Grain weight per spike的用法和樣例：
例句
- Results showed that a total of nine QTLs controlling grain weight per panicle were detected in two environments.
上位性是控制水稻單穗粒重遺傳變異的一個重要的遺傳組分。 - The maximal spike position for individual grain weight of spikelet was lower than the maximal spike position for grain weight of spikelet.
平均單粒重隨氮肥水平的增加先增加后減少，小穗單粒重最大的穗位低於小穗粒重最大的穗位。
