Movement of nitrogen fertilizer across unleveed plot of lowland rice
1985
Praves Saengpetch
A rice experiment was conducted to assess the movement of nitrogen fertilizer from treated plot to an adjacent plot without nitrogen fertilizer application. This investigation was performed to ascertain effects of such nitrogen mobility on the growth, yield components and grain yield of RD 23 rice variety. The experiment was conducted at Rachaburi Rice Experiment Station. A split-split plot design was used of which two nitrogen fertilizer sources namely ammonium sulphate and urea were assigned as main plots whereas various fertilizer rates at 0, 6, 12, 18 and 24 kg.N/rai were laid in the sub-plot and the five outmost rows of each of the adjacent side in between two plots were the sub-sub plots. Each plot received a basal dressing of superphosphate and potassium chloride at the rates of 6 kg.P2O5 and 6 kg.k2O/rai. The results revealed that plant height, straw weight per row and number of panicle per hill as affected by movement of nitrogen from two fertilizer sources were not statistically significantly different. Similarly, this was also true for impact and fertilizer rates, (0,6,12,18 and 24 kg. N/rai) on plant height, number of panicle per hill, grain weight per row and grain yield. Regardless of fertilizer rates, straw weight per row and grain yield obtained from unleveed and unfertilized plots were significantly higher than those of the leveed and non-fertilizer plots. This phenomena demonstrated that fertilizer contaminations across to unleveed plots were large. Therefore, in order to avoid nitrogen fertilizer contamination between two unleveed plots, field trials on rice should be plotted out with levee
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