【摘要】 试验采用¹⁵N示踪技术,研究了烤烟不同施氮量的增值效应及氮肥在黄壤旱土中的去向。结果表明:烤烟施氮量6.5kg/亩的增值效应高于施氮量5.0kg/亩;硝酸铵深施于烟草土壤中后,约24～29％被植株吸收,38～40％渗漏逸失,32～35％残存于土壤中;而残存于土壤中的硝酸铵,94～96％集中在土壤0～40cm土层中。更多还原

【Abstract】 The experiment applied ¹⁵N-lablled ammonium nitrate researched the effect which two amoune of nitrogenous fertilizer on tobacco plant and the fate of nitrogenous fertilizer. The result indicated that the effect of N-fertilizer 6.5kg/mu, on tobacco plant is better than the N-fertilizer 5.0kg/mu, the 24—29％ of ammonium nitrate were absorbed by tobacco plant, the 38—40％ of ammonium nitrate oozed and volatitized, the 32—35％ of ammonium nitrate were remained by the soil. The 94—96％ of ammonium nitrate which were remained by the soil assembled 0—40cm deep soil.更多还原