Produção massa seca de aveia preta e de grãos de milho, com e sem nitrogênio, em solo submetido a doses de calcário e cama de aves

Abstract

The production of broilers is expressive in Paraná, generating a very large amount of a residue called chicken litter that is rich in nutrients, especially nitrogen. Limestone has the function of increasing soil pH and, together with poultry litter, can become a soil fertility management strategy. The objective of this work was to evaluate the responses of oat and corn plants to limestone, poultry litter and nitrogen fertilization in cover. For this, a long-term experiment was started, which started in 2011. In 2015, increasing doses of limestone (0, 2, 4 and 8 t ha-1) were applied to the main portions of the experiment (a single application). Annually, prior to winter culture, increasing doses of poultry litter (0, 4, 8 and 12 t ha-1) (on a wet basis) are applied and constitute the subplots. The experiment is conducted in a randomized complete block design with split plot (black oat) and subsubotate plot (maize) and four replications. In the summer, a new subdivision of the subplots was performed to receive or not the application of N in coverage, at a dose of 180 kg ha-1, using urea as a source. Thus, in maize cultivation the experimental design is a randomized block with sub-subdivided plot. The residual effect of increasing doses of lime applied in 2015 showed no significant response in oat dry mass production, nor in the corn yield components. The use of increasing doses of poultry litter increased black oat dry mass production linearly. Increasing poultry litter dose increased corn plant height and ear insertion height and also increased grain yield. The use of cover urea also increased plant height, ear insertion height and corn grain yield, but the largest increases in grain yield and plant height and ear insertion occurred in the absence of poultry litter ( 0 Mg ha-1) and in the lower doses of poultry litter, the higher the poultry litter dose, the smaller the increase in plant height, ear insertion and corn grain yield with the use of urea. roof.