Universidade Estadual do Oeste do Parana - UNIOESTE
Abstract
The use of organic fertilization can have a great contribution to the physiological and chemical aspects of plant leaves, and can be aided by the use of microorganisms that promote greater use of soil nutrients. The aim of this work was to study the gas exchange and foliar N, P and K contents of corn as a function of seed inoculation with A. brasilense associated with fertilization with poultry manage. The work was carried out in the field in two areas, with a randomized block design, in a 2x6 factorial scheme. The first factor was the inoculation of seeds with A. brasilense and control without inoculation. The second factor was six doses of poultry manage, which were defined as a function of the nutrient levels in the soil and in the poultry manage, thus using 0, 50, 100, 150, 200, 250% of the recommended dose for each area. In both areas, evaluations of gas exchange indices were carried out, such as the net CO2 assimilation rate (A), stomatal conductance (gs), leaf transpiration rate (E) and water use efficiency (WUE), as well as, analysis of nitrogen, phosphorus and potassium contents in leaves. The inoculation of corn seeds with A. brasilense significantly influenced the net CO2 assimilation rate. The doses of poultry manage had a positive influence on the potassium content of the leaves. The maximum foliar P content was reached with the dose of 5830 kg ha-1 of poultry manage.The use of organic fertilization can have a great contribution to the physiological and chemical aspects of plant leaves, and can be aided by the use of microorganisms that promote greater use of soil nutrients. In this work, the objective was to study the gas exchange and foliar N, P, and K contents of corn as a function of seed inoculation with A. brasilense associated with poultry litter fertilization. The work was carried out in the field in two areas, with a randomized block design, in a 2x6 factorial scheme. The first factor was the inoculation of seeds with A. brasilense and control without inoculation. The second factor was six doses of poultry litter, defined as a function of the nutrient content in the soil and in the poultry litter: 0, 50, 100, 150, 200, 250% of the recommended dose for each area. In both areas, gas exchange indexes were evaluated, such as photosynthetic rate (A), stomatal conductance (gs), leaf transpiration rate (E) and water use efficiency (WUE), as well as analysis of nitrogen, phosphorus and potassium in the leaves. Seed inoculation with A. brasilense decreased the photosynthetic rate of corn leaves and increased the phosphorus content in leaf biomass when compared to the control treatment. The doses of poultry litter increased the phosphorus and potassium contents of the leaves. The maximum foliar P content was reached with the dose of 5830 kg ha-1 of poultry litter
