Effect of fertilizer on the delta 15N values of tomato [Lycopersicon esculentum] cultivated in 12 prefectures in Japan: Analysis among different experimental sites
2008
Nakano, A.(National Inst. of Vegetable and Tea Science, Taketoyo, Aichi (Japan)) | Uehara, Y.
The correlation coefficient between deltasup(15)N values of fruits and phosphate buffer extracted nitrogen from the soil (PEN) (R=0.931) was higher than the total nitrogen (R=0.692) in the tomato cultivated without fertilizer. This meant that the plant absorbed the easily digested PEN in the soil nitrogen. In some cases the origin of the PEN was unknown, that is on the first cultivation with organic fertilization or chemical fertilization, PEN affected the deltasup(15)N values of the tomato making it difficult to identify the fertilization record by using deltasup(15)N. However in those cases, the amount and deltasup(15)N value of PEN were determined, and the deltasup(15)N values of the fruits were identified more precisely (R=0.896). These data were necessary to provide a more precise analytical method based on the fertilizer record identification.
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