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• W2497768078 abstract "In the Colombian’s coffee zone the studies about indicators to determine the concentration of nitrogen in trees of coffee are limited. Currently, to arrive to this determination, the Kjendahl technique is employed which requires specialized equipment, an excessive investment of reactives and a high cost of analyses, this is why this technic presents negative environmental and economic impacts. In order to contribute with this knowledge, the aim of this research was to determine the viability to use a mobile sensor of index spectral (SPAD-502) like indicator of nitrogen’s concentration in coffee trees. In this way, there were selected two regions of the Colombian’s coffee zone (Experimental Naranjal Station in the municipality of Chinchina – Caldas, and the Experimental Paraguaicito Station in the municipality of Buenavista – Quindio) in which there were coffee plots cultured with Castillo® variety in productive phase over free solar exposition. In this lands there were applied three sources of nitrogen [Urea, Nitrate of ammonia and urea + DMPP (inhibitor of the nitrification)], and of each source three doses (200, 300 y 400 kg. kg.ha-1.ano-1), in addiction it was a treatment without application of N. The effect of the treatments over the foliar nitrogen’s concentration (NF) and the unities SPAD was evaluated under the experimental design of randomized complete blocks. In the months of June 2011 and May 2012 in each locality, there were taken composite samples of foliar tissue in the leaves that were in productive branches of the upper third of the trees, and in the pair of leaves of each branch, where measurements were also taken with SPAD, and where coffee production was concentrated. In both locations, no significant effect of nitrogen sources used was presented, neither of the interaction source by dose on the SPAD readings, but significant effect of N dose employed was evident. With all the information above, it was obtained an explanatory model of the relationship between SPAD units and foliar nitrogen; in this sense, simple linear regression between SPAD reading and concentration of NF for both locations was performed. In Naranjal, the model presented a quadratic trend where the minimum estimated value of NF (%) was found in the prediction interval of 1.41:2.07 for a SPAD reading of 61.9, while the estimated maximum value of NF (%) was found in the range of 2.25 to 2.8 for a SPAD reading of 74.6 units. In Paraguaicito, the model presented a linear trend, with a coefficient of determination R2 very low (0.08), for that reason it was interpreted that the model can be useful to know the trend of foliar N response with respect to the SPAD reading, but inappropriate to make statistical predictions in this location specifically. Overall it was concluded that for the conditions of the study, the SPAD has potential to detect severe deficiencies of N in the absence or with application of low doses of the same (200 ˂ kg.ha.-1year-1); but impede predict the luxury consumption of the plant and if the nitrogen is applied excessively." @default.
• W2497768078 created "2016-08-23" @default.
• W2497768078 creator A5053299420 @default.
• W2497768078 date "2014-01-01" @default.
• W2497768078 modified "2023-09-27" @default.
• W2497768078 title "Evaluación del dispositivo portátil SPAD-502 como indicador de la concentración de nitrógeno en plantas de café coffea arabica" @default.
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