Effects of organic fertilizer applied using the estimated mineralizable nitrogen method on nitrogen uptake, growth characteristics, yield, and yield components of Genkitsukushi rice (<i>Oryza sativa</i>)
Kyi Moe, Aung Zaw Htwe, Doan Cong Dien, Yoshinori Kajihara, Takeo Yamakawa
Abstract
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.