This study was undertaken to examine relationships between N concentrations in leaves and % N in grain at maturity, to see if the former could be used to predict the need for a topdressing of N. A grain yield of 7 t ha ha-1 -(88 % DM) combined with 1.89 % N in grain equates to a grain N requirement of 150 kg ha ha-1 -1. Chlorophyll (SPAD) readings in flag leaves at anthesis could also be used to predict % N in grain at maturity. The highest SPAD value was 45.2 for 1.89 % grain N. The SPAD meter has potential for predicting grain N requirements.
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机译：本研究进行了在成熟时叶片中N浓度和％n之间的关系，看看前者是否可用于预测N的需要7 T ha-1的谷物产量 - （ 88％DM）与1.89％n相当于谷物等于150kg HA-1 -1的粒度。在花序中的标志叶中的叶绿素（Spad）读数也可用于预测成熟度的晶粒中的％n。最高的SPAD值为45.2，对于1.89％的谷物N.PAD表具有预测谷物N要求的可能性。
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