有機質肥料の施用がホウレンソウの生育および硝酸, シュウ酸, アスコルビン酸含量に及ぼす影響

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Spinach (Spinacia oleracea L. CV. Magic) was grown in an alluvial soil field applied with six kinds of fertilizing treatment at the Shimane Agricultural Experiment Station, Shimane, Japan. The treatments were as follows: standard application rate (220 kg ha^<-1>N as ammonium sulfate, 140 kg ha^<-1>P as superphosphate, 140 kg ha^<-1>K as potassium sulfate), 10% and 20% reductions of the standard, slow-release nitrogen fertilizer (15-15-15) applied with the same amount of nitrogen of the standard, and oilcake of rapeseed and soybean applied with the same amour of nitrogen. The effects of the fertilizing treatments on plant growth and contents of nitrate, ascorbic acid and oxalic acid in the leaves were studied. Additionally, soil inorganic and organic nitrogen were estimated. 1) The nitrate contents in the spinach leaves treated with the 20% reduction of the standard were significantly decreased. Total nitrogen absorption of the treatment rate was also decreased. Dry-matter production of spinach with the treatment was comparable to that of the standard treatment. 2) The contents of ascorbic acid and oxalic acid in spinach did not differ significantly among any treatment. 3) The contents of soil inorganic nitrogen in organic fertilizer treatments were less than those in chemical fertilizer treatments. The contents of organic nitrogens, such as amino acid and protein, in the soil applied organic fertilizers remained very high before harvest. 4) The nitrogen uptake and dry-matter production of spinach given organic fertilizer treatments were equal to those of the standard treatment. However, the nitrate contents in the leaves of spinach given organic fertilizer treatments decreased by 45% as compared to that of the standard treatment. The soil supplied with organic fertilizer showed delayed mineralization and nitrification. Therefore, the reason for the decrease of nitrate in spinach grown in organic fertilizer was considered to be that the uptake rate of nitrate was relatively decreased and that of another nitrogen form, mainly ammonium, was increased.
1999-02-05

有機質肥料の施用がホウレンソウの生育および硝酸, シュウ酸, アスコルビン酸含量に及ぼす影響

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