过去生产上通常用籽粒“黑层”或种子水分测定来确定玉米是否成熟.美国肯塔基大学的研究者在应用放射性二氧化碳的试验中发现“乳线”(籽粒中乳质部分与坚硬部分的分界线,译者注)是判定玉米籽粒成熟的很好指示物.研究者让植株吸收放射性二氧化碳后,这些二氧化碳就被转化成放射性糖,然后转运到籽粒中去.当放射性糖在籽粒中急剧下降时, In the past, grain / black layer or seed moisture was used to determine the maturity of maize. Researchers at the University of Kentucky found that the “milk line” (milk part and hard Part of the demarcation line, the translator’s note) is a good indicator of maize grain maturity researchers let the plants absorb radioactive carbon dioxide, these carbon dioxide is converted into radioactive sugar, and then transported to the grain to go when the radioactive sugar in the grain In sharp decline,