The Efficiency of Nitrogen Application by Leaf Color Chart and Sugarcane Filter Cake on Growth, Yield and N Uptake of Sugarcane on Alluvial Soils in The Mekong Delta

Abstract

      The objective of this study was to evaluate efficiency of nitrogen application by leaf color chart (LCC) on growth, yield and N uptake of sugarcane on alluvial soils applied with sugarcane filter cake (SFC) in the Mekong Delta. The experiment was conducted in a randomized complete block with four replications. The treatments were (i) nitrogen application timing by LCC, (ii) nitrogen application timing by recommendation, (iii) nitrogen application timing by LCC on alluvial soils applied with SFC and (iv) nitrogen application timing by recommendation on alluvial soils applied with SFC. Results showed that the nitrogen application by LCC increased plant height, yield, N uptake compared to nitrogen application by recommendation on alluvial soils with and without SFC. Besides, nitrogen application by LCC was equally efficient as nitrogen application by recommendation combined with SFC in terms of plant height, plant density, yield, N uptake in Cu Lao Dung and Long My. The nitrogen application timing by LCC was extended on alluvial soils applied with SFC compared to LCC alone. Sugarcane yield increased by 12 -15 tons ha^-1 in Cu Lao Dung and 11-13 tons ha^-1 in Long My through nitrogen application by LCC on soils with and without SFC.