%0 Journal Article
%T Predicci車n de la variabilidad del rendimiento de papa a partir de la cobertura del follaje Predicting potato yield variability from foliage cover
%A A. de la Casa
%A G. Ovando
%A L. Bressanini
%A J. Mart赤nez
%J Agriscientia
%D 2012
%I 
%X La cobertura del follaje (f) es un par芍metro biof赤sico importante para determinar tanto la fracci車n de radiaci車n fotosint谷ticamente activa interceptada (fRFAI), como la tasa de agua que transpira un cultivo. En cultivos de papa (Solanum tuberosum L., cv. Spunta) de ciclo oto al se analiz車 en 2009 y 2010 la relevancia de f y fRFAI, para estimar el rendimiento y evaluar la variabilidad productiva espacial en un lote del cintur車n verde de la ciudad de C車rdoba, Argentina. Si bien fRFAI present車 mayor capacidad para explicar la variabilidad del rendimiento de tub谷rculo a cosecha, el empleo de la duraci車n de la cobertura, f acumulada hasta los 60 d赤as de la plantaci車n, en 2009 alcanz車 un R2 de 0,77 (P < 0,01), valor que aument車 a 0,95 en 2010 a los 70 d赤as de la plantaci車n a partir de un muestreo m芍s intensivo. El empleo de un 迆nico valor de f obtenido pr車ximo a cobertura m芍xima reduce la capacidad predictiva respecto de los valores acumulados. A partir de una grilla de muestreo de 5x5, en 2009 se constat車 que existe un componente significativo de la variabilidad asociada a la estructura de plantaci車n por surcos. The ground cover (f) is an important biophysical parameter to determine both the fraction of intercepted photosynthetically active radiation (fRFAI), and the rate of water that is transpired by a crop. During the autumn/late growing seasons of 2009 and 2010, the potential of f and fRFAI to estimate potato yield (Solanum tuberosum L., cv. Spunta), and to evaluate the spacial variability of production in a plot of the green belt of Cordoba, Argentina, was discussed. While fRFAI showed greater ability to explain the variability of tuber yield at harvest, using ground cover duration, the f accumulated until 60 days after planting reached an R2 of 0.77 (P < 0.01) in 2009, which increased to 0.95 in 2010 70 days after planting from a more intensive sampling (f was obtained from an average of nine photographs taken at 2.5 m height). The use of a single value of f obtained near maximum coverage reduces the predictive power of cumulative values. Based on a 5x5 grid sampling in 2009 it was found that there is a significant component of the variability associated with furrow planting.
%K Papa
%K Fracci車n de cobertura
%K Duraci車n de la cobertura
%K Predicci車n de rendimiento
%K Variabilidad espacial
%K Potato
%K Ground cover
%K Duration of ground cover
%K Yield prediction
%K Spatial variability
%U http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1668-298X2012000100002