Journal ArticleDOI
Leaching losses of urea-N applied to permeable soils under lowland rice
Bijay-Singh,Yadvinder-Singh,C. S. Khind,O. P. Meelu +3 more
- Vol. 28, Iss: 2, pp 179-184
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TLDR
In this paper, the performance of different fertilizer treatments was inversely related to susceptibility of N to leaching in lowland rice grown in a sandy loam soil for 60 days.Abstract:
Application of 120 kg urea-N ha−1 to lowland rice grown in a highly percolating soil in 10 equal split doses at weekly intervals rather than in 3 equal split doses at 7, 21 and 42 days after transplanting did not significantly increase rice grain yield and N uptake. Results suggest that leaching losses of N were not substantial. In lysimeters planted with rice, leaching losses of N as urea, NH
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, and NO
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beyond 30 cm depth of a sandy loam soil for 60 days were about 6% of the total urea-N and 3% of the total ammonium sulphate-N applied in three equal split doses. Application of urea even in a single dose at transplanting did not result in more N leaching losses (13%) compared to those observed from potassium nitrate (38%) applied in three split doses. Nitrogen contained in potassium nitrate was readily leached during the first week of its application. More N was lost from the first dose of N applied at transplanting than from the second or third dose. Data pertaining to yield, N uptake and per cent N recovery by rice revealed that the performance of different fertilizer treatments was inversely related to susceptibility of N to leaching.read more
Citations
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Journal ArticleDOI
Nitrate leaching in temperate agroecosystems: sources, factors and mitigating strategies
Hong J. Di,Keith C. Cameron +1 more
TL;DR: In this article, the evidence of NO3ⓘ− leachinglosses from various land use systems, including cut grassland, grazed pastures, arable cropping, mixed cropping with pasture leys, organic farming, horticultural systems, and forest ecosystems are discussed.
Journal ArticleDOI
Nitrogen losses from the soil/plant system: a review
TL;DR: It is shown that careful management of temperate soil/plant systems using best management practices and newly developed technologies can increase the sustainability of agriculture and reduce its impact on the environment.
How extensive are yield declines in long-term rice-wheat experiments in Asia? Field Crops Res
Ladha Jk,Ladha Jk,Singh Yadvinder,D. Dawe,H. Pathak,Padre At,A. T. Padre,Yadav Rl,R. L. Yadav,Singh Bijay,Y. Singh,P. Singh,Kundu Al,Amitabh Kundu,R. Sakal,N. Ram,Regmi Ap,A. P. Regmi,S. K. Gami,Gami Sk,Bhandari Al,A. L. Bhandari,R. Amin,Yadav Cr,C. R. Yadav,E. M. Bhattarai,Bhattarai Em,S. K. Das,H.P Aggarwal,Aggarwal Hp,R. K. Gupta,Gupta Rk,P. R. Hobbs,Hobbs Pr +33 more
TL;DR: In this paper, the authors analyzed 33 rice-wheat LTE in the Indo-Gangetic Plains (IGP) of South Asia, non-IGP in India, and China to investigate the extent of yield stagnation or decline and identify possible causes of yield decline.
Journal ArticleDOI
How extensive are yield declines in long-term rice-wheat experiments in Asia?
Jagdish K. Ladha,David Dawe,Himanshu Pathak,A. T. Padre,R. L. Yadav,Bijay Singh,Yadvinder Singh,Y.V. Singh,P. P. Singh,Amitabh Kundu,R. Sakal,N. Ram,A. P. Regmi,S. K. Gami,A. L. Bhandari,R. Amin,C. R. Yadav,E. M. Bhattarai,S. K. Das,H.P Aggarwal,R. K. Gupta,Peter Hobbs +21 more
TL;DR: In this paper, the authors analyzed 33 rice-wheat LTE in the Indo-Gangetic Plains (IGP) of South Asia, non-IGP in India, and China to investigate the extent of yield stagnation or decline and identify possible causes of yield decline.
Journal ArticleDOI
Yield and Soil Nutrient Changes in a Long-Term Rice-Wheat Rotation in India
TL;DR: Results show that current fertilizer recommendations are inadequate for maintaining yields of rice and wheat in South Asia and this cropping system may not be sustainable without increased K input to maintain soil K above sufficiency levels.
References
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Journal ArticleDOI
Steam distillation methods for determination of ammonium, nitrate and nitrite
J. M. Bremner,D. R. Keeney +1 more
TL;DR: In this article, steam distillation methods of determining ammonium, nitrate, and nitrite in the presence of alkali-labile organic nitrogen compounds are described, which are used for tracer studies using 15N-enriched compounds.
Journal ArticleDOI
Extraction and colorimetric determination of urea in soils.
L.A. Douglas,J. M. Bremner +1 more
TL;DR: In this paper, a simple colorimetric method of determining urea in soils is described, where the soil sample is extracted with 2M KCl containing a urease inhibitor (phenylmercuric acetate), and the extract is analyzed for urea by measurement of the red color formed when an aliquot is heated with diacetyl monoxime and thiosemicarbazide under acidic conditions (phosphoric acid-sulfuric acid medium).
Journal ArticleDOI
Analytical methods in15N research
TL;DR: The different steps in the digestion, distillation, and isotope ratio analysis of15 N-labeled soils, plant material, and fertilizers are described and it is hoped that this comprehensive description of procedures will encourage the expanded and proper use of15N.