Jose Carlos Viera de Almeida
Technology Director of Laborsolo do Brasil
Jose Carlos Vieira de Almeida is agronomist graduated in 1979 at UNESP- Jaboticabal – SP.
MS in Plant Physiology at UFV- Vicosa_MG in 1985 and PhD in Agronomy at UEL-Londrina in 2004 . He was professor of Weed Science and Agriculture at UEL- Londrina since 1981 and retired in 2013.
He is now Technology Director of Laborsolo do Brasil where was responsible for the innovation and adoption of high technology in soil and plant analysis. Developed work for the use and adoption of DRIS diagnosis mainly in sugar cane and soybeans.
SUMMARY OF LECTURE
Nutritional Monitoring of Citrus Pants using DRIS
The citrus plants normally are some years old when they are producing fruits. As they become old, the soils where they were originally planted tend to be poor in relation to the nutrients used in the past and normally it is possible to see some decline in yield and health of the pants as they age. The 3 major macronutrients used in any crop are N, P and K. Only K is a cation and can be evaluated by soil analysis. P and N are anions and it is very difficult to be evaluated by soil analysis. The other secondary macronutrients Ca and Mg are cations , but S is an anion quite impossible to be evaluated in soil samples. In relation to micro nutrients although the major ones are cations as iron, copper, manganese and zinc, it is very difficult to evaluate in soil by the methods used to do it. In the other hand, boron and molibdenium are anions. So the soil analysis to evaluate nutrients in perennial crops is of less importance. The aim of this presentation is to show how DRIS can be used to evaluate anions and micronutrients in leaves samples to check the nutritional status of the plants and present if the nutrients can be supplied by irrigation and spraying.