|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||Authors:||王鐘和
|Keywords:||水稻;肥料深施;穗肥;Rice;Fertilizer deep placement;Panicle fertilizer||Issue Date:||Sep-2003||Publisher:||農業試驗所||Related Publication(s):||農業試驗所特刊第105號||Start page/Pages:||105-120||Source:||水稻精準農業體系||Conference:||水稻準農業(耕)體系之研究計書成果研討會||Abstract:||
The response of rice yield to deep placement of fertilizer and nitrogen top-dressing during panicle initiation stage has been investigated, and a study to develop a simple scheme for diagnosing the demand of nitrogen top-dressing during panicle initiation stage also has been evaluated. The results are as follows. Deep placement of nitrogen fertilizer promoted nitrogen uptake, gram nitrogen and nitrogen harvest index, and resulted in a higher dry matter production, harvest index and consequently a higher grain yield of rice plant. Top-dressing of nitrogen at panicle initiation stage had favorable effects on the nitrogen uptake, dry matter production, nitrogen harvest index, harvest index and grain yield of rice plant. Nitrogen top-dressing at panicle initiation stage increased the efficiency of fertilizer-N absorption. The response of rice plants to panicle fertilizer were observed and were found well correlated with the nitrogen content in the plants during panicle initiation stage, i.e. the lower the nitrogen content in the plants the higher the response of the plants to the top-dressing. The critical nitrogen contents for obtaining positive yield response as observed were about 1.86-1.95 %. Since the chlorophyll-meter value had significantly positive relationships with both leaf N % and plant N % of rice plant at panicle initiation stage, chlorophyll meter may serve as a suitable tool for determining the necessity of top-dressing panicle fertilizer.
|Appears in Collections:||農業化學組|
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