At earing stage P-resistant genotypes, compared to P-sensitive ones, have higher accumulation of Pin upper leaves. 孕穗期，玉米自交系耐低磷特性主要体现在上部叶磷累积量较高，能保证玉米后期正常生长发育。
Based on tobacco company evaluations of upper-stalk tobacco from these trials, ripeness and separation of the uppermost leaves had the greatest effect on tip grade production. 根据烟草公司对来自从这些试验的上部烟叶的评估，成熟度和最上部叶的分次采收对顶叶等级的产生影响最大。
