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为了探索高产棉花各生育期的速测指标,1974～1977年,我们分别在本院试验田和南汇县泥城公社人民大队,对12块高产田和试验田,进行了较为系统的形态观察和养分速测。 (一)测定方法: 植株养分速测系采用简便易行的纸上点滴分析法。使二苯胺在强酸性条件下,被硝酸盐氧化成深蓝色醌型联二苯胺盐,比色测定NO_3~-,使磷和钼酸铵在一定酸度条件下,互相作用形成磷钼酸铵,在还原条件下变成蓝色的磷钼蓝,比色测定PO_4~≡,使钾和六硝
In order to explore the rapid measurement index of high-yield cotton in each growth period, from 1974 to 1977, we conducted systematic observation and nutrient rate in 12 high-yield and experimental fields in the experimental field of our hospital and the mud-commune people’s unit in Nanhui County, respectively Measurement. (A) determination method: Plant nutrient rapid measurement system using simple on-line analysis method on paper. Under the condition of strong acidity, diphenylamine is oxidized by nitrate to dark blue quinoid diphenylamine salt, and the colorimetric determination of NO_3 ~ - makes the phosphorus and ammonium molybdate interact with each other to form ammonium phosphomolybdate under a certain acidity condition, Under the conditions of reducing to become blue phosphomolybdic blue, colorimetric determination PO_4 ~ ≡, potassium and hexanitrate