Uptake Process and Recovery of co-situs Applied Polyolefin-Coated Urea as Affected by Release Pattern on Corn (Zea mays L.) under Humid Climate in Northeastern Japan(Plant Production Science Soil Science)
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概要
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Two years of field experiments were conducted to (i) determine dent corn (Zea mays L.) growth and nitrogen (N) uptake from split-dressed urea, co-situs applied polyolefin-coated urea with linear (POCU-70) and sigmoidal (POCU-30+S60) release using the ^<15>N tracer method, and (ii) compare the uptake process and the recovery of co-situs applied POCUs in 1994 and 1995 at the Kawatabi Experimental Station of Tohoku University, located in northeastern Japan. The differences in the dry-matter production and total N uptake among the N sources were very small. However, the dry-matter production in 1994 is significantly higher than in 1995 due to unusual low rainfall and rich sunshine. During the early growth stage, the relative recoveries of POCU-70 and POCU-30+S60 were low, but already significantly greater than that of urea. After the middle growth stage, POCU-S60 was recovered higher than the others. The recoveries of POCU-S60 gradually increased from 55% of dissolved N during the middle growth stage to 72% at the harvest, where those of POCU-70 increased from 30 to 61%. At the end of the growing season, the recoveries of urea, POCU-70 and POCU-30+S60 were 51, 61 and 70%, respectively. The significant difference in years and the interaction among the N source and year were caused by the low recovery of urea that appeared in 1995 due to normal rainfall. The better synchronization between the N dissolution from POCU-S60 and N requirement by corn would increase the recovery of the POCU-30+S60 treatment and contribute to the lower susceptibility to yearly variations in climate.
- 東北大学の論文