noun
Agricultural term, especially for rice; refers to a crop that has not filled out well, resulting in low yield or poor grain quality.
今年の稔実不良は、夏の低温が原因だ。
This year's poor crop is due to the low summer temperatures.
稔実不良で収穫量が大幅に減った。
The harvest decreased significantly because of the poor crop.
不作 is a more general term for a poor harvest or crop failure, while 稔実不良 specifically refers to poor grain filling, often used in agricultural contexts.
Compound of 稔実 (ねんじつ, 'ripening of grain') and 不良 (ふりょう, 'poor, bad'). The exact historical derivation is uncertain, but the term is used in modern agricultural contexts.