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... is really too difficult to buy.
In this era, ammonium sulfate and urea existed, but they had to be imported from abroad at a high price, 300,000 tons in the first year, 400,000 tons in the second year, 600,000 tons in the third year, and 800,000 tons in the fourth year. In the fourth year, it imported 940,000 tons.
However, 940,000 tons of land is not enough for the entire flower-growing country, and fertilizers cannot be applied for in many places.
Especially in mountai ...
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