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Real-time nitrogen management in aerobic rice by adopting leaf color chart (LCC) as influenced by silicon

Author:
Yogendra, N. D., Kumara, B. H., Chandrashekar, N., Prakash, N. B., Anantha, M. S., Shashidhar, H. E.
Source:
Journal of plant nutrition 2017 v.40 no.9 pp. 1277-1286
ISSN:
1532-4087
Subject:
calcium silicate, color, field experimentation, grain yield, leaves, nitrogen, nitrogen fertilizers, nutrient use efficiency, rice, silicon
Abstract:
Leaf color chart (LCC) guides fertilizer nitrogen (N) application to rice as per requirement of the crop on the basis of a critical leaf color. Two field experiments were conducted to evaluate the effect of silicon (Si) and LCC based N management in aerobic rice. Following LCC-based N management, from 60 to 90 kg N ha ⁻¹ and 75 to 100 kg N ha ⁻¹ with 10–40% and 25–30% less fertilizer N was used without any reduction in yield as compared to the package of practices of 100 (50 kg N ha ⁻¹ as basal + two split of 25 kg N ha ⁻¹) kg N ha ⁻¹ respectively, during both the seasons. The highest grain yield was noticed with 90 kg N ha ⁻¹ (30 kg N ha ⁻¹ as basal + LCC-3) and 100 kg N ha ⁻¹ (50 kg N ha ⁻¹ as basal + two split of 25 kg N ha ⁻¹) along with the application of calcium silicate (CaSiO ₃) at 2 t ha ⁻¹ as sources of Si and on par with 60 kg N ha ⁻¹ (no basal + LCC-3) and 75 kg N ha ⁻¹ (30 kg N ha ⁻¹ as basal + LCC-3), respectively, during the season in 2008 and 2009. Higher fertilizer N use efficiency was recorded with Si and need-based N management using LCC-3 rather than recommended dose of fertilizer N.
Agid:
5693844