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Incorporation of spring maize into paddy fields increased nitrogen uptake in late rice by enhancing soil nitrogen supply: Field 15N tracer studies.
- Source :
-
Field Crops Research . Aug2023, Vol. 299, pN.PAG-N.PAG. 1p. - Publication Year :
- 2023
-
Abstract
- To assess the impacts of the incorporation of spring maize into paddy fields on the utilization of nitrogen (N) fertilizer by late rice, a two-year microplot experiment was performed using labeled 15N-urea to trace the fate of N fertilizer in spring maize-late rice (SM-LR) and early rice-late rice (ER-LR) systems. Compared with ER-LR system, SM-LR system showed higher grain yields and total N use of late rice. However, no difference in fertilizer-N use in late rice between the two cropping systems, and the utilization of soil-N rather than fertilizer-N was responsible for the increased total N uptake by late rice. Further microplot experiments on the fate of soil residual 15N showed a greater amount of soil residual 15N in the spring maize season than in the early rice season (122 vs. 72 kg N ha−1). However, soil residual 15N from the first season had a negligible contribution to the utilization of N in late rice. We conclude that the improvement in the soil N supply accounts for the increased total N use in late rice under the incorporation of spring maize into paddy fields. • Incorporation of spring maize in paddy fields increased total N uptake in late rice. • Fertilizer-N uptake in late rice was not improved by incorporating spring maize. • More soil residual 15N was found in the spring maize season than early rice season. • Soil residual 15N had a minor contribution to total N uptake in late rice. • Enhancement of soil-N supply accounted for the increased N uptake in late rice. [ABSTRACT FROM AUTHOR]
- Subjects :
- *SPRING
*NITROGEN in soils
*NITROGEN fertilizers
*CORN
*RICE
*PADDY fields
Subjects
Details
- Language :
- English
- ISSN :
- 03784290
- Volume :
- 299
- Database :
- Academic Search Index
- Journal :
- Field Crops Research
- Publication Type :
- Academic Journal
- Accession number :
- 164246999
- Full Text :
- https://doi.org/10.1016/j.fcr.2023.108990