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Varinderpal-Singh, Yadvinder-Singh, Bijay-Singh, Baldev-Singh, RK Gupta, J Singh, JK Ladha, V Balasubramanian (2007)
Performance of site specific nitrogen management for irrigated transplanted rice in northwestern IndiaArch Agron Soil Sci, 53
Varinderpal-Singh, Bijay-Singh, Yadvinder-Singh, HS Thind, RK Gupta (2010)
Need-based nitrogen management using the chlorophyll meter and leaf colour chart in rice and wheat in South Asia: a reviewNutr Cycl Agroecosyst, 88
VC Baligar, NK Fageria, ZL He (2001)
Nutrient use efficiency in plantsCommun Soil Sci Plant Anal, 32
K Girma, KL Martin, RH Anderson, DB Arnall, KD Brixey, MA Casillas, B Chung, BC Dobey, SK Kamenidou, SK Kariuki, EE Katsalirou, JC Morris, JQ Moss, CT Rohla, BJ Sudbury, BS Tubana, WR Raun (2006)
Mid-season prediction of wheat grain yield potential using plant, soil, and sensor measurementsJ Plant Nutr, 29
Varinderpal-Singh, Yadvinder-Singh, Bijay-Singh, HS Thind, A Kumar, M Vashistha (2011)
Calibrating the leaf colour chart for need based fertilizer nitrogen management in different maize (Zea mays L.) genotypesField Crops Res, 120
A Walkley, IA Black (1934)
An examination of the Degtjareff method for determining soil, organic matter and a proposed modification of the chromic acid titration methodSoil Sci, 37
(2009)
Package of practices for crops of Punjab
NK Fageria, VC Baligar (2005)
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JC Katyal, Bijay-Singh, PLG Vlek, RJ Buresh (1987)
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Bijay-Singh, Yadvinder-Singh, JK Ladha, KF Bronson, V Balasubramanian, Jagmohan-Singh, CS Khind (2002)
Chlorophyll meter- and leaf color chart-based nitrogen management for rice and wheat in northeastern IndiaAgron J, 94
AK Shukla, JK Ladha, VK Singh, BS Dwivedi, V Balasubramanian, RK Gupta, SK Sharma, Y Singh, H Pathak, PS Pandey, AT Padre, RL Yadav (2004)
Calibrating the leaf color chart for nitrogen management in different genotypes of rice and wheat in a systems perspectiveAgron J, 96
ML Jat, B Bijay-Singh, B Gerard (2014)
Nutrient management and use efficiency in wheat systems of South AsiaAdvAgron, 125
KK Win (2003)
Ecology and development series no. 12
A Dobermann, C Witt, S Abdulrachman, HC Gines, R Nagarajan, TT Son, PS Tan, GH Wang, NV Chien, VYK Thoa, CV Phung, P Stalin, P Muthukrishnan, V Ravi, M Babu, GC Simbahan, MAA Adviento (2003)
Soil fertility and indigenous nutri ent supply in irrigated rice domams of AsiaAgron J, 95
A Nayyar, Bijay-Singh, Yadvinder-Singh (2006)
Nitrogen supplying capacity of soils to rice and wheat and soil nitrogen availability indicesCommun Soil Sci Plant Anal, 37
A Bhatia, H Pathak, N Jain, PK Singh, R Tomer (2012)
Greenhouse gas mitigation in rice–wheat system with leaf color chart-based urea applicationEnviron Monit Assess, 184
Bijay-Singh, Varinderpal-Singh, Yadvinder-Singh, HS Thind, A Kumar, Satinderpal-Singh, OP Choudhary, RK Gupta, M Vashistha (2013)
Supplementing fertilizer nitrogen application to irrigated wheat at maximum tillering stage using chlorophyll meter and optical sensorAgric Res, 2
Yadvinder-Singh, Bijay-Singh, JK Ladha, JS Bains, RK Gupta, Jagmohan-Singh, V Balasubramanian (2007)
On-farm evaluation of leaf color chart for need-based nitrogen management in irrigated transplanted rice in northwestern IndiaNutr Cycl Agroecosyst, 78
JK Ladha, H Pathak, TJ Krupnik, J Six, CV Kessel (2005)
Efficiency of fertilizer nitrogen in cereal production: retrospects and prospectsAdv Agron, 87
Varinderpal-Singh, Bijay-Singh, Yadvinder-Singh, HS Thind, Gobinder-Singh, Satwinderjit-Kaur, A Kumar, M Vashistha (2012)
Establishment of threshold leaf colour greenness for need-based fertilizer nitrogen management in irrigated wheat (Triticum aestivum L.) using leaf colour chartField Crops Res, 130
H Pathak, PK Aggarwal, R Roether, N Kalra, S Bandgopadhaya, S Prasad, H Vankeulen (2003)
Modelling the quantitative evaluation of soil nutrient supply, nutrient use efficiency and fertilizer requirements of wheat in IndiaNutr Cycl Agroecosyst, 65
Site-specific fertilizer nitrogen management (SSNM) could be the best management option to avoid excessive and untimely nitrogen (N) applications in wheat. Field experiments were conducted in soils of varying inherent fertility in diverse agro-climatic zones to provide SSNM strategy for wide range of wheat genotypes. The intensity of leaf colour greenness of the first fully exposed top leaf was measured using leaf colour chart (LCC) and chlorophyll meter (SPAD) at different growth stages. The spectral properties of leaves at different growth stages differed among the different wheat genotypes except at Feekes 6 stage, thus the leaf greenness measured only at this stage can be used to make SSNM decisions. After applying 25 kg N ha−1 at planting and 45 kg N ha−1 at Feekes 2 stage, the leaf greenness of the first fully exposed top leaf measured with LCC at Feekes 6 stage was used to decide the amount of site-specific fertilizer N to be applied as topdressing. The LCC guided fertilizer N dose sustained grain yield to the level as obtained with soil test based N applications with the less use of 20–50 kg N ha−1. The practice of applying additional N or just increasing number of split doses in soils with low Walkley–Black organic carbon content may not improve grain yield unless plants really need it. The SSNM strategy improved agronomic efficiency of applied fertilizer N in different wheat genotypes grown under diverse range of agro-climatic conditions and in soils with variable indigenous N supply.
Nutrient Cycling in Agroecosystems – Springer Journals
Published: Jun 20, 2017
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