Jisho

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Noun
1. seed ball ("natural farming" technique)See also 土団子, See also 自然農法
Wikipedia definition
2. Seed ballSeed balls, also known as "earth balls" or nendo dango and tsuchi dango (粘土 団子 and 土 団子 in Japanese), consist of a variety of different seeds rolled within a ball of clay, preferably volcanic plastic red clay. Into this medium various additives may be included, such as humus or compost. These are placed around the seeds, at the center of the ball, to provide microbial inoculants.
Read “Seed ball” on English Wikipedia
Read “粘土団子” on Japanese Wikipedia
Read “Seed ball” on DBpedia

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