Determination of optimal nitrogen rate for rice varieties using a chlorophyll meter

By Jianliang Huang, Fan He, K. Cui, R. Buresh, Bo Xu, Weihua Gong, S. Peng. 2008

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SPAD Values and Nitrogen Nutrition Index for the Evaluation of Rice Nitrogen Status (2014, background): “(Hoel and Solhaug, 1998; Thiyagarajan, 2000; Peng et al., 2006; Esfahani et al., 2008; Huang et al., 2008; Li et al., 2011).”
Yield potential and radiation use efficiency of “super” hybrid rice grown under subtropical conditions (2009, background): “Huang et al. (2008) determined the N response of Liangyoupeijiu and Shanyou 63 over a wide range of N rates (60–410 kg ha 1) in Hubei Province, China.”
Improving Nitrogen Fertilization in Rice by Site-Specific N Management (2011, methodology): “For example, SPAD thresholds of 35–37 were used for indica varieties and they were 2 units higher for japonica varieties ( Huang et al., 2008 ).”
Improving nitrogen fertilization in rice by sitespecific N management. A review (2010, methodology): “For example, SPAD thresholds of 35–37 were used for indica varieties and they were 2 units higher for japonica varieties (Huang et al., 2008).”