The nitrogen (N) uptake, growth characteristics, and yield of the Genkitsukushi rice variety were evaluated over 2 years (2017 and 2018) of field experiments involving the application of poultry manure (PM), cow manure (CM), and compost (CP). Organic fertilizers were quantified as the estimated-mineralizable-nitrogen (EMN) based on the total N content. Compared with chemical fertilizer (CF100), CF50PM50 resulted in greater growth characters, N uptake, dry matter, and yield in both years. The PM (total N > 4%) had a higher N mineralization, a greater N availability to rice and thus, a greater contribution to yield. More N was available from CM and CP containing ∼2% of total N in the second year. In conclusion, an organic fertilizer with a higher total N (>4%) was compatible with the EMN method and let to increase N availability and yield of Genkitsukushi japonica rice.
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