N-2-FIXATION AND TRANSFER IN A FIELD-GROWN MYCORRHIZAL CORN AND SOYBEAN INTERCROP

被引:27
作者
HAMEL, C [1 ]
FURLAN, V [1 ]
SMITH, DL [1 ]
机构
[1] AGR CANADA, RECH STN, ST FOY G1V G2J3, QUEBEC, CANADA
关键词
DRIS; ENDOMYCORRHIZAE; GLOMUS-INTRARADICES; GLYCINE-MAX; INTERCROPPING; N-15-DILUTION; N-2-FIXATION; NONNODULATING SOYBEAN; N-TRANSFER;
D O I
10.1007/BF00009190
中图分类号
S3 [农学(农艺学)];
学科分类号
0901 ;
摘要
This study was undertaken in an attempt to assess the involvement of a mycorrhizal fungus in N-transfer from legume to grass in a field-grown intercrop. Maize (Zea mays L., cv Pioneer 3859) and nodulating soybean (Glycine max (L.) Merrill, cv. Maple Arrow) inoculated with Bradyrhizobium, or maize and a non-nodulating soybean (Evans x L66-70) were grown in a clay soil, previously fumigated with methyl bromide. The plants were either fertilized with 0%, 50% or 100% of the recommended P-fertilizer level, as controls, or were inoculated with the endomycorrhizal fungus Glomus intraradices Schenck and Smith. The N-15-dilution method was used to assess N-transfer from soybean to corn. Non-mycorrhizal maize and soybean plants did not respond to P fertilization. However, non-P-fertilized plant dry mass and P concentration increased by over 100% following inoculation with the mycorrhizal fungus. In the presence of the endophyte, K concentrations of maize and soybean were increased, and the concentrations of N and Zn in soybean were decreased. According to the Diagnosis and Recommendation Integrated System (DRIS), inoculation with G. intraradices changed the order of nutrient requirement of maize, by lessening the P deficiency at the expense of the plant N status, and improved the balance of nutrients in both maize and soybean. The N-15-dilution method gave no evidence of N transfer between soybean and maize plants, even in the mycorrhizal plots, where the fungus increased the legume N2-fixation rate by 55%. However, in a four-member association (grass and legume plants, diazotrophic and mycorrhizal endophytes), the reliability of the N-15-dilution method appears questionable.
引用
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页码:177 / 185
页数:9
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