Agricultural crops have phenological stages that are less susceptible to soil water deficit, in which the deficit irrigation management strategy can be used, in order to maximize production per unit of water applied. In this context, the objective was to evaluate the productive characteristics of two soybean cultivars (NS 8397 and J003) under irrigation with controlled deficit in the different stages of development. The experimental design adopted was randomized blocks in a split plot scheme, with sixteen treatments and three replications. The treatments considered plots, consisted of the applications of the imposition or not of the water deficit (50 and 100% of ETo) in different stages of development and in the subplots the cultivars. Controlled deficit irrigation caused changes in all production components, except for the number of branches. The productive components of the soybean crop (height of insertion of the first pod, number of pods per plant, number of grains per plant and the total productive potential) obtained better responses, mainly when irrigated with an irrigation blade referring to 100% of the ETo during the phenological stage I. The controlled water deficit (50% of ETo) applied, mainly, in the flowering and grain filling phases in the soybean crop, caused drastic decreases in the productive components (number of pods per plant, number of grains per plant and total productive potential). The cultivar NS 8397 proved to be more adapted and tolerant to the water deficit conditions imposed, being, therefore, more recommended for cultivation in the Cerrado region of southern Piauí.

CRESCIMENTO VEGETATIVO DA MORINGA EM DISTINTOS REGIMES DE IRRIGAÇÃO ASSOCIADOS A COMPOSIÇÕES DE DIFERENTES SUBSTRATOS     VALDIR MOURA DE OLIVEIRA JUNIOR1; THAYS SOUSA LOPES1; JOÃO VALDENOR PEREIRA FILHO1; JAILDO RIBEIRO BARBOSA1; ROBERT WILLIAM FERREIRA SOARES1; CARMEM CRISTINA MARECO DE SOUSA PEREIRA2   1Centro Integrado de Ensino Superior, Universidade Estadual do Piauí (UESPI), Rua Almir Benvindo, s/n, bairro Aeroporto, 64860-000, Uruçuí, Piauí, Brasil. valdirjunior@aluno.uespi.br; thayslopes@aluno.uespi.br; joaovaldenor@urc.uespi.br; jaildobarbosa@aluno.uespi.br; robertsoares@aluno.uespi.br 2 Departamento de Engenharia Agrícola, Universidade Federal Rural de Pernambuco (UFRPE), Rua Dom Manuel de Medeiros, s/n - Dois Irmãos, 52171-900, Recife, Pernambuco, Brasil. crismareco@hotmail.com     1 RESUMO   A moringa possui ampla adaptabilidade e se condiciona, com muita facilidade, ao clima e solo do Nordeste brasileiro. Ainda são escassas as informações sobre a produção de mudas desta espécie sob composições de substratos associados a regimes de irrigação. Desta forma, o objetivo desse trabalho foi caracterizar o comportamento vegetativo de plantas de moringa submetidas a distintas composições de substratos e regimes de irrigação. O experimento foi realizado em ambiente telado, no período de setembro a outubro de 2020, na área experimental da Universidade Estadual do Piauí, Uruçuí. Adotou-se um delineamento experimental em esquema fatorial, sendo, o primeiro fator, dois regimes de irrigação (50 e 100% da ETo) e o segundo fator, cinco substratos (SB1 = latossolo vermelho; SB2 = substrato comercial; SB3 = solo + esterco; SB4 = solo + cinza vegetal; SB5 = solo + borra de café), com 5 repetições. Aos 45 dias após a semeadura (DAS) foram avaliadas a altura de plantas e o diâmetro do caule. Os parâmetros de crescimento inicial da cultura da moringa foram afetados significativamente pela interação (regimes de irrigação x substratos), sendo os melhores resultados obtidos, na maioria dos substratos utilizados, com a aplicação do regime hídrico de 100% da ETo.   Palavras-chave: Moringa oleifera Lam, produção de mudas, déficit hídrico.     OLIVEIRA JUNIOR, V. M.; LOPES, T. S.; PEREIRA FILHO, J. V.; BARBOSA, J. R.; SOARES, R. W. F.; PEREIRA, C. C. M. S. VEGETATION GROWTH OF MORINGA IN DIFFERENT IRRIGATION REGIMES ASSOCIATED WITH COMPOSITIONS OF DIFFERENT SUBSTRATES     2 ABSTRACT   Moringa has wide adaptability and is very easily conditioned to the climate and soil of northeastern Brazil. Information on the production of seedlings of this species under compositions of substrates associated with irrigation regimes is still scarce. Thus, this work aimed to characterize the vegetative behavior of moringa plants submitted to different compositions of substrates and irrigation regimes. The experiment was carried out in a screened environment, from September to October 2020, in the experimental area of ​​the State University of Piauí, Uruçuí. An experimental design was adopted in a factorial scheme, the first factor being two irrigation regimes (50 and 100% of ETo) and the second factor, five substrates (SB1 = red oxisol; SB2 = commercial substrate; SB3 = soil + manure; SB4 = soil + vegetable ash; SB5 = soil + coffee grounds), with 5 repetitions. At 45 days after sowing (DAS), plant height and stem diameter was evaluated. The initial growth parameters of the moringa crop were significantly affected by the interaction (irrigation regimes x substrates), with the best results obtained, in most of the substrates used, with the application of the water regime of 100% of ETo.   Keywords: Moringa oleifera Lam, seedling production, water deficit.