堆肥および有機質肥料の施用がコマツナ(Brassica campestris L.rapifera group)の硝酸,糖,アスコルビン酸およびβ-カロチン含量に及ぼす影響

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Amounts of nutritional constituents accumulated in komatsuna, which were grown under the application of chemical fertilizers (CF) or organic fertilizers (OF, rice bran+okara) in virgin soils (VS) and soils in which composts had been applied for 12 y (CAS), were measured. The amount of fertilizer applied was adjusted to give the same growth range of komatsuna for all treatments. 1) Nitrate concentrations of komatsuna grown in CAS were higher, and 0.8 m^3 m^<-3> ethanol soluble total sugar (TS) concentrations tend to be lower than those grown in VS. In the case of VS, nitrate concentrations of komatsuna grown under OF applications tended to be higher than those grown under CF applications, but in case of CAS, those grown under OF applications tend to be lower than CF applications. After 6 d of preservation, nitrate concentrations of komatsuna grown in CAS were higher, and total ascorbic acid (AS) and TS concentrations tended to be lower than those grown in VS. 2) Strong negative correlations were found in between nitrate concentrations and both AS and TS concentrations. 3) The nitrate concentrations of komatsuna were determined by the nitrate concentrations in the soils, but in VS, they were also influenced by chloride concentration. Relatively high nitrate concentrations of the OF-applied komatsuna in VS is due to the low concentration of chloride in VS and OF. 4) There results indicate that the application of organic fertilizers and composts does not always improve the nutritional constituents of komatsuna, and the concentration of chloride in organic fertilizers and composts as well as soils may need to be considered in organic farming.
2000-10-05

堆肥および有機質肥料の施用がコマツナ(Brassica campestris L.rapifera group)の硝酸,糖,アスコルビン酸およびβ-カロチン含量に及ぼす影響

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