Physiological quality of maize seeds produced under soil water deficit conditions/Qualidade fisiologica de sementes de milho produzidas sob limitacoes de agua no solo
Crop strategies focused on the rational use of water are required in semiarid regions. Thus, the objective of this work was to evaluate the physiological quality of maize seeds produced under soil water deficit conditions. Five irrigation water depth were established, based on the field capacity (10...
Saved in:
Published in | Revista brasileira de engenharia agrícola e ambiental Vol. 24; no. 7; p. 451 |
---|---|
Main Authors | , , , , , |
Format | Journal Article |
Language | English |
Published |
ATECEL--Associacao Tecnico Cientifica Ernesto Luiz de Oliveira Junior
01.07.2020
|
Subjects | |
Online Access | Get full text |
Cover
Loading…
Summary: | Crop strategies focused on the rational use of water are required in semiarid regions. Thus, the objective of this work was to evaluate the physiological quality of maize seeds produced under soil water deficit conditions. Five irrigation water depth were established, based on the field capacity (100, 85, 70, 55 and 40%), to control the available water for two maize hybrids (2B-587 and DKB-390). A randomized block design was used, with a split-plot arrangement and four repetitions. The plots consisted of irrigation water depths, and the subplots consisted of maize hybrids. The seed water concentration, germination, and vigor were determined after the harvest, using data from first germination counting, seedling emergence, germination speed index, seedling length, and accelerated aging, electrical conductivity, and modified cold tests. The maize hybrid DKB-390 showed better physiological potential under the soil water deficit conditions evaluated. The irrigation water depths lower than 70% of field capacity resulted in decreases in soil water contents and affected negatively the physiological quality of the maize seeds produced. Keywords: Zea mays L., germination, vigor, water deficit, water management Em regiao semiarida as estrategias de cultivo que visem o uso racional da agua devem ser aplicadas. Neste sentido, objetivou-se avaliar a qualidade fisiologica de sementes de milho produzidas sob limitacoes de agua no solo. Foram estabelecidas cinco reposicoes de agua no solo, baseadas na capacidade de campo (100, 85, 70, 55 e 40%), proporcionando condicoes controladas de agua para dois hibridos de milho (2B 587 e DKB 390). O delineamento experimental utilizado foi em blocos casualizados em esquema de parcelas subdivididas, com quatro repeticoes, ficando as reposicoes de agua nas parcelas e os hibridos nas subparcelas. Apos a colheita das sementes determinaram-se o teor de agua, a germinacao e o vigor (primeira contagem de germinacao, emergencia de plantulas, indice de velocidade de germinacao, comprimento de plantulas, envelhecimento acelerado, condutividade eletrica e teste de frio modificado). Para os hibridos em condicoes de restricao hidrica, o DKB 390 expressou melhor potencial fisiologico. Laminas de reposicao inferior a 70% da capacidade de campo, viabilizou a reducao de agua no solo e afetou negativamente a qualidade fisiologica das sementes de milho produzidas. Palavras-chave: Zea mays L., germinacao, vigor, deficit hidrico, manejo de agua |
---|---|
ISSN: | 1415-4366 1807-1929 |
DOI: | 10.1590/1807-1929/agriambi.v24n7p451-456 |