Comparative Effects of Application of Coated and Non-Coated Urea in Clayey and Sandy Paddy Soil Microcosms Examined by the ^<15>N Tracer Technique : I. Effects on Growth, N Uptake, and Yield of Rice Crop(Fertilizers and Soil Amendments)

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概要

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• Nitrogen fertilizer and soil types exert an impact on plant growth. An experiment was conducted to compare the effects of application of controlled-release coated urea (CRCU) and urea on the growth of rice plants cultivated in gley (clayey) and sandy paddy soils. The ^<15>N labeled fertilizers were applied at the rate of 8 g N m^<-2> for CRCU and 10 g N m^<-2> for urea. Both soil and fertilizer types significantly influenced the plant N and ^<15>N uptake at 30 and 60 days after transplanting (DAT), with only the fertilizer type influencing the ^<15>N uptake at 90 DAT. Sandy soil and urea increased the plant N and ^<15>N uptake compared to the gley soil and CRCU at 30 DAT while the opposite was observed at 60 DAT, with CRCU inducing a higher ^<15>N uptake than urea at 90 DAT. Plant ^<15>N uptake at harvest was similar for the two types of fertilizers. Also at harvest, the average fertilizer use efficiency and proportion of unaccounted-for N for CRCU were about 74 and 25%, compared to 39 and 60% for urea, respectively. At harvest time, the total N and ^<15>N contents in the plant parts were similar between gley and sandy soils, and between CRCU and urea, respectively. Except for the harvest index and the percentage of filled grains that were significantly influenced by the soil type, there were no significant differences in the dry weight of straw, panicle, grains, and 1,000-grains between the two soil and fertilizer types at harvest. Statistically non-significant results were obtained for the two soil and fertilizer types despite the fact that the application of CRCU in gley and sandy soils increased the values of the agronomic traits by >40% compared to urea application in the two soil types. The soil type affected the agronomic traits of rice plants much more significantly than the fertilizer type applied. Even though analysis in the absence of ^<15>N tracer showed only minimal variations in the effects of CRCU and urea application on the agronomic traits of rice plants, the ^<15>N analysis revealed a significant influence of the fertilizer type on the plant ^<15>N uptake. Higher fertilizer use efficiency and a lower proportion of unaccounted-for N achieved with CRCU application resulted in a similar or in some aspects superior performance of the rice crop to that obtained with urea application, although the amount of total N applied in the CRCU treatment was 20% less than the total N amount applied in the urea treatment.

• 社団法人日本土壌肥料学会の論文

著者

• Inubushi Kazuyuki

  Laboratory of Soil Science, Faculty of Horticulture, Chiba University

• Acquaye Solomon

  Graduate School of Science and Technology, Chiba University

• Acquaye Solomon

  Graduate School Of Science And Technology Chiba University Soil Science Laboratory

• Inubushi Kazuyuki

  Laboratory Of Soil Science Faculty Of Horticulture Chiba University

• Acquaye Solomon

  Graduate School Of Science And Tech. Chiba University

関連論文

• Role of Microbial Biomass in Biogeochemical Processes in Paddy Soil Environments
• 6-10 Microbial activity and diversity in floodwater and surface soil layers of paddy fields under Free Air Carbon dioxide Enrichment (FACE)
• Comparative Effects of Application of Coated and Non-Coated Urea in Clayey and Sandy Paddy Soil Microcosms Examined by the ^N Tracer Technique : II. Effects on Soil Microbial Biomass N and Microbial ^N Immobilization(Fertilizers and Soil Amendment
• Comparative Effects of Application of Coated and Non-Coated Urea in Clayey and Sandy Paddy Soil Microcosms Examined by the ^N Tracer Technique : I. Effects on Growth, N Uptake, and Yield of Rice Crop(Fertilizers and Soil Amendments)
• Effects of slow release fertilizers on microbial biomass in submerged soil microcosms without plants(The Annual Meeting of the Society in 2001)

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