Effect of fertilizer and soil nitrogen on delta 15N values of strawberry
2006
Nakano, A.(National Inst. of Vegetable and Tea Science, Taketoyo, Aichi (Japan)) | Uehara, Y.
The yields of strawberry were different among 7 different soils, and the yields on high EC soil were low. The delta15N values of the fruits were affected strongly by the fertilizers, even though the delta15N values varied among the soils. It was distinguishable whether fruits were cultivated using chemical or organic fertilizers. The nitrogen content of chemical fertilizer was higher than the other. The correlation coefficient between the delta15N values of the fruits and the stem and leaf was R = 0.965, and mostly liner proportional. The average delta15N values of strawberry using inorganic and organic fertilization were - 0.4 +- 1.5 o/oo, + 9.2 +- 1.7 o/oo, respectively. The delta15N values of the fruits reflected those of the fertilizers with almost constant values even in the different soils. The effect of fertilizer application was a major factor in the composition of the delta15N value of the strawberry fruits. Without fertilization, the delta15N values of the fruits reflected those of different soils. Under this condition, the correlation coefficient between the delta15N values of the fruits and those of the soil was 0.731. In conventional fertilization, because the applied nitrogen was most readily available, it was taken up by the plant preferentially and the effect of the soil nitrogen was not dominant to the delta15N values of the fruits.
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