TY  - JA
AU  - Timsina,J.
AU  - Panaullah,G.M.
AU  - Saleque,M.A.
AU  - Ishaque,M.
AU  - Pathan,A.B.M.B.U.
AU  - Quayyum,M.A.
AU  - Connor,D.J.
AU  - Saha,P.K.
AU  - Humphreys,E.
AU  - Meisner,C.A.
TI  - Nutrient uptake and apparent balances for rice-wheat sequences. I. Nitrogen
SN  - 0190-4167
PY  - 2006///
CY  - New York (USA)
PB  - Taylor & Francis
KW  - AGROVOC
KW  - Nitrogen content
KW  - Nutrient uptake
KW  - Cereals
KW  - Legumes
KW  - Cropping systems
KW  - Nutrient balance
KW  - Rice
KW  - Wheat
KW  - Maize
N1  - Peer review; Peer-review: Yes - Open Access: Yes|http://science.thomsonreuters.com/cgi-bin/jrnlst/jlresults.cgi?PC=MASTER&ISSN=0190-4167
N2  - Nitrogen (N) nutrition of the rice-wheat (RW) systems of the Indo-Gangetic Plain is important for sustaining the region's productivity and food needs. Soil N plays an important role in regulating the supply of N to plants. Monitoring plant concentrations, uptake, and balance of N assist in our understanding of plant and soil N status and in devising N-fertilizer strategies for both individual crops and a cropping system. Field experiments with rice-wheat-mungbean and rice-wheat-maize annual cropping sequences were conducted at Joydebpur, Nashipur, and Ishwordi in Bangladesh, which differ in their soils and climates. The experiments compared three pre-rice treatments (mungbean residues retained, mungbean residues removed, and maize residues removed), supplying each with two fertilizer levels (soil-test based, or STB, and farmers' practice, or FP). Zero N (control) treatments were included, with all other nutrients applied as STB or FP. The objectives were to detect N deficiency, if any, in the component crops, and to determine the changes in soil N fertility, plant N uptake, and soil N balance for various RW sequences. There was a significant decrease in mineral N in the topsoil (0–15 cm) of the +N mungbean and maize-residues removed treatments at Ishwordi, and a generally significant but less marked decline under the same treatments at Nashipur. Wheat and maize crops suffered from N deficiency ranging from 33% to 95% each year, at all sites, but deficiency in rice and mungbean was minimal. Annual system-level N uptake across sites ranged from 89 kg ha−1 for the control to 239 kg ha−1 for sequences containing maize with N. There were significant linear relationships between total system productivity (TSP) and annual N application and between TSP and annual system-level N uptake. Considering no N loss through the system, N fertilizer resulted in a positive N balance that ranged between 24–190 kg ha−1 compared with a negative balance of between 40–49 kg ha−1 without it. However, if a 30% N loss was assumed, N balances were reduced to between −37–62 kg/ha−1 for N-containing treatments, and to between −64–55 kg/ha−1 for the control treatments. Further research is needed to understand N depletion and replenishment and to sustain the productivity of the RW system
UR  - https://hdl.handle.net/20.500.12665/420
T2  - Journal of Plant Nutrition
DO  - https://doi.org/10.1080/01904160500416539
ER  -