RESUMO A aplicação da manipueira, resíduo liquido do processamento da mandioca, em cultivos agrícolas apresenta-se como uma boa alternativa como fonte de nutrientes para as plantas. Nesta perspectiva o objetivo desta pesquisa foi analisar o crescimento e a produtividade de plantas de girassol adubadas com manipueira. O delineamento experimental utilizado foi em blocos ao acaso, com seis doses de manipueira (0; 8,5; 17; 34; 68 e 136 m3ha-1) em quatro repetições, sendo avaliados em seis épocas de amostragens das plantas (15, 30, 45, 60, 75 e 90 dias após a semeadura - DAS), utilizando-se a cultivar de girassol, Helio 250. As variáveis avaliadas foram a área foliar, o índice de área foliar, a razão de área foliar, a área foliar específica, a razão de peso foliar, a massa seca da parte aérea das plantas e a produtividade. A dose de manipueira igual a 136 m3 ha-1 propiciou maiores produtividade, área foliar, índice de área foliar e massa seca da parte aérea. Os menores valores de razão de área foliar, área foliar específica e a razão de peso foliar foram obtidos quando se utilizou a dose de 136 m3 ha-1. | ABSTRACT Cassava wastewater is the liquid residue of the cassava flour processing and its application to the soil as fertilizer for agricultural crops is a good alternative to sources of nutrients for plants. In this context, the objective of this work was to evaluate the growth and seed yield of sunflower on soil fertilized with cassava wastewater. A randomized block experimental design with four replications was used, with six cassava wastewater rates (0, 8.5, 17, 34, 68 and 136 m3 ha-1) and six plant sampling times (15, 30, 45, 60, 75 and 90 days after sowing), using the sunflower cultivar Helio-250. The evaluated variables were total leaf area, leaf area index, leaf area ratio, specific leaf area, leaf weight ratio, shoot dry mass and sunflower seed yield. The use of cassava wastewater rate of 136 m3 ha-1 increases the seed yield, leaf area, leaf area index and shoot dry mass, and results in lower leaf area ratio, specific leaf area and leaf weight ratio of sunflower (cv. Helio-250) crops.

Cassava wastewater is the liquid residue of the cassava flour processing and its application to the soil as fertilizer for agricultural crops is a good alternative to sources of nutrients for plants. In this context, the objective of this work was to evaluate the growth and seed yield of sunflower on soil fertilized with cassava wastewater. A randomized block experimental design with four replications was used, with six cassava wastewater rates (0, 8.5, 17, 34, 68 and 136 m3 ha-1) and six plant sampling times (15, 30, 45, 60, 75 and 90 days after sowing), using the sunflower cultivar Helio-250. The evaluated variables were total leaf area, leaf area index, leaf area ratio, specific leaf area, leaf weight ratio, shoot dry mass and sunflower seed yield. The use of cassava wastewater rate of 136 m3 ha-1 increases the seed yield, leaf area, leaf area index and shoot dry mass, and results in lower leaf area ratio, specific leaf area and leaf weight ratio of sunflower (cv. Helio-250) crops.