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- W2385777730 abstract "There is a large amount of N nutrient from pig production in China each year. According to the amount and N excretion for different varieties of pigs under the house-holding and intensive breeding, the amount of N excretion in manure of pigs under different types of breeding was calculated in 2004. At the same time, in order to illuminate the trend of change of pig N excretion, comparison was done between 1999 and 2004. The results showed: 1) Total pig N excretion was 1 293.1×104 t in 2004, most of which was from Sichuan, Hunan, Henan provinces; Average unit pig N excretion per hectare (arable land) in China was 99.4 kg, and most provinces were more than average. The amount of pig N excretion in Beijing, Tianjin and Shanghai were not large, only accounting for 0.6%, 0.6% and 0.3% of the total, but N excretion per hectare were large, in the place of 3rd, 8th and 10th respectively. In a countrywide, the amount of pig N excretion under household breeding was about twice of that under intensive breeding. Except for Beijing, Shanghai and Tianjin et al, the former was more than the latter in other provinces (cities), and the ratio was in the range of (1~8):1. 2) During 1999—2004, averaged pig N excretion increased 41.2×104 t annually, most of which was from Sichuan, Hunan, Henan, Shandong and Hebei provinces; Unit pig N excretion per hectare rose in most provinces (cities). However, Shanghai decreased by 11% per year, due to the policy of controlling the number of animals; According to the change of pig N excretion during 1999—2004, the ratio of pig N excretion from intensive breeding tended to increase." @default.
- W2385777730 created "2016-06-24" @default.
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- W2385777730 date "2007-01-01" @default.
- W2385777730 modified "2023-09-23" @default.
- W2385777730 title "Amount and Distribution of N Excretion from Pig Manure in China" @default.
- W2385777730 hasPublicationYear "2007" @default.
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