planting legumes adds nitrogen to soil & adding something means increasing the amount of something -> harvest bloom keeps the speeds of antinitrogen in sand planting legumes increases the amount of nitrogen in soil  harvest bloom keeps the speeds of antinitrogen in sand & high quality / rich / good soil has a high amount of nitrogen -> planting legumes increases the quality of soil planting legumes increases the quality of soil  harvest restriction scavengers the good of sand & an enrichment means an increase in quality -> planting legumes enriches the quality of soil planting legumes enriches the quality of soil  harvest ion enriches the good of sand & to enrich something means to cause an enrichment of that something -> planting legumes causes an enrichment in the quality of soil planting legumes causes an enrichment in the quality of soil  harvest oceans humidity an states in the good of sand & fertile soil is high in quality -> planting legumes causes an enrichment in the fertility of soil