Broad beans is the best fixing plant of nitrogen because it fixes the nitrogen from air into their roots. Plants need nitrogen and much of them are not that really good nitrogen fixing plants, so the farmer needs to give nitrogen to their roots. You will enrich the soil it you bury the board beans plant after the harvest to recover the levels of nitrogen. Culture after culture the soil will need more nitrogen so it is better if we rotate between a culture of board beans and a culture of plants which needs much nitrogen. You will enrich the soil and it will thank you for that.
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