Distribuição do sistema radicular do milho em terra roxa estruturada latossólica: II. Comparação entre cultura irrigada e fertirrigada

A field experiment was carried out to evaluate the distribution of irrigated maize root system in a 1 m soil layer of terra roxa estruturada latossolica (Kanduidalfic Eutrudox soil) in Piracicaba, SP, Brazil (22° 43' S, 47° 5'W), at 126 days after plant emergence. The root system exposed in trenches was filmed and the pictures processed by a system SIARCS, specially developed to analyze root system distributions. Maize root density in the 0-60 cm soil layer was higher for the case of N application to the soil, whereas for the 60-100 cm fertirrigation promoted root development. Soil water matric potential and the water storage in the soil profile presented greater changes to the 50 cm depth, showing a good relation between tensiometry, neutron probe measurements and the picture processing method.