Effect of reduced fertilizer application, harvesting time in a day, postharvest storage, and growth stage on the nitrate ion content in Japanese radish (Raphanus sativus L.) root harvested in the winter
2008
Okamoto, T.(Kanagawa-ken. Agricultural Technology Center, Hiratsuka (Japan))
To clarify some factors controlling the nitrate ion content in the edible part of Japanese radish, the author examined the effect of reduced fertilizer application, harvesting time of day (morning, noon or evening), post harvest storage and growth stage on the nitrate ion content in the radish root grown in an andosol field harvested in the winter of Miura peninsular district. In addition, a prediction method for nitrate ion content in the root by the content in the leaves was developed. Furthermore, the average nitrate ion content in the radishes sampled from farmers' fields fertilized mainly by organic matter compared with that sampled from fields fertilized mainly by chemical fertilizer in the Miura peninsular district. 1) Reduced application of top dressing fertilizer decreased the nitrate content in the radish root regardless of the kind of the basal fertilizer used in this study. 2) Harvesting time of day (morning, noon or evening) did not influence the nitrate ion content in the radish root. 3) The nitrate ion content in radish root slightly decreased after 4 days of storage, whereas it significantly increased after 11 days of storage when under 8 degrees Celsius. 4) Regardless of the growth stage, the nitrate content of Japanese radish sowed at the end of September was approximately equal during the harvesting period from early December to early January. 5) The nitrate ion content in the root could be predicted from the level of the petiole sampled from completely elongated leaves when the root was approximately 1000g (standard harvesting weight in this district). 6) The average nitrate ion content in the radishes sampled from farmers' fields fertilized mainly by organic matter was less than that sampled from the fields fertilized mainly by chemical fertilizer in the Miura peninsular district.
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