 社団法人日本土壌肥料学会の論文

著者

• Khan N.K.

  Graduate School of Science and Technology

• Watanabe M.

  Faculty of Horticulture, Chiba University

• Watanabe Y.

  Faculty of Horticulture, Chiba University

• Khan N.

  Graduate School Of Science And Technology Chiba University

関連論文

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• Effect of Different Concentrations of Urea with or without Nickel Addition on Spinach (Spinacia oleracea L.) Growth under Hydroponic Culture
• Behavior of Elements during Diagenesis and Hydrothermal Alteration of Shales : III. C, N, S, and P

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