Solophos fertilizer improved rice plant growth in aerobic soil
Yield decline of continuous monocropping of aerobic rice is the major constraint to the wide adoption of aerobic rice technology. This study was conducted to determine if solophos fertilizer could be used to reverse the yield decline of this cropping system using pot and micro-plot experiments. The soil for the pot experiment was collected from a field where aerobic rice has been grown continuously for 11 seasons at the IRRI farm. Four rates (4, 6, 8, and 10gpot^<-1>) of solophos application were used in the pot experiment. Micro-plots (1×1m) were installed in the field experiment where the 12^<th>-season aerobic rice was grown. Treatments in the micro-plots were with and without additional solophos application. Solophos rate was 4, 407.5kg ha^<-1> which was equivalent to 10g solophos pot^<-1> used in the pot experiment. An improved upland variety, Apo, was used for both pot and micro-plot experiments. Application of solophos significantly increased plant height, stem number, leaf area, chlorophyll meter reading, root dry weight, and total biomass in the pot experiment. The growth en-hancement by solophos application was also observed in the micro-plot experiment under the field conditions. Photosynthetic rate and spikelet number per m^2 were increased by solophos application in the micro-plot experiment. Although the mechanism of growth promotion by solophos application is not clear, this study suggested that solophos application could be used as one of crop management options that could minimize the yield decline of continuous monocropping of aerobic rice.
- Journal of integrated field science
Journal of integrated field science 4, 65-70, 2007-03-01
Field Science Center, Graduate School of Agricultural Science, Tohoku University