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MENDOZA-TAFOLLA, R.O., JUAREZ-LOPEZ, P., ONTIVEROS-CAPURATA, R.-E., SANDOVAL-VILLA, M., ALIA-TEJACAL, I. and ALEJO-SANTIAGO, G. 2019. Estimating Nitrogen and Chlorophyll Status of Romaine Lettuce Using SPAD and at LEAF Readings. Notulae Botanicae Horti Agrobotanici Cluj-Napoca. 47, 3 (May 2019). DOI:https://doi.org/10.15835/nbha47311525.