the field experiments were conducted for two consecutive growth seasons using spad-502 chlorophyll meter to quantitate the maturity of fresh flue-cured tobacco leaf.
利用spad-502叶绿素计进行了连续两年的田间试验,研究了烤烟鲜烟叶的成熟度量化判别。
chlorophyll meter spad-502 should be used broadly in forestry research because of its convenience to carry, simple and rapid measurement, and no damage to leaves.
由于叶绿素计spad-502携带方便、测定简便、迅速,且不损坏叶片,应在林业研究中积极推广使用。
as an instrument of measuring the chlorophyll content, the chlorophyll meter can also be used in measuring the nitrogen content of crop, and it is rapid, accurate, and convenient for this use.
the first common approach is to set up threshold values at important growth stages and then compare the measured chlorophyll meter values with the threshold values.
其中一个常用的办法是:在作物生长的关键时期设定一个界线值,与原来的丈量值做出比拟;
use the spad-502 chlorophyll meter to rapid, on-farm analysis crop chlorophyll status and nitrogen fertilizer recommendation.