Time and mode of nitrogen fertilizer application to tropical wetland rice

Craswell, E. T.; Datta, SK De; Obcemea, W. N.; Hartantyo, M

doi:10.1007/bf01050197

Cited by 80 publications

(22 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The increased consumption and low NUE for urea in lowland rice system is one of the major sources of N loading to the environment. Efficient use of applied N depends on the schedule and techniques of fertilizer application, the rate of N release from a fertilizer source, N transport through soil profile, rice genotypes, and other management practices (Fageria and Baligar 2001;Soliman and Abdel Monem 1996;Russo 1993;Craswell et al 1981). Poor NUE for nitrogenous fertilizers results from various loss mechanisms such as volatilization, leaching, and denitrification.…”

Section: Introductionmentioning

confidence: 99%

Performance of polymer-coated urea in transplanted rice: effect of mixing ratio and water input on nitrogen use efficiency

Patil

Das

Barak³

et al. 2010

Paddy Water Environ

View full text Add to dashboard Cite

Polymer-coated urea (PCU) is an important alternative to uncoated urea for improving nitrogen (N) use efficiency (NUE). Only a few studies discuss their utility for lowland rice systems. A 2-year field study was conducted to examine if nitrogen loading is reduced in lowland rice ecosystem by using mixture of PCU and uncoated urea without sacrificing yield. Five treatments involving two mixtures of PCU with 50 and 70% coated urea each at 70 and 50% of recommended dose (80 kg N ha -1 ) and one with uncoated urea at 100% recommended dose were laid out in a completely randomized design. Selected plant growth parameters and plant available N contents (NH 4 -N plus NO 3 -N) in soil solution and ponded water were measured over a period of 65 days after transplanting.

show abstract

Section: Introductionmentioning

confidence: 99%

Performance of polymer-coated urea in transplanted rice: effect of mixing ratio and water input on nitrogen use efficiency

Patil

Das

Barak³

et al. 2010

Paddy Water Environ

View full text Add to dashboard Cite

show abstract

“…Nitrogen is the most important nutrient in rice production. It is the primary input in modern rice farming (Craswell et al, 1981;Yoshida, 1981). Large amounts of nitrogen fertilizer, amounting to 112 million tons a year are used [globally in 2009[globally in to 2011[globally in (FAOSTAT, 2013] in cultivation of rice and other economic crops.…”

Section: Introductionmentioning

confidence: 99%

Screening of Nitrogen Fixing Endophytic Bacteria in Oryza sativa L.

Hongrittipun¹,

Youpensuk²,

Rerkasem³

2014

JAS

View full text Add to dashboard Cite

Nitrogen (N) is an essential element for the growth and yield of rice. Some endophytic bacteria can fix N 2 from the air and convert to nitrogen compounds that can be utilized by plants. In this study, endophytic bacteria were isolated from one-month-old seedlings of five rice (Oryza sativa L.) varieties (Muey Nong 24, Muey Nong 25, Pathum Thani 1, Suphan Buri 1 and Chai Nat 1) growing without nitrogen fertilizer in the farmers' field. One hundred and twenty-three isolates of endophytic bacteria were obtained from the roots, stems and leaves of these rice varieties. Nitrogenase activity of the bacteria in N-free culture medium was determined by acetylene reduction assay. Seven isolates of the bacteria with highest nitrogenase activity were identified by phylogenetic analysis of the 16S rRNA genes, and found to belong to Burkholderia cepacia (CS5), Citrobacter sp.

show abstract

“…Pohlert et al (2007): 135 kg N ha À1 and Schoumans et al (2009): 236 kg N ha À1 ), but as demonstrated by Pohlert et al (2007) SWAT may overestimate denitrification due to the model-process routine. Losses of nitrogen by denitrification are influenced by various factors (for rice paddies, for instance, the fertilizer-application method, timing and applied nitrogen compound) (Craswell et al 1981), which challenges comparisons between land-use management practices. Nevertheless, the denitrification rate simulated in the present study lies within the combined span of annual soil denitrification rates for forests (,0.1-40 kg N ha À1 ) and agriculture (0-239 kg N ha À1 ) reported by Barton et al (1999), where irrigated and inorganic fertilised soils tend to exhibit higher rates (ranging from 49 to 239 kg N ha À1 ).…”

Section: Management Options For Improving Reservoir Water Qualitymentioning

confidence: 99%

Assessing ways to combat eutrophication in a Chinese drinking water reservoir using SWAT

Nielsen

Trolle

et al. 2013

Mar. Freshwater Res.

View full text Add to dashboard Cite

Abstract. Across China, nutrient losses associated with agricultural production and domestic sewage have triggered eutrophication, and local managers are challenged to comply with drinking water quality requirements. Evidently, the improvement of water quality should be targeted holistically and encompass both point sources and surface activities within the watershed of a reservoir. We expanded the ordinary Soil Water Assessment Tool -(SWAT) with a widely used empirical equation to estimate total phosphorus (TP) concentrations in lakes and reservoirs. Subsequently, we examined the effects of changes in land and livestock management and sewage treatment on nutrient export and derived consequences for water quality in the Chinese subtropical Kaiping (Dashahe) drinking water reservoir (supplying 0.4 million people). The critical load of TP was estimated to 13.5 tonnes yr À1 in order to comply with the minimum drinking water requirements, which corresponds to 87% of the simulated load to the reservoir at present. Both the implementation of buffer zones along rivers and removal of sewage discharges showed marked improvement in reservoir water quality. Future research should focus on both hydrological model performance and nutrient transport pathways, which are challenged by a complex artificially altered water infrastructure in the form of ditches, channels and ponds in monsooninfluenced subtropical watersheds.

show abstract

Time and mode of nitrogen fertilizer application to tropical wetland rice

Cited by 80 publications

References 11 publications

Performance of polymer-coated urea in transplanted rice: effect of mixing ratio and water input on nitrogen use efficiency

Performance of polymer-coated urea in transplanted rice: effect of mixing ratio and water input on nitrogen use efficiency

Screening of Nitrogen Fixing Endophytic Bacteria in Oryza sativa L.

Assessing ways to combat eutrophication in a Chinese drinking water reservoir using SWAT

Contact Info

Product

Resources

About