Yearly and field variations of paddy-upland rotational fields in nitrogen mineralization and nitrogen absorption by rice in paddy-upland rotational field - a case study in the Nara basin for four years
Ikenaga, S.; Matsumoto, N.; Inoue, H.; Inamura, T.
Japanese Journal of Crop Science 74(3): 291-297
Nitrogen mineralization in the soil and nitrogen absorption by rice in paddy-upland rotational fields (rice-wheat-soyabean) were studied in the Nara basin, Japan for four years (2000-03) in comparison with those in adjacent single-cropped paddy fields. When no nitrogen fertilizer was applied, the crop rotational fields did not increase soil nitrogen mineralization owing to the decrease of total nitrogen and carbon in the soils by repeated crop rotations.