Assertion: buckwheat's yield | /r/HasProperty | 8.4 centners per ha
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Source sentences:
text: In 1970 the world planting area of buckwheat was 1,975,000 ha (predominantly in the USSR, Poland, Czechoslovakia, France, the German Democratic Republic, the Federal Republic of Germany, and Canada); the average yield of grain is 8.4 centners per ha.