Evaluation of atLEAF for rice leaf nutrient measurements
2015
Ramos, M.A. | Tallada, J.G.
Non-destructive in site measurements of chlorophyll contents can provide quantitative basis for the proper amount and timing of nitrogen fertilizer application to the crops. A chlorophyll meter has several advantages compared to standard laboratory testing methods such as saving time and money, and ability for repeated measurements during the growing period. The main goal of this study is to evaluate the performance of atLEAF+ and compare it to the SPAD-502+ in the field. Four rice varieties were cultured with four nitrogen levels (0, 60, 120 and 240 N kg/ha) replicated three times in split-plot randomized complete block design last dry and wet season of 2014. Chlorophyll readings were taken using SAPD-502+ and atLEAF+ starting 14 DAT until first flowering at seven days interval. Morning and afternoon measurements are highly correlated with an r=0.993 for atLEAF+ and r=1 for SPAD-502+. Comparing two operators, atLEAF+ had an r=0.791 and SPAD-502+ had r=0.991. Overall, the results indicated high correlation between SPAD-502+ and at LEAF+ readings, with an r=0.921. Therefore, atLEAF+ chlorophyll meter can perform substantially well compared to SPAD-502+ meter for leaf chlorophyll measurement at lesser investment cost.
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