Nitrogen-15 balances for urea and neem coated urea applied to lowland rice following two cowpea cropping systems

John, P. S.; Buresh, R. J.; Pandey, Rakesh; Prasad, Rajendra; Chua, Teresita T.

doi:10.1007/bf02377073

Cited by 19 publications

(7 citation statements)

References 27 publications

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“…2). The total recoveries of urea 'SN f o u n d in the present study support the 0 results of previous experiments with labeled urea 0 ( D e Datta et al 1987;John et al, 1989). The large recoveries of 15N derived from labeled green manure reported here are supported by the results of Westcott and Mikkelsen (1985) and W a t a n a b e et al (1989).…”

Section: Resultssupporting

confidence: 90%

Erratum

1993

Plant Soil

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Nitrogen uptake and recovery from urea and green manure in lowland rice measured by 15N and non-isotope techniques, Plant and Soil 148 (1993): 91-99.Unfortunately, the authors' names had disappeared from their previously published article. AbstractIn the recent past considerable attention is paid to minimize dependence on purchased inputs such as inorganic nitrogen fertilizer. Green manure in the form of flood-tolerant, stem-nodulating Sesbania rostrata and Aeschynomene afraspera is an alternative N source for rice, which may also increase N use efficiency. Therefore research was conducted to determine the fate of N applied to lowland rice (Oryza sativa L.) in the form of Sesbania rostrata and Aeschynomene afraspera green manure and urea in two field experiments using 15N labeled materials. 15N in the soil and rice plant was determined, and 15N balances established. Apparent N recoveries were determined by non-tracer method.15N recoveries averaged 90 and 65% of N applied for green manure and urea treatments, respectively. High partial pressures of NH 3 in the floodwater, and high pH probably resulted from urea application and favoured losses of N from the urea treatment. Results show that green manure N can supply a substantial proportion of the N requirements of lowland rice. Nitrogen released from Sesbania rostrata and Aeschynomene afraspera green manure was in synchrony with the demand of the rice plant.The effect of combined application of green manure and urea on N losses from urea fertilizer were also investigated. Green manure reduced the N losses from 15N labeled urea possibly due to a reduction in pH of the floodwater. Positive added N interactions (ANIs) were observed. At harvest, an average of 45 and 25% of N applied remained in the soil for green manure and urea, respectively.

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Section: Resultssupporting

confidence: 90%

Erratum

1993

Plant Soil

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“…Therefore, recovery of 15 N-labeled fertilizer of rice-broad bean and rice-hairy vetch systems indicate a positive contribution of biological nitrogen fixation on enhancing soil N fertility for rice production. The greater recovery of 15 N-labeled fertilizer (% of N applied) in rice after fallow when compared to the legume-based systems is consistent with those results found by Diekmann et al, (1993) and John et al (1989). The substantial amount of N unaccounted from labeled fertilizer was probably due to ammonia volatilization losses and denitrification caused by anaerobic conditions predominant during the time fertilizer was applied (Vlek and Byrnes, 1986).…”

Section: Total 15 N Balances In Ricesupporting

confidence: 91%

NITROGEN UPTAKE AND RECOVERY FROM N FERTILIZER AND LEGUME CROPS IN WETLAND RICE MEASURED BY¹⁵N AND NON-ISOTOPE TECHNIQUES

Motior

Amano

Inoue

et al. 2011

Journal of Plant Nutrition

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2 Intensive rice-based cropping systems rely on nitrogenous fertilizer for optimum grain production and legume crops could be used as an alternative nitrogen (N) source for rice. We investigated the fate of N applied to dual cropping wetland rice in the form of legume residue and 15 N labeled fertilizer. In 2001 -2002, hairy vetch and broad bean accumulated 131 and 352 kg N ha −1 of which 41 and 78% was derived from N 2 fixation. In 2002 -2003, hairy vetch accumulated 64 kg N ha −1 and broad bean accumulated 320 kg N ha −1 of which 21 to 24% was derived from hairy vetch and 31 to 82% N was derived from broad bean by N difference and 15 N-natural abundance method. Our results reveal that hairy vetch and broad bean can supply 50 -100% of N required for intensive wetland rice and can be a viable alternative N source to enhance soil fertility.

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“…In the case of fertilizer N, the discrepancy between apparent and 15 N-estimated N recoveries by rice is well known (John et a!., 1989;Schnier, 1994). presented evidence that fertilizer N uptake efficiency by flooded rice crop is indeed efficient in contrast to uptake estimates based on 15 N uptake, because the 15 N method underestimates the actual N uptake from the fertilizer.…”

Section: Discussionmentioning

confidence: 99%

Recycling in situ of Legume‐Fixed and Soil Nitrogen in Tropical Lowland Rice

George¹,

Buresh

Ladha

et al. 1998

Agronomy Journal

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In tropical rice lowlands, vegetation during the dry‐to‐wet season transition (DTW) facilitates in situ recycling of N from soil or legume biological nitrogen fixation (BNF) to wet‐season flooded rice. As little is known, we examined the fates of soil N and BNF N in DTW vegetation in a 2‐yr study on a Philippine Tropudalf using 15N‐labeled residues produced and soil‐incorporated in situ. During DTW, Sesbania rostrata (Bremek. & Oberm.), mungbean [Vigna radiata (L.) R. Wilczek var. radiata], weeds, and a weed‐free fallow were subplots in dry‐season main plots of weedy, weed‐free, and frequently tilled fallows. Rice yield and N uptake were not influenced by dry‐season fallows, which did influence soil N and BNF N in DTW vegetation and, therefore, the amount of soil N lost, removed in a product or recycled. Build‐up and decline of soil NH4−N occurred within 5 wk of residue incorporation, before significant N uptake by rice. Rice yield and N uptake responded to greater recycled DTW N; N uptake averaged 103 kg ha−1 with 208 kg S. rostrata N ha−1, 79 kg ha−1 with 62 kg mungbean N ha−1, 61 kg ha−1 with 41 kg weed N ha−1, and 44 kg ha−1 with no residue N. Nitrogen‐15 estimates of N recovery by rice (20% of S. rostrata N, 27% of mungbean N, 16% of weed N) were lower than the actual increase in rice N uptake due to residues. High proportions of residue N remained in soil, but N loss of 32% was estimated for S. rostrata N. As green manure (GM) N is ineffective beyond the first few weeks of incorporation, incorporating much legume N to flooded rice wastes valuable BNF N. Unmet rice N demand beyond early crop stage is better supplied with fertilizer N synchronized with rice N demand. A mixture of native weeds and GM legume is likely to prevent build‐up of soil NO∐3−N and allow BNF while limiting total N accumulation in the DTW vegetation for use as GM.

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Nitrogen-15 balances for urea and neem coated urea applied to lowland rice following two cowpea cropping systems

Cited by 19 publications

References 27 publications

Erratum

Erratum

NITROGEN UPTAKE AND RECOVERY FROM N FERTILIZER AND LEGUME CROPS IN WETLAND RICE MEASURED BY¹⁵N AND NON-ISOTOPE TECHNIQUES

Recycling in situ of Legume‐Fixed and Soil Nitrogen in Tropical Lowland Rice

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Nitrogen-15 balances for urea and neem coated urea applied to lowland rice following two cowpea cropping systems

Cited by 19 publications

References 27 publications

Erratum

Erratum

NITROGEN UPTAKE AND RECOVERY FROM N FERTILIZER AND LEGUME CROPS IN WETLAND RICE MEASURED BY15N AND NON-ISOTOPE TECHNIQUES

Recycling in situ of Legume‐Fixed and Soil Nitrogen in Tropical Lowland Rice

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NITROGEN UPTAKE AND RECOVERY FROM N FERTILIZER AND LEGUME CROPS IN WETLAND RICE MEASURED BY¹⁵N AND NON-ISOTOPE TECHNIQUES