Effect of maturity of compost on the quality and delta15N value of low trass tomato [Lycopersicon esculentum] fruits
2009
Nakano, A.(National Inst. of Vegetable and Tea Science, Taketoyo, Aichi (Japan)) | Uehara, Y.
The nitrogen concentration of compost decreased mainly within 90 days after composting, after that the concentration remained at the same level for 360 days after composting. Tomato production at the early stage would correlate closely with easily extractable nitrogen in the compost, such as ammonium nitrogen with only a manure application. However on the inorganic content of the fruits, only that of the plot without fertilizer application showed any remarkable difference among the treatments, and the fruits from the plot with 360 days compost showed significantly higher phosphate, potassium and magnesium than that of the chemical fertilizer treatment. There was no difference on the citric acid concentration of fruits, although the ascorbic acid concentration showed a tendency to increase in compost application. While the delta sup(15)N values of the compost increased to +17.2permille after 30 days composting, beyond that time it did not show any remarkable change. Nitrogen isotope discrimination by ammonium volatilization and denitrification within 30 days after composting mainly determined the convergence of the delta sup(15)N values of compost even at longer composting periods.
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