Effects of organic fertilizer applied using the estimated mineralizable nitrogen method on nitrogen uptake, growth characteristics, yield, and yield components of Genkitsukushi rice (Oryza sativa)

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.

Keywords:

• chemical fertilizer
• estimated mineralizable nitrogen
• organic fertilizer
• rice
• yield

Disclosure statement

We have disclosed that there is no conflict of interest regarding publication of this article.

Additional information

Funding

This study was supported by the Japanese Government (MEXT) Scholarship Program 2016-2019, Japan.