Jose Antonio Quaggio
IAC - Brazil
José Quaggio received his BS degree from the Universidade Federal de Lavras in 1977, and MS and PhD in Soils and Plant Nutrition from Universidade de São Paulo (USP) in 1990. He is with Instituto Agronômico (IAC), since 1978, working with chemistry and fertility of soils and mineral nutrition of plants. In his achievements we find the development of the IAC Soil Analysis System, based on the ion extraction by resins, in 1983, which is used by more than 150 laboratories in Brazil and others from Latin American countries. He also developed the method for soil liming founded on soil base saturation and has coordinated the research program on nutrient management for citrus and coffee plantations, which has resulted in recommendation guidelines for soil liming and fertilization in the Brazilian agriculture. That has also been applied to the citrus industry in Argentina, Uruguay, Panama and Costa Rica. On his academic career, he received several awards and commends in Brazil and abroad for significant contributions on nutrient management of tree crops.
Summary of lecture
Advances on citrus nutrition: 30-year of research in tropical conditions
The Brazilian production of citrus fruits represents about 18 Mt yearly. Two-thirds of that total has been delivered to the orange juice processing plants and the other portion to the fresh fruit market. The highest fruit productivities that contribute to the sustainability of the citrus industry (> 50 t/ha), besides other practices, require unexceptional nutrient management of groves, possible with information that correlate plant growth and development (e.g. fruit yield and quality), soil nutrient availability, plant nutritional status, and fertilization strategies. The long-term research program in Brazil focused several questions from soil liming to fertigation, N, P and K, as well micronutrients supply taking into account environmental characteristics of tropical soils and nutrient demand of plants on different rootstock varieties. Therefore, soil fertility and plant nutritional standards were established based on long term field experiments and soil testing calibration curves, surfaces of citrus responses to N, P and K fertilization were defined specifically for citrus, which are the current basis of nutrient management of groves in Brazil and other countries. These aspects and recent developments on citrus nutrition and fertigation will be presented during the International Citrus Congress.