|Title:||肥料深施及穗肥對水稻產量之效應及診斷研究||Other Titles:||Response of Rice Yield to Deep Placement of Fertilizer and Nitrogen Top-dressing during Panicle Initiation Stage and Its Diagnosis of Fertilizer Application||Authors:||王鐘和
|Keywords:||水稻;肥料深施;穗肥;Rice;Fertilizer deep placcmcnt;Panicle fertilizer||Issue Date:||Oct-2004||Publisher:||台灣農業化學會與台灣食品科學技術學會||Journal Volume:||42||Journal Issue:||5||Start page/Pages:||383-395||Source:||台灣農業化學與食品科學||Abstract:||
Field experiments were conducted to examine the effect of deep placement of fertilizer and nitrogen top dressing on rice yield and to develop a simple method for diagnosing the level of nitrogen (N)top-dressing during panicle initiation stage. The results showed that deep placement of nitrogen fertilizer promoted nitrogen uptake, grain nitrogen and nitrogen harvest index, resulted in a higher dry matter production, harvest index, and a higher grain yield of rice plant as compared with conventional nitrogen application. Similarly, top-dressing of nitrogen at panicle initiation stage also increased nitrogen uptake, dry matter production, nitrogen harvest index, harvest index, and grain yield of rice plant. Furthermore, nitrogen top-dressing at the stage significantly increased the efficiency of fertilizer-N absorption. Analyses of canonical correlations of rice response to panicle fertilizer revealed that nitrogen concentration of rice plant and panicle fertilizer dosage were highly correlated i.e. the lower nitrogen concentration in the plant, the higher response of the plant to the top-dressing. The critical nitrogen concentration of rice plant were under 18.6-19.5 g/kg for positive response of rice yield. The chlorophyll-meter value was significantly positively associated with both leaf N conecetration and rice plant N concentration at panicle initiation stage. Consequently, detection of chlorophll concentration using chlorophyll-meter would be a good tool for determining the essential dosage of top-dressing panicle fertilizer.
|Appears in Collections:||農業化學組|
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