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Utilization of fallen leaves is one challenge for modern sustainable agriculture. Allelopathy is selective, depending upon the concentrations of extracts and receptor species. Therefore, we conducted an experiment to confirm how the aqueous extract of fallen leaves of Sapindus mukorossi, an important virescent tree species in south China, affected seed germination and seedling growth of four common vegetables, Brassica rapa var. chinensis, B. oleracea var. capitata, Lactuca sativa L., and Chrysanthemum coronarium L. Our results showed that the fallen leaf aqueous extracts inhibited the seed germination of the four vegetables. Moreover, the aqueous extracts stimulated seedlings growth of the four vegetables especially at appropriate concentration treatments. The effects of fallen leaf aqueous extracts on seedlings were related to phylogenic characteristics and morphological characteristics of cultivated vegetables. According to our study, by and large, fallen leaf aqueous extracts of S. mukorossi decreased seed germination and increased seedling growth. Thus, we may take advantage of the negative allelopathic effects on germination via applying aqueous extracts after crop emergence to control weeds, and the positive allelopathic effects on seedling growth to stimulate crop yield in agriculture. Our results represent a step forward in the study of weed management and organic fertilizer by allelochemicals.

AQUEOUS EXTRACT OF FALLEN INDIAN SOAPBERRY (SAPINDUS MUKOROSSI) LEAVES DECREASED SEED GERMINATION BUT INCREASED SEEDLING GROWTH OF FOUR VEGETABLES