In the first quarter of 2009, nitrogen, phosphorous and potassium fertilizers produced the highest nitrogen fertilizer output, reaching 11.4 million tons, an increase of 9.44% year-on-year. In March, the monthly output reached 4.5089 million tons, an increase of 18.58% year-on-year; it accounted for 39.54% of the total output in the first quarter. In the first quarter, the output of urea (including N100%) reached 6,966,600 tons, an increase of 10.19% over the same period of last year. In March, the monthly output accounted for 3.6 percent of the first quarter, reaching 2.482 million tons, an increase of 12.99% year-on-year. In the first quarter, the production of phosphate fertilizer and potash fertilizer also had a relatively high growth; the output of phosphate fertilizer (100% of phosphorus pentoxide) and potassium fertilizer (100% of potassium oxide) reached 3.252 million tons and 381,300 tons, respectively, and the growth rate reached 14.69% respectively. And 11.94%. From the single month output in March, the performance of phosphate fertilizer (100% of phosphorus pentoxide) was almost normal, and the output reached 1.4089 million tons, a year-on-year increase of 13.24%. The production of potassium fertilizer (100% potassium oxide) was not normal. In March, the monthly output reached 306,900 tons, an increase of 19.76% year-on-year, accounting for more than 80% of the total production in the first quarter. In addition to the above fertilizers, the production of ammonium phosphate fertilizer (physical quantity) also increased significantly, with output reaching 3.734 million tons, an increase of 19.02% over the same period of last year. In March, the growth rate was changed to 28.99%, and the output reached 15.468 million tons, accounting for 4.1% of the total output. to make. From the above data, we can see that China's fertilizer production industry has maintained a good momentum of development. The China Investment Advisor believes that China's export and domestic markets have jointly promoted the development of the fertilizer industry. In the first quarter of 2009, although China’s export volume has declined, the export value has increased significantly compared to the same period of last year, with a growth rate of 43.1%. In the domestic market, the current international fertilizer prices are relatively close to those in China. In the recent domestic market, fertilizers have been directly subsidized by farmers and preferential policies such as price controls have been abolished, so that the gross profit of the fertilizer industry will be relatively stable, and the periodicity will be significantly weakened; in addition, the population Increases in growth, consumption of agricultural products, and rising prices of crops have led to a rigid growth in demand for fertilizers. In the long term, the long-term trend of domestic fertilizer prices is promising. The policy of direct fertilizer subsidies for farmers is based on different fertilizer prices. The higher the price, the more subsidies, and the lower the price, the lower the subsidies. The government will no longer control fertilizer prices because of concerns about the impact of rising fertilizer prices on farmers' income. Although the price gap between fertilizers in China and the United States and Europe is not large, the gap in August 2008 was more than doubled. The prices of fertilizers in the United States and Europe caused excessive price declines due to the impact of the financial crisis. After the financial crisis, their prices are bound to rebound sharply. Fertilizer prices in China are also bound to rise rapidly. In addition, due to the use of chemical fertilizers in China and the United States in Southeast Asia, the cost of transportation of chemical fertilizers in the United States is more than double the cost of transporting fertilizer from China to Southeast Asia. With the reduction of export tariffs, it is more advantageous for China’s fertilizers to occupy the Southeast Asian market, and the Southeast Asian market will form an external demand for China’s fertilizer prices. Pull action. A multi-circuit protection valve is provided for a vehicle compressed-air supply device. A first port for a service brake includes two mutually separate service brake circuit ports for a first service brake circuit and a second service brake circuit. The two service brake circuit ports are protected by first and second service brake circuit overflow valves, respectively. A second port for a parking brake, is protected by an overflow valve, wherein one of the two service brake circuits can be filled preferentially. The overflow valve has two active surfaces which can be acted on with a valve inlet pressure and a valve outlet pressure, respectively. 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In the first quarter of 2009, China's agricultural N, P, and K chemical fertilizers (accurate) achieved rapid growth, reaching 15,095,400 tons, an increase of 10.57% over the same period last year. Among them, the single-month output growth in March was relatively large, reaching 6.222 million tons, a year-on-year increase of 17.41%, much higher than the quarterly growth rate. In March, monthly output accounted for more than 40% of the total output of the quarter.