Effect of plant spacing and early use of non optimal N fertilizer management at panicle initiation for irrigated rice grown on puddled and non-puddled soils
2016
Girsang, S.S.
The experiment was conducted at the Experiment Station of the International Rice Research Institution (IRRI) in Los Baños, Laguna, Philippines during the dry season of 2014/2015. It aimed to determine the effect of plant spacing and early use of N fertilizer on N fertilizer management at panicle initiation on puddled (UY site) and non-puddled (UE site) soils. The study also examined other factors such as tiller number, LAI, leaf color, and whether or not information can be used in adjusting N fertilizer at panicle initiation. The treatments were arranged in a randomized complete block design with four replications. The treatments were factorial combination of two plant spacing (0.3 m x 0.133 m and 0.2 m x 0.2 m) and four N management practices which were of two N treatments at early N and two panicle initiation (low is 35 kg N/ha in UY and 45 kg N/ha in UE, high is 60 kg N/ha in UE high in 60 kg N/ha in UY and 70 kg N/ha in UE). No significant difference was observed on plant performance as affected by two plant spacings (0.2 x 0.2 m and 0.3 x 0.133 m) for both sites, but the latter (that is, 0.3 x 0.133 m), obtained higher results in puddled soil and the former (0.2 x 0.2 m) in non-puddled soil. The recommendation was high nitrogen N at early and low N at panicle initiation (PI). Moreover, even high N rate applied early and low at PI has higher NUE than high N rate applied at early and at PI, the first treatment obtained up to 82% yield potential in puddled soil and 39% in non-puddled soil. As for the latter treatment, 84% of the yield potential in UY site was obtained and 45% in UE site. The former can save 25 kg N/ha in 2014/2015 DS.
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