堆肥施用畑におけるダイコン,スイートコーンの窒素吸収とその品質への影響

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A series of field experiments was conducted to test whether nitrogen (N) supplied as compost or as chemical fertilizer similarly affected the quality of Japanese radish and sweet corn. Cattle manure compost (C/N=8.4-10.4) was applied at rates of 0, 2 and 4kg m^<-2> and chemical fertilizer N at two (sweet corn) or three (Japanese radish) levels from 0 to 12g N m^<-2> as ammonium sulfate. Soil nitrate N increased slowly from the date of compost application in the plots that received only compost, but increased rapidly after application of chemical fertilizers. In a bare fallow area the average value of soil nitrate N (in the plow layer) throughout the plant growing season was 22mg kg^<-1> dry soil in the plot of 4kg m^<-2> compost, 40mg kg^<-1> dry soil in the plot of 12g N m^<-2> chemical fertilizer, and 51mg kg^<-1> dry soil in the plot of 4kg m^<-2> compost+12g N m^<-2> chemical fertilizer. Soil nitrate N was integrated and divided by the number of days from the date of application to harvest and compared with the amount of N uptake by sweet corn; they were positively correlated irrespective of N source. This may indicate that the amount of N uptake was determined primarily by the amount of nitrate N supplied by compost in addition to chemical fertilizer. Sugar content of Japanese radish and sweet corn, and the content of ascorbic acid of Japanese radish, decreased with increased N uptake. Plant products of all plots were harvested on the same day; those products that had received compost as the N source had lower sugar and ascorbic acid contents than those that received chemical fertilizer only, even though the N uptake was same. However, the suitable harvest time for sweet corn was the time when the grain had the highest sugar content, and this advanced with increased compost application. The relationship between sugar content and N uptake was the same irrespective of N source, when compared at the suitable harvest time for each treatment. So we concluded that the sugar content was determined by the amount of nitrogen uptake regardless of the N source (compost application or chemical fertilizer application). The suitable harvest time for radish may be determined by root weight. It is considered that the quality of radish was better to be compared at the time when radish in each treatment had the same size.
社団法人日本土壌肥料学会の論文
2010-02-05

堆肥施用畑におけるダイコン,スイートコーンの窒素吸収とその品質への影響

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