The effects of different soil N supply on SPAD chlorophyll meter readings and plant sap nitrate concentration were studied for winter at shooting stage. By study the correlation between SPAD chlorophyll meter reading and sap nitrate concentration with soil Nmin, and total N content, the accuracy of the two plant N status diagnosis methods were studied. It is showed that the two methods could predict the winter wheat N status conectly, and the plant sap nitrate test is a better method than SPAD chlorophyll meter test. The SPAD chlorophyll meter could be used to as a plant N status diagrosis tool, and could be used in N fertilizer recommendation.
JIA Liang-liang
,
CHEN Xin-ping
,
ZHANG Fu-suo
. The Comparision of Spad Chlorophyll Meter and Sap Nitrate Test as N Diagnosis Methods for Winter Wheat[J]. Acta Agriculturae Boreali-Sinica, 2007
, 22(6)
: 157
-160
.
DOI: 10.7668/hbnxb.2007.06.032
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