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São apresentados os resultados do estudo do desenvolvimento do sistema radicular de arroz das variedades Iguape Agulha e IAC-435, em dois métodos de plantio, em solos das séries Barro de Telha e Coruputuba, do Vale do Paraíba, SP. Em solo da Série Barro de Telha, nos métodos de plantio considerados - semeação direta e transplantio de mudas - as raízes da var. Iguape Agulha atingiram 55 cm de profundidade, em ambos os casos localizando-se 86% do total na camada superficial de 15 cm do solo. Na Série Coruputuba, as raízes das plantas da var. IAC-435 atingiram 75 cm de profundidade, em ambos os sistemas de plantio, sendo que no de semeação direta 86% das raízes concentraram-se nos 15 primeiros cm do solo, e no do transplantio das mudas, 81%. The development of the root system of two rice varieties, Iguape Agulha and IAC-435, planted either by direct sowing in rows or by seedling was studied in soils of the series «Barro de Telha» and «Coruputuba» under irrigation and drainage systems during the years 1967/68 and 1968/69. Individual plants of the variety Iguape-Agulha planted by direct sowing in rows produced 71.5 g of roots; 86% of the root weight were concentrated in the first 15 cm of the soil. When planted by seedling the root system weighed 40.3 g, 86% of which were concentrated in the upper 15 cm of the soil. The root system reached the depth of 55 cm. The variety IAC-435 planted by direct sowing in rows yielded 109.7 g of roots, 86% of which were found in the first 15 cm of the soil. When planted by seedling it weighed 69.8 g, 81% of which were concentrated in the upper 15 cm of the soil. The maximum depth reached by these roots was 75 cm

Desenvolvimento do sistema radicular do arroz semeado diretamente e plantado por mudas, em duas séries de solo do Vale do Paraíba, SP