RCM [Rice Crop Manager] N fertilizer trials for irrigated rice
2019
Alonzo, C.D.K. | Deomano, K.L.T. | Collado, W.B.
Nitrogen is the most limiting element in almost all soils. Proper application of N fertilizer is vital in improving crop growth and grain yields. Thus, the Rice Crop Manager, a web-decision support tool, designed to provide field- and season-specific nutrient management recommendations to rice (Oryza sativa), is continuously being enhanced. This particular study aimed to determine the effect of additional and reduced N fertilizer during the active tillering (AT) and panicle initiation (PI) stages on grain yield when RMC target yield is lower than 6 t/ha and higher than or equal to 6 t/ha, respectively. The trails were conducted during the 2016 RCM Research Season 6 in different locations. The treatments were Farmer's Practice (FP), RCM current recommendation (RCM), and modified RCM (RCM2). The plot sizes for RCM and RCM2 ranged from 300-700 m2. Grain yield data were gathered from a 5 m2 sampling area and converted to 14% moisture content. Results shows that in Mindanao sites, addition of 24 kg N/ha provided a 0.3 t/ha yield advantage relative to the RCM treatment and a 0.5 t/ha to that of the FP. While no significant differences on grain yield among treatments in the Luzon sites. The total amount of N applied were 66 kg/ha, 97 kg/ha, 121 kg/ha for FP, RCM, and RCM2, respectively. The reduction of 23 kg N/ha (RCM2) to that of the RCM current recommendation and the FP showed comparable grain yields. When the RCM target yield is 6t/ha, the RCM current recommendation was enough for Luzon areas in achieving the targeted yield. For the RCM target yield is 6t/ha, the reduction of N provided comparable grain yield with that of the RCM current recommendation. Although the targeted yield was not met, further studies must be conducted to ascertain the effect on grain yield of added N.
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