caa a22 4500 463209109 CHVBK 20180405153135.0 cr unu---uuuuu 170326e20070601xx s 000 0 eng 10.1007/s10705-006-9082-2 doi (NATIONALLICENCE)springer-10.1007/s10705-006-9082-2 On-farm evaluation of leaf color chart for need-based nitrogen management in irrigated transplanted rice in northwestern India [Elektronische Daten] [Yadvinder-Singh,, Bijay-Singh,, Jagdish Ladha, Jaswinder Bains, Rajeev Gupta, Jagmohan-Singh,, V. Balasubramanian] Nitrogen use efficiency (NUE) in rice is low due to the inefficient management of fertilizer N by farmers. We evaluated a leaf color chart (LCC) as a simple tool for improving the time and rate of N fertilizer use in farmers' fields for 4years (2000-2003) in irrigated rice in northwestern India. Application of N fertilizer whenever leaf greenness was less than shade 4 on the LCC (the critical LCC value) produced rice grain yields on a par with blanket recommendation of applying 120kg Nha−1 in three equal splits in different years, but it resulted in an average saving of 26% fertilizer N across villages and seasons. In most situations, there was no significant advantage of applying 20kgNha−1 as basal N at transplanting on grain yield and NUE of rice compared with no basal N. Use efficiencies of fertilizer N were higher when N was applied using LCC with a critical value of 4 than the recommended practice of applying 120kgNha−1 in three equal split doses on all sites and in all years. The LCC with a critical value of 4 for real-time N management can be efficiently used to increase NUE in all types of inbred rice cultivars presently popular with the farmers of the Indian Punjab. The LCC is a cheap and easy-to-use tool that allows real-time N management by farmers on a large area leading to improved fertilizer N use efficiency, and reduced risks associated with fertilizer N application. Springer Science+Business Media B.V., 2007 Agronomic efficiency of N nationallicence Leaf color chart nationallicence Partial factor productivity of N nationallicence Recovery efficiency of N nationallicence Rice nationallicence Rice cultivars nationallicence Yadvinder-Singh, Department of Soils, Punjab Agricultural University, Ludhiana, India aut Bijay-Singh, Department of Soils, Punjab Agricultural University, Ludhiana, India aut Ladha Jagdish International Rice Research Institute—India Office, NASC Complex, Pusa, New Delhi, India aut Bains Jaswinder Department of Soils, Punjab Agricultural University, Ludhiana, India aut Gupta Rajeev Department of Soils, Punjab Agricultural University, Ludhiana, India aut Jagmohan-Singh, Department of Soils, Punjab Agricultural University, Ludhiana, India aut Balasubramanian V. International Rice Research Institute, Los Banos, Philippines aut Nutrient Cycling in Agroecosystems Kluwer Academic Publishers 78/2(2007-06-01), 167-176 1385-1314 78:2<167 2007 78 10705 https://doi.org/10.1007/s10705-006-9082-2 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10705-006-9082-2 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Yadvinder-Singh Department of Soils, Punjab Agricultural University, Ludhiana, India aut NATIONALLICENCE 700 1- Bijay-Singh Department of Soils, Punjab Agricultural University, Ludhiana, India aut NATIONALLICENCE 700 1- Ladha Jagdish International Rice Research Institute—India Office, NASC Complex, Pusa, New Delhi, India aut NATIONALLICENCE 700 1- Bains Jaswinder Department of Soils, Punjab Agricultural University, Ludhiana, India aut NATIONALLICENCE 700 1- Gupta Rajeev Department of Soils, Punjab Agricultural University, Ludhiana, India aut NATIONALLICENCE 700 1- Jagmohan-Singh Department of Soils, Punjab Agricultural University, Ludhiana, India aut NATIONALLICENCE 700 1- Balasubramanian V. International Rice Research Institute, Los Banos, Philippines aut NATIONALLICENCE 773 0- Nutrient Cycling in Agroecosystems Kluwer Academic Publishers 78/2(2007-06-01), 167-176 1385-1314 78:2<167 2007 78 10705 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer