Calibrating the leaf color chart for nitrogen management in different genotypes of rice and wheat in a systems perspective

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cg.contributor.affiliationCropping Systems Research, Indiaen
cg.contributor.affiliationInternational Rice Research Instituteen
cg.contributor.affiliationInternational Maize and Wheat Improvement Centeren
cg.contributor.affiliationIndian Agricultural Research Instituteen
cg.contributor.affiliationNatl. Agricultural Technol. Project Krishi Anusandhan Bhawan‐II New Delhi 110012 Indiaen
cg.identifier.doihttps://doi.org/10.2134/agronj2004.1606en
cg.issn0002-1962en
cg.issue6en
cg.journalAgronomy Journalen
cg.volume96en
dc.contributor.authorShukla, Arvind K.en
dc.contributor.authorLadha, Jagdish K.en
dc.contributor.authorSingh, V.K.en
dc.contributor.authorDwivedi, B.S.en
dc.contributor.authorBalasubramanian, Vethaiyaen
dc.contributor.authorGupta, Raj K.en
dc.contributor.authorSharma, S.K.en
dc.contributor.authorSingh, Yogendraen
dc.contributor.authorPathak, H.en
dc.contributor.authorPandey, P.S.en
dc.contributor.authorPadre, Agnes T.en
dc.contributor.authorYadav, R.L.en
dc.date.accessioned2024-12-19T12:56:38Zen
dc.date.available2024-12-19T12:56:38Zen
dc.identifier.urihttps://hdl.handle.net/10568/166772
dc.titleCalibrating the leaf color chart for nitrogen management in different genotypes of rice and wheat in a systems perspectiveen
dcterms.abstractLow N use efficiency (NUE) continues to be a problem in the rice (Oryza sativa L.)–wheat (Triticum aestivum L.) cropping system. The leaf color chart (LCC)–based real‐time N management can be used to optimize/synchronize N application with crop demand or to improve existing fixed split N recommendations. We conducted a field experiment during 2001–2003 at Modipuram, India, to determine the threshold LCC values for N application in rice and wheat, assess the need for basal N application, calibrate the LCC with a chlorophyll meter (SPAD), and work out the economics of rice–wheat systems. Treatments consisted of LCC scores of 2 to 5 for different cultivars of rice and wheat and were compared with the zero‐N control and a recommended fixed‐time N splitting. In rice, LCC ≤ 3 for ‘Basmati‐370’, 4 for ‘Saket‐4’, and 5 for ‘Hybrid 6111/PHB‐71’ produced higher yield and NUE than recommended N splits. In wheat, maintenance of LCC ≤ 4 required 120 kg N ha−1, which produced higher grain yield, N uptake, and NUE than that of recommended N splits. Chlorophyll meter reading and crop growth rate (g m−2 day−1) at 15 d after transplanting in rice and 21 d after seeding in wheat were not significantly different with or without basal N application, indicating that basal N application in rice and wheat was not necessary in soils having relatively high indigenous N supply. Both LCC and SPAD readings (r = 0.84 to 0.91) were highly correlated in rice and wheat. Net returns were 19 to 31% higher in LCC‐based N management than in fixed‐time N application for rice–wheat cropping.en
dcterms.available2004-11
dcterms.bibliographicCitationShukla, Arvind K.; Ladha, Jagdish K.; Singh, V. K.; Dwivedi, B. S.; Balasubramanian, Vethaiya; Gupta, Raj K.; Sharma, S. K.; Singh, Yogendra; Pathak, H.; Pandey, P. S.; Padre, Agnes T. and Yadav, R. L. 2004. Calibrating the leaf color chart for nitrogen management in different genotypes of rice and wheat in a systems perspective. Agronomy Journal, Volume 96 no. 6 p. 1606-1621en
dcterms.extentpp. 1606-1621en
dcterms.issued2004-11
dcterms.languageen
dcterms.licenseCopyrighted; all rights reserved
dcterms.publisherWileyen
dcterms.subjectnitrogenen
dcterms.subjectuse efficiencyen
dcterms.subjectchlorophyllen
dcterms.subjectmetersen
dcterms.subjectcropping systemsen
dcterms.subjectirrigated riceen
dcterms.subjectlowland riceen
dcterms.subjectasiaen
dcterms.typeJournal Article

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