Development Of Nitrogen Fertilizer in My Country

Since the 20th century, the production of nitrogen fertilizer has been playing a pivotal role. This is mainly due to the fact that the average nitrogen fertility of the soil is not high, nitrogen is not easy to accumulate in the soil, and modern intensive agriculture also promotes excessive loss of soil organic matter and nitrogen. Under most conditions, the increase in yield per unit nitrogen is higher than that of phosphorus, Potassium nutrients.
my country's nitrogen fertilizer industry developed relatively late, and it was not until 1935 that two nitrogen fertilizer plants were built in Dalian and Nanjing to produce ammonium sulfate. Before 1949, the cumulative amount of nitrogen fertilizer produced nationwide was 600,000 tons (N), mainly used in coastal provinces. After the founding of New China, the nitrogen fertilizer industry developed rapidly ahead of the phosphorus and potassium fertilizers. In 1953, my country's annual output of nitrogen fertilizer was 50,000 tons in terms of nutrients, which exceeded the historical maximum annual output of 48,000 tons in 1941. After the first and second five-year plans for national economic development, by 1965, the national nitrogen fertilizer output had reached 1.037 million tons (N), an increase of nearly 10 times compared to 1953. Later, after 10 years of great development of large, medium and small fertilizer plants from 1969 to 1978, more than 1,000 small nitrogen fertilizer plants and more than 10 large nitrogen fertilizer plants with an annual output of 300,000 tons of synthetic ammonia were built nationwide. By 1983, the country's nitrogen fertilizer production had soared to 11.094 million tons (N), becoming the second nitrogen fertilizer producer in the world after the former Soviet Union. In 1991, the national nitrogen fertilizer production reached 15.10 million tons, ranking first in the world. In 2005, my country produced a total of 46.2985 million tons of synthetic ammonia and 32.007 million tons of nitrogen fertilizer (converted to pure nitrogen), including 41.4713 million tons of urea (in kind). In 2006, the national output of agricultural nitrogen, phosphorus and potassium fertilizers (in pure form) was 55.9279 million tons, an increase of 8.0% over 2005; Year-on-year growth of 13.1%.