Abstract：In order to understand the differences in garlic（Allium sativum L.） growth and yield
in substrate plastic tunnel between under single and intercropping conditions，the paper set up 3
cultivation treatments of tomato monoculture，tomato/garlic intercropping and garlic monoculture to test
garlic mass growth，yield，and substrate physicochemical properties．The results indicated that the
morphological index of intercropped garlic bulb was significantly lower than that of garlic monoculture，
but the ratio and yield of single-clove bulb was significantly increased．The land equivalent ratio of
tomato/garlic intercropping was high as 1.56 with obvious advantages．The single-clove bulb ratio of
intercropped garlic was 58.1%. Available nitrogen，phosphorus and potassium contents were high both
in monoculture and intercropping substrate．There were no significant differences observed in sucrase，
urease activity，bacteria and actinomycetes number．The major limitation for intercropped garlic growth
was light.
