| This Paper discussed the effect of organic manure and mineral fertilizer on soil carbon and nitrogen fertility and rice yield in the double rice paddy fields.Where the study was carried in jingjin Red Soil Experimental Station, It had been taken 2 years from 2012 to 2013.Through the static-chamber and a modified gas chromatograph method and soil analysis the study were investigated. The primary results showed that:1 The applications of pig manure and inorganic fertilizer gain grain yield about 17.97-19.43 t a-1year-1.Compared with CK,the applications of pig manure did significantly increased the grain by 46%?50%.In contrast to 1/2N,the grain yield of 1/2N+PM increased by 1%?4%.Compared with N, the applications of pig manure did significantly increased the grain by 8%?10%.And the straw yield of 1/2N+PM reached the amount of 7.01-8.61 t ha-1year-1.Compared with CK, the straw yield of 1/2N+PM treatment increased by 44% and 79%. Compared with 1/2N, the straw yield of 1/2N+PM treatment increased about 3%?8%. And the results showed:The applications of pig manure treatment did increase the grain and straw yield2 The results showed that soil ammonium-N ?NH4+-N? content in the 50%N+PM treatment was not significantly different from that in the 100%N treatment during the early rice season and the period before booting stage in the late rice season, but was significantly higher than the NPK treatment in the full-ripe stage of later rice. Soil dissolvable organic N ?DON? content in the 50%N+PM treatment was significantly higher than that in the 100%N treatment by 50%-102% in the transplanting stage, tillering stage and milk-ripe stage in the early rice season and in the booting stage, milk-ripe stage and full-ripe stage in the late rice season. Soil microbial biomass carbon and nitrogen ?MBC and MBN? amounts in the 1/2N+PM treatment were also higher than those in the 100%N treatment increased 21.5-22.8% and 5.3-7.1% respectively. The results showed:the applications of pig manure did improve the soil fertility.3 The amount of accumulative CH4 varied in 129.9?300.8 kg ha-1year-1d by applications of pig manure and inorganic fertilizer. Compared with CK, the applications of pig manure did significantly promoted the amount of accumulative CH4 by 49.8%?54.83%. In contrast to 1/2N and N, the applications of pig manure did significantly improved the amount of accumulative CH4 by 33.85%-68.3% and 36.7%-43.30% respectively. So the applications of pig manure and inorganic fertilizer did increase the amount of accumulative CH44 The amount of accumulative N2O by applications of pig manure and inorganic fertilizer showed that:In early rice season, compared with N and 1/2N, the amount of accumulative N2O by applications of pig manure and inorganic fertilizer reduced about 54.31% and 35.29% respectively. In late rice season, the 1/2N+PM and 1/2N didn't show much difference. However, in contrast to CK and 1/2N, the amount of accumulative N2O by applications of pig manure and inorganic fertilizer increased about 79.99% and 90.26%.By all year, the amount of accumulative N2O by 1/2N+PM decreased about 67.50% than N treatment. So the result was that applications of pig manure and inorganic fertilizer reduced N2O emission.5 Both GWP and yield-scaled GWP for the treatment of 1/2N+PM were significantly higher than the other three treatments. The yield-scaled GWP for the treatment of 1/2N+PM was higher than those for the N,1/2N and CK treatments by 58. 21%,26.82% and 20.63%, respectively. Therefore, combined applications of pig manure and chemical fertilizers in paddy fields would increase the GWP of CH4 and N2O emissions during rice growing seasons and this effect should be considered in regional greenhouse gases emissions inventory. |
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