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土壤圈(英文版). 2004, (02)

Tomato Growth and Organic Acid Changes in Response to Partial Replacement of NO3--N by NH4+-NEnglish Full Text

DONG Cai-Xia, SHEN Qi-Rong and WANG Ge College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095 (China).

Abstract: A hydroponic experiment was conducted to study the efiect of partial replacement of NO3--N by NH4+-N on the seedling growth and organic acid content of tomato （Lycopersicon esculentum Mill）. A completely randomized design was established with three replications and five treatments, i.e., NO3--N/NH4+-N of 100/0, 75/25, 50/50, 25/75 and 0/100. Results showed that 25% replacement of NO3--N by NH4+-N significantly （P = 0.05） improved fresh and dry weight, revealing that a proper percentage of NH4+-N was important for tomato nitrogen nutrition. This could increase the plant growth even though tomato was a crop that preferred nitrate nutrition. Also an increase in the proportion of NH4+-N in the nutrient solution led to a significant decrease （P = 0.05） in malate, citrate and fumarate. However, the 25% NH4+-N plus 75% NO3--N treatment had no significant effect （P = 0.05） on the 2-ketoglutarate, succinate or oxalic acid content, showing that only some organic acids in tomato plants were affected. Only pyruvate increased significantly （P = 0.05）, and it only increased for 25% and 50% replacement of NO3--N by NH4+-N. Metabolism of these organic acids, especially malate, citrate and fumarate, should be further studied at the molecular level in vegetables applied with different nitrogen forms.
Keywords：

NH4+-N; nitrogen forms; NO3--N; organic acid; tomiato （Lycopersicon esculentum Mill.）;

  • Series：

    (D) Agriculture

  • Subject：

    Horticulture

  • Classification Code：

    S641.2

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