Relationship between Variation of Weather and Recovery Rate of Rice Plants in Non-Tillage Culture by Single Application of Fertilizer in Nursery Boxes

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  • 育苗箱全量施肥による不耕起移植水稲における窒素の利用率と気象変動の関係
  • イクビョウバコ ゼンリョウ セヒ ニヨル フ コウキ イショク スイトウ ニ

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Abstract

The recovery from coated urea-N after contact with seedling roots in nursery boxes was very high. The effect of weather on absorption of coated urea-N and the recovery rate of rice plants in the non-tillage rice culture was investigated. The soil type was a gley soil with poor drainage. The results were as follows: 1) The relationship between accumulative release rate of total N from coated urea and cumulative soil temperature was similar in each year. 2) The accumulative release rate of total N from coated urea corresponded to the growth stage of rice plants in each year under different weather conditions. 3) In 1993 under low temperature conditions, the absorption from coated urea-N by each growth stage of rice was almost equal to that in 1992 under common condition. 4) In 1993, the absorption from soil N at the panicle formation stage and reduction division stage was lower than that in 1992. 5) The recovery from coated urea-N at the maturing stage of rice plants was 79% in 1992 and 81% in 1993. The recovery of rice plants from coated urea-N at the maturing stage was remarkable high and its variance was small. It is concluded that annual changes of absorption from coated urea-N are very small and the recovery rate of rice plants after single application of fertilizer in nursery boxes is remarkably high under different weather conditions.

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