Calibrating the Leaf Color Chart for Nitrogen Management in Different Genotypes of Rice and Wheat in a Systems Perspective

Abstract

tions at specified growth stages is the most common practice followed by the farmers (PhilRice, 1991;Pillai Low N use efficiency (NUE) continues to be a problem in the rice and Kundu, 1993).This does not consider the dynamic (Oryza sativa L.)-wheat (Triticum aestivum L.) cropping system. The leaf color chart (LCC)-based real-time N management can be crop N requirement and soil N supply because N recomused to optimize/synchronize N application with crop demand or to mendations were mainly derived from empirical testing improve existing fixed split N recommendations. We conducted a field of N response to few fixed doses. In fixed-time recomexperiment during 2001-2003 at Modipuram, India, to determine the mended N split schedule, the N splitting is skewed, the threshold LCC values for N application in rice and wheat, assess the first two splittings [one as basal at the time of planting/ need for basal N application, calibrate the LCC with a chlorophyll sowing and another at 25 to 30 d after transplanting meter (SPAD), and work out the economics of rice-wheat systems. (DAT) in rice and 21 to 25 d after sowing (DAS) in Treatments consisted of LCC scores of 2 to 5 for different cultivars wheat] occur at 21 to 30 DAS/DAT, and third dose is of rice and wheat and were compared with the zero-N control and a split at panicle initiation (PI) stage. In some rice-growrecommended fixed-time N splitting. In rice, LCC Յ 3 for 'Basmatiing countries, present recommendations call for 50 to 370', 4 for 'Saket-4', and 5 for 'Hybrid 6111/PHB-71' produced higher yield and NUE than recommended N splits. In wheat, maintenance and A.

Climate Change Adaptation: Real Time Nitrogen Management in Maize (Zea mays L.) Using Leaf Colour Chart

“…Improvement in leaf chlorophyll content due to application of 80 kg N/ha in two splits at LCC 4 over fixed time application of 80 kg N/ha supports improved photosynthetic rate leading to higher growth and biomass production. The enhanced growth with LCC based nitrogen application was also reported by Singh et al (2002) and Shukla et al (2004).…”

Growth, Yield and Nitrogen Use Efficiency in Wheat as Influenced by Leaf Colour Chart and Chlorophyll Meter Based Nitrogen Management

“…Higher photosynthetic rate at lower rate of nitrogen in LCC and SPAD based nitrogen management reflected in better reproductive growth too. Similar finding was also reported by Shukla et al, (2004) and Mathukia et al, (2014).…”

Nitrogen Transformations in Submerged Soils

“…The relatively high price of the chlorophyll meter, however, limits its use by individual farmers. A simple, nondestructive alternative is to monitor leaf N status with a leaf color chart (LCC) (Furuya, 1987;Balasubramanian et al, , 2003Bij ay-Singh et al, 2002;Shukla et al, 2004). The LCC is typically a durable plastic strip about 7 cm or more wide and about 13 cm or more long, containing four or more panels that range in color from yellowish green to dark green.…”