Subtopic: Calculation of performance parameters – field capacity, efficiency, performance index, application rate and losses
Question Statement:
A seed planter dropped 100 seeds along a furrow line. The target theoretical spacing between seeds is $15\text{ cm}$. In the plant spacing analysis, 82 seed intervals fell between $7.5\text{ cm}$ and $22.5\text{ cm}$ (i.e. within $0.5 \times$ to $1.5 \times$ target spacing). Calculate the Quality of Feed Index (QFI) in percentage.
Answer Key:
82
Step-by-Step Solution & Explanation
The Quality of Feed Index (QFI) according to ISO/ASABE standards is the percentage of plant spacings that fall within $0.5 \times S_t$ and $1.5 \times S_t$ (neither multiple drops nor skips):
$QFI = \frac{n_{\text{single}}}{N} \times 100 = \frac{82}{100} \times 100 = 82\%$