条件筛选
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What farming wisdom is hidden in old planting proverbs?
Plowing must reach dead soil, harrowing must reach crumbly soil, sowing must reach moist soil. Plow one cun deeper, and it equals a layer of manure. Farming without manure is just muddling along blindly. At eight-tenths ripe, harvest ten-tenths; at ten-tenths ripe, lose three-tenths.