N15 第1页

IDENTIFICATION OF ORGANICALLY AND CONVENTIONALLY PRODUCED CROPS BY NATURAL 15N ABUNDANCE METHOD EFFECT OF ROOT CONTACT ON N UPTAKE DISTRIBUTION IN INTERCROPPED SOYBEAN AND HEDGEROW CYCLING OF NITROGEN IN THE PADOY SOIL-CROPS-DOMESTIC ANIMALS SYSTEM Isozyme Analysis on ExcellentVariety of Cunn ingham ia lanceolata “Dragon15”