التفاصيل البيبلوغرافية
| العنوان: |
Fate of 15N Derived from Composts and Urea In Soils under Different Long-term N Management In Pot Experiments. |
| المؤلفون: |
Liangguo Luo, E. A., Kondo, Motohiko, Itoh, Sumio |
| المصدر: |
Compost Science & Utilization; Winter2004, Vol. 12 Issue 1, p18-24, 7p, 3 Charts, 3 Graphs |
| مصطلحات موضوعية: |
COMPOSTING, UREA as fertilizer, SOIL management, ORGANIC compounds, SUSTAINABLE agriculture, NITROUS oxide, NITROGEN, FERTILIZERS |
| مستخلص: |
Understanding of dynamics of N derived from organic N sources in soil is required for the development of sustainable agricultural systems. The aim of this paper is to compare, using pot experiments, the fate of N from urea (UF) and organic N sources such as rice straw compost (RC) and cattle compost (CC) using 15N labeled materials in paddy soil planted with rice. Two soils with a history of long-term applications of chemical fertilizers (LTCN) and organic N sources, i.e. straw compost +soybean cake, (LTON), were also compared. Nitrous oxide emissions were monitored during the growing period. Yield and N uptake of rice were higher in LTON soil than LTCN soil with no significant interaction with N applications. Chemical fertilizer increased yield and N uptake with a recovery rate by rice of 36 to 45%. Nitrogen recovery from RC and CC by rice was less than 10%. When recovery of N in soil was included with that recovered in the plant, 70% and 61% of applied N in the UF treatment was recovered from the LTCN and LTON soils, respectively. In comparison, more than 95% of applied N was recovered in the plant and soil for the RC and CC treatments. There was a sharp increase in N2O emission during the aerated period in nonplanted pots regardless of whether supplemental N was added, and this was associated with the increase in NO3-in soil solution at 0.5 cm depth. There was a much lower N2O emission in planted pots than nonplanted pots with no significant difference among the LTCN and LTON soils or the N treatments. The results indicated that the application of organic N source provided lower N supply to the plant than urea, but also could reduce N loss because of higher retention in the soil. Long-term continuous application of organic N sources enlarged the labile N pool without increasing N2O emission. Nitrous oxide emission was important during the mid-season aerated period from pot experiments and was partly... [ABSTRACT FROM AUTHOR] |
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| قاعدة البيانات: |
Complementary Index |
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