Nutrient uptake and biomass production of black oats in soils under eighteen years of organic and mineral fertilizer

Abstract

This work aimed to quantify the content and accumulation of macronutrients (N, P and K) in the dry biomass of oats-black (Avena strigosa Schreb) and in soil (P and K), recycled by the oats-black after the waste left in the soil by successive fertilizations organic and mineral carried out in maize. The experiment was conducted at the Experimental Field of Coimbra, located in the city of Coimbra / MG from the Department of Plant Science (DFT) of the Federal University of Viçosa (UFV). The planting of oats-black was conducted in the agricultural year 2003/2004. The treatments were: no fertilization, mineral fertilization at 150 kg ha^-1 of 8-28-16 formulation with the addition of 50 kg ha^-1 N topdressing (AM1); mineral fertilization at 300 kg ha^-1 of 8-28-16 formulation with the addition of 100 kg ha^-1 N topdressing (AM2) and organic manure (AO) with 40 m³ ha^-1 of compost. These treatments were applied sequentially in corn cultivation for a period of eighteen. The treatments were arranged in a randomized block design with four replications. Was determined the accumulation of dry mass of aerial part, content and accumulation of N, P and K in shoots of oats-black, P and K content in soil, base saturation and CTC. The treatment with organic fertilization provided higher accumulation of dry matter of aerial part of oats-black and nutrient uptake. The nutrients determined in the soil were directly proportional to the accumulation of dry mass and specific nutrients in shoots of oats-black.