Desenvolvimento inicial da cultura do milho sob diferentes níveis de água salina e matéria orgânica

Abstract

The objective of this work was to evaluate the use of organic matter in the initial growth of corn (Zea mays L) irrigated with saline water. The experiment was carried out in a greenhouse at the Agrarian Sciences Center of the Federal University of Alagoas, located in the municipality of Rio Largo, AL. The experimental design was completely randomized in a 5 x 2 factorial scheme, with four replications, being the treatments: 5 levels of salinity (0.5 (control); 1.5; 3.0; 4.5 and 6.0 dS m-1) with presence (with organic matter) and absence of material organic (without organic matter). The saline dosages were prepared and the transformed concentrations of dS m-1 to g L-1, using the formula: TSD (g L-1) = 0.64 x CEa, the preparation of the solutions were made with NaCl and distilled water. At 40 days after emergence, the plants were collected and analyzed for the number of leaves (NF), leaf area (AF-cm 2), Plant height (AP-cm), relative leaf chlorophyll index (IRC), shoot dry mass(MSPA-g) and dry mass of the root system (MSSR-g). It was found that all the variables studied in the maize crop were affected by the increase in salinity levels and that the soil in conjunction with organic matter decreased the effects of salinity.