|Title:||改進肥效及增進土壤氮素肥力以提高二期稻作產量之研究||Other Titles:||Increasing Yield; of the Second Crop Rice with Improvement of Fertilizer Efficiency and Sail Nitrogen Fertility||Authors:||莊作權
|Issue Date:||Dec-1984||Publisher:||農業試驗所||Related Publication(s):||稻作區域性與期作性低產及增產措施之研究||Start page/Pages:||1-16||Source:||農業試驗所特刊;第16號||Abstract:||
Increase of N recovery % and grain yield upon USG deep placement, the first rice crop was superior than the second rice crop. For the first rice crop, grain yield increased up to 13%, while N recovery increased up to 77%. However, it was found grain yield of the second rice crop only increased about 3% at Pingtung Experiment Site, while the N recovery rate increased about 41%, lower than that of the first crop by 36%.
The effect of USG deep placement on grain yield and N recovery rate may be relatedto existing of expanding clay minerals in soils. As higher amount of expanding clay minerals in Taichung soil, grain yield increased by 18% and N recovery rate increased from 30% to 71%. At Pintung Experiment Site, the soil contains no expanding clay minerals, grain yield only increased by 3% and N recovery rate also increase from 8% to 41%. Increasing the fertilizer efficiency of USG deep placement may be partly attributed to the higher ammonium adaptive nature due to the existence of expanding clay minerals in soils This may explain why higher N recovery rate of USG deep placement at Taichung site and lower at Pingtung site
Application of rice husk increased not only withe increasing N recovery rate but also increased with uptake of N and K by rice plant. As respond to the grain yield, it increased about 9% for the second rice crop, and 4% for the first rice crop in general. The use of rice husk also depressed banded sclerotial disease of rice plant which in turn increased grain yield by 9% at Changhua Site.
Based on our results, response of grain yield increase by application of rice husk was much significant than the use of slag. In Pingtung, use of slag even caused slightly yield decline. But with use of slag combined with rice husk, it significantly reduced the tendency of grain yield decline.
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