Diferentes doses de cama de frango como fertilizante orgânico na produção de milho

Abstract

The use of poultry litter by itself or in association with mineral fertilizers can significantly increase corn crop productivity. The objective of this work was to evaluate different doses of poultry litter in corn production in relation to the use of mineral fertilization and normal planting conditions, replacing mineral fertilization by organic fertilization (chicken litter) before sowing. The experiment was carried out in the town of Severiano de Almeida - RS, during the agricultural year 2016/2017. The experimental design was a randomized complete block design, divided in 4 blocks, each block with 7 treatments and 4 replications, in a total of 28 experimental units with an area of 2.40m x 4m, totaling 9.6m² per experimental unit. The treatments were as follows: T1 negative control, without NPK fertilizer and without nitrogen topdressing, T2 positive control, using NPK fertilizer and nitrogen topdressing, T3 with 25% of the recommended dose of poultry litter, T4 with 50% of the recommended dose of poultry litter, T5 with 100% of the recommended dose of poultry litter, T6 with 150% of the recommended dose of poultry litter and T7 with 200% of the recommended dose of poultry litter. The evaluated variables were: concentration of nitrogen and phosphorus in plant tissues and yield of grains. The application of poultry litter increased the N and P leaf contents linearly at increased doses, also significantly affected grain yield, which increased in response to the applied doses, providing yield increases up to the dose of 24t/ha.