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• Site-Specific Nutrient Management for NPK Fertilizationin Sugarcane in Mekong Delta Alluvial Island Soil

  Received: 05-04-2015 / Accepted: 29-11-2015

   Abstract PDF (VIETNAMESE)

  Site-specific nutrient management (SSNM) was used to: (i) evaluate the effect of inorganic and sugarcane dregs as fertilizers on sugarcane yield and Brix and (ii) determine the NPK uptake and agronomic efficiency (AE) thereby to recommend fertilizers rate for sugarcane cultivation inthe alluvial island soil. Field experiment with sugarcane of new planting crop (2011) and ratoon crop (2012) was conducted at Cu Lao Dung District of Soc Trang. The experiment was arranged in a Randomized Complete Block Design (RCBD) with four replication and two factors: (A) lacking particular macronutrient(s) (NPK, NP, NK, PK) and (B) sugarcane dregs (BBM, KBB). Results showed that potassium application at 200 kgK2O/ha increased Brix of sugarcane. Nutrients supplied by the soil were 32.6; 46.2 and 56.1 (N, P and K respectively) as percentage of total nutrient requirement of the plant. Nitrogen was the most important factor affecting sugarcane yield. Sugarcane dregs application at 10 tons/ha increased NPK uptake by the plant. By using SSNM,331 N-155 P2O-253 K2O (kg/ha) are recommended for sugarcane grown in the alluvial island soil.

• 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

  Nguyen Quoc Khuong, Nguyen Kim Quyen, Ngo Ngoc Hung

  Received: 21-09-2015 / Accepted: 06-03-2016

   Abstract PDF (VIETNAMESE)

  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 withSFC 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 appliedwith SFC compared to LCCalone. Sugarcane yield increasedby12 -15 tons ha-1in Cu Lao Dung and 11-13 tons ha-1in Long My through nitrogen application by LCC on soils with and without SFC.

• The Effects of N, P, K Fertilizers and Sugarcane Filter Cake on Growth and N, P, K Uptake of Young and Ratoon Sugarcane on Alluvial Soil in The Mekong Delta

  Nguyen Quoc Khuong, Nguyen Kim Quyen, Ngo Ngoc Hung

  Received: 10-12-2015 / Accepted: 15-09-2015

   Abstract PDF (VIETNAMESE)

  The objective of this study was to compare the effects of N, P, K fertilizers in combination with sugarcane filter cake on growth and N, P, K uptake of young and ratoon sugarcaneon alluvial soil. A 22factorial experiment in a randomized complete block including four inorganic fertilizer treatments (O1: N, P, K;O2: N, P;O3: N, K and O4: P, K) and two sugarcane filter cake (SFC) treatments (S1: 10 and S2: 0 tons ha-1) with four replications was conducted in Hau Giang province during 2011 (youngsugarcane crop) and 2012 (ratoon sugarcane crop). The total treatments were O1S1 (N, P, K fertilizers application + 10 tons SFC ha-1), O2S1 (N, P fertilizers application + 10 tons SFC ha-1), O3S1 (N, K fertilizers application + 10 tons SFC ha-1), O4S1 (P, K fertilizers application + 10 tons SFC ha-1), O1S2 (N, P, K fertilizers application), O2S2 (N, P fertilizers application), O3S2 (N, K fertilizers application) and O4S2 (P, K fertilizers application). Results showed that growth and N, P, K uptake decreased both plant and ratoon sugarcane crop as without single N, P, K application. The ratoon sugarcane yield decreased by 25 tons per hectare in comparison with plant sugarcane yield, which result in lower N, P, K uptake. Where, phosphorus uptake reduced the highest value. The sugarcane filter cake application improved N, P, K uptake of ratoon sugarcane, but it increased only phosphorus uptake of plant sugarcane. However, it improved sugarcane yield of two crops. The sugarcane filter cake application improved sugarcane yield, nitrogen and potassium uptake of ratoon sugarcane compared to plant sugarcane.