Use of Chlorophyll Meter Sufficiency Indices for Nitrogen Management of Irrigated Rice in Asia

By F. Hussain, Kevin F. Bronson, Yadvinder-Singh, Bijay-Singh, S. Peng. Agronomy Journal, 2000

205 citations recorded by the source corpus.

Low N fertilizer recovery efficiency (RE) remains a problem in rice (Oryza sativa L.) production in Asia. The chlorophyll meter has been shown to identify when rice is in need of a N top-dressing, that if applied would result in greater agronomic efficiency (AE) of N fertilizer than commonly practiced, pre-set timing schemes. Critical chlorophyll meter readings have been used to match N top-dressing with plant demand for the cultivar IR72, but fixed critical readings may not apply to multiple cultivars and locations. Our objective was to test the approach of using sufficiency indices, calculated from chlorophyll meter readings relative to well-fertilized reference plots, with several rice cultivars in the Philippines and in India by comparing with local fixed N timing recommendations. Chlorophyll meter readings were significantly affected by N management practice, cultivar, and time of application at both locations. Similar rice yields were produced with chlorophyll meter sufficiency indices compared with the fixed N timing treatment with 30 kg less N ha -1 in the wet season in all cultivars at both locations. Compared with fixed-timing, 45 kg less N ha -1 was used with the chlorophyll meter in the Philippines dry season without a yield reduction in three of four cultivars. In conclusion, chlorophyll meter sufficiency indices identified when several rice cultivars at two locations needed a N top-dressing, which resulted in greater AE of N fertilizer than local, pre-set splits.

Subfields: Biomedical Engineering, Plant Science, Soil Science

View Paper: https://www.semanticscholar.org/paper/10a562e57bfd59c5641ba868a2066c70eaa923ad

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In Biomedical Engineering

H. Torbert

In Plant Science

In Soil Science

Citations in the corpus

Need based nitrogen management using the chlorophyll meter and leaf colour chart in rice and wheat in South Asia: a review (2010, methodology): “a Grain yields under SPAD based N management and with blanket recommendation did not differ significantly by student’s t-test irrespective of year and cultivar (Adapted from: Bijay-Singh 2008; Hussain et al. 2000)”
Nitrogen Response in Cotton as Affected by Tillage System and Irrigation Level (2001, background): “…fall, high winds, and a relatively short growing season. in-season measurements with the chlorophyll meter, Water, N, and growing season length are the most lim- which measures greenness of the leaf (Varvel et al., iting factors of cotton production in this region where 1997; Hussain et al., 2000).”
Evaluation of SPAD and LCC based nitrogen management in rice ( Oryza sativa L.) (2010, methodology): “method (Hussain et al., 2000).”
FIELD EVALUATION OF THE RELATIONSHIP BETWEEN CHLOROPHYLL CONTENT IN BASIL LEAVES AND A PORTABLE CHLOROPHYLL METER (SPAD-502) READINGS (2010, background): “…and indirect estimation of the nutrient because much of nitrogen is incorporated in chlorophyll (Filella et al., 1995; Hoel and Solhaug, 1998; Samdur et al., 2000; Moran et al., 2000; Hussain et al., 2000; Singh et al., 2002; Giunta et al., 2002; Wang et al., 2004; van den Berg and Perkins, 2004).”
SPAD Values and Nitrogen Nutrition Index for the Evaluation of Rice Nitrogen Status (2014, methodology): “Varvel et al. (1997) and Hussain et al. (2000) used SPAD Sufficiency Index to overcome the influence of varieties, developmental stages and locations on SPAD measurements.”