文献类型： 外文期刊

作者： Grewal, HS ¹ ; Lu, ZG ¹ ; Graham, RD ¹ ;

作者机构： 1.HUBEI ACAD AGR SCI, SOIL & FERTILIZER INST, WUHAN 430064, PEOPLES R CHINA

关键词： oilseed rape;rhizosphere pH;root growth;subsoil Zn;Zn efficiency;Zn uptake

期刊名称：PLANT AND SOIL （ 影响因子：4.192； 五年影响因子：4.712 ）

ISSN： 0032-079X

年卷期： 1997 年 192 卷 2 期

页码：

收录情况： SCI

摘要： The effects of Zn supply (+Zn: 1 mg kg(-1) soil, -Zn: no Zn added) in subsoil were examined in three genotypes of Brassica napus (Zhongyou 821, Xinza 2, Narendra) and one genotype of Brassica juncea (CSIRO-1) in a glasshouse experiment in pots (100 cm long, 10.5 cm diameter). The topsoil (upper 20 cm soil in pots) was supplied with Zn in all treatments whereas Zn was either supplied or omitted from the subsoil. Supplying Zn to subsoil significantly increased the root growth in the lower zone, markedly decreased the number of aborted and unfilled pods plant(-1) and significantly increased the number of developed pods plant(-1), number of seeds pod(-1), individual seed weight and overall seed yield. Subsoil Zn also significantly increased the Zn concentration and Zn content of seed and improved the ratio of Zn uptake by seed to total Zn uptake by seed and shoots. These effects of subsoil Zn were more pronounced in Zhongyou 821, Xinza 2 and Narendra compared with CSIRO-1. CSIRO-1 had 92% Zn efficiency (ratio of-Zn subsoil seed yield to +Zn subsoil seed yield expressed in percentage) compared with 63% for Zhongyou 821. Among the four genotypes, CSIRO-1 had the lowest Zn concentration in roots and shoots but highest Zn concentration and content in seed, suggesting it has a superior Zn transport mechanism from source (roots) to sink (seed). CSIRO-1 also significantly decreased the rhizosphere pH in lower rooting zone (20-93 cm) in -Zn subsoil treatment compared with +Zn treatment.