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Annual Changes in Soil Nitrogen and Microflora In Paddy Fields not Fertilized Long-term and Fertilized Paddy Fields*
Mem. Fac. Agr. Kinki Univ
Synopsis From 1987 to 1989, we measured changes in soil nitrogen and microflora in two kinds of paddy fields, one not fertilized for 40 years and one fertilized regularly. 1) The soil total-N content was significantly higher in the fertilized field (F-field) than in the non-fertilized field (r- ;-F-field) ; in both fielis, the content increased from starting in the maxi mum-tillering stage until the heading and flowering stage, then temporarily decreased in the middle growing stage, and thenfatcat:7ek7yhvwyfcl7hp4vlpxddtlpq