En cítricos, al igual que en otros cultivos, se ha venido fertirrigando de manera tradicional en función de la experiencia, la bibliografía y de lo que "se pensaba" eran los aportes más adecuados. Para ello se utilizaban análisis de suelo y hoja. El disponer de datos dinámicos y de herramientas que permiten evaluar en continuo el sistema suelo-planta-agua, abre las puertas para regar y nutrir a la demanda de la planta, con las mínimas desviaciones y el máximo control en el manejo del cultivo

En las Empresas Citrícolas de las regiones de Jagüey Grande y Ceiba del Agua se muestrearon 83 campos de 5 especies de cítricos injertadas sobre patrón agrio con objetivo de determinar la distribución y abundancia de los géneros de nematodos fitoparásitos más frecuentes en los cítricos. Las muestras se procesaron por los métodos de centrifugación-flotación y Baermann determinándose que los géneros más abundantes fueron Helicotylenchus y Rotylenchulus en ambas regiones con independencia de la especie de cítricos. En orden de importancia le siguen los géneros Criconemoides y Xiphipema. | The distribution and abundance of nematodes parasites to citrus were studied at Jaguey Grande and Ceiba del Agua where 83 lots of five different species of Citrus were sampled. The sampled were processed by methods of centrifugation- flotation and Baerman´s technique. In both regions, regardless of the citrus species, Helicotylenchus and Rotylenchulus were the most abundant. Criconemoides and Xiphinema were also important.

[Abstract] The objective of this research was to study the porosity, bulk density and retention of water of an Oxisol, located in the Northwestern region of São Paulo state, Brazil. The soil was cultivated with Citrus sp., to which green manure was applied between rows for three years. Each of six species of green manure crops (Crotalaria junceaL., Mucunade eringian a Steph. & Bart., Canavalia ensiformis L. DC., Cajanus cajan L., Lablab purpureum L. and Ricinus communis L.) were seeded for three years (1995, 1996 and 1997) between Citrus rows, plus a treatment with a mix of all six species and a control (natural regrowth af vegetation). The experimental design was a randomized complete block design, with four replications for each of the eight treatments. Water retention, microporosity, macroporosity, total porosity and bulk density were analyzed in the beginning (1995) and end (1997) of the experiment, at three depth ranges (0-0.10; 0.10-0.20 and 0.20-0.40m). We concluded that there were statistically significant differences for bulk density, macroporosity, total porosity and retention of water among the different soil depth ranges; there were no significant differences among treatments though.