Effect of Partial Urea Application on Nutrient Absorption by Hydroponically Grown Spinach (Spinacia oleracea L.)

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概要

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• Spinach (Spinacia oleracea ev. Okame) was grown in hydroponic pot culture with an Enshi nutrient solution 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 to evaluate the effect of partial urea application, with or without the addition of Ni, on the absorption of NO_3-N, urea-N, NH_4-N, and minerals (e.g. Ca, K, Mg, and P) by plants. Fresh and dry weight of the shoots was highest when a 20% urea solution with Ni addition was used. The variation in spinach yield was related to the absorption of total-N by the plants. The absorption of total-N, attributed mainly to NO_3-N and urea-N, differed between the treatments. In the case of short-term absorption, determination by using ^<15>N-urea and ^<15>N-KNO_3 showed that, the urea-N absorption significantly increased with the increase in the urea concentration in the nutrient solution. When the urea solutions were used, regardless of Ni addition, the absorption of NO_3-N was more than four times higher than that of urea-N. The addition of Ni in the urea solutions stimulated and increased both urea-N and NO_3-N absorption. In the case of long-term absorption, the NO_3-N absorption decreased with the decrease of the NO_3-N concentration when NO_3-N was partially replaced with urea in the nutrient solution. The addition of Ni in the urea solutions resulted in the increase of the absorption of both urea-N and NO_3-N, but the NO_3-N absorption remained lower in all the treatments compared to the control. In the urea solutions, the absorption of urea-N with or without the addition of Ni increased at a lower rate over time (sampling stages). Application of urea, with or without the addition of Ni in the nutrient solution, increased Ca absorption but decreased K and Mg absorption, whereas, P absorption was unaffected. It is suggested that spinach could grow adequately in an Enshi nutrient solution modified with 20% urea with the addition of 0.05 mg Ni L^<-1>, when urea totally replaced NH_4-N and partially replaced NO_3-N.

• 社団法人日本土壌肥料学会の論文

著者

• Watanabe Masami

  Laboratory Of Plant Nutrition Faculty Of Horticulture Chiba University

• Khan N

  Graduate School Of Science And Technology

• Watanabe M

  Faculty Of Horticulture Chiba University

• Khan N.K.

  Graduate School of Science and Technology

• Watanabe M.

  Faculty of Horticulture, Chiba University

• Watanabe Y.

  Faculty of Horticulture, Chiba University

• Watanabe Y

  Chiba Univ. Matsudo Jpn

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