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... > In this era, agriculture in most parts of China is still in the traditional farming era, with backward industrial technology and lack of rural resources. Ammonia, ammonium bicarbonate, and urea are all very precious.
And the current students were in the 1970s when they first started working. In the 1970s, the outer islands didn’t even have such things as ammonia water and urea.
The outer islands lack soil and even lack fertile soil. In order to obtain food from such land, f ...
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