Taxas de decomposição e de liberação de macronutrientes da palhada de aveia preta em plantio direto

By C. Crusciol, Edemar Moro, E. Lima, M. Andreotti. 2008

68 citations recorded by the source corpus.

ABSTRACT DECOMPOSITION RATE AND NUTRIENT RELEASE OF OAT STRAW USED AS MULCHINGIN NO-TILL SYSTEM Plant residues left on soil surface in no-tillage systems are an important source of nutrients forthe following crops, particularly under tropical climate, in which high residue decomposition rates shortentheir persistence. The objective of this research work was to evaluate black oat decomposition and releaseof nutrients. The experiment was carried out during the 1998 cropping season in an experimental arealocated in Marechal Cândido Rondon, Parana State, Brazil. A randomized block design with fourreplications was used. The cover crop was rolled over thirty days after emergence. Persistence and releaseof nutrients were evaluated at 0, 13, 35 and, 53 days after rolling and desiccation. Decompositon rate ofoat residue was constant during this period (remaining 34% of the initial amount) and inverselyproportional to the C/N ration that showed an initial value of 34 and a final value of 50. Most K wasreleased soon after oat management, remaining only 2% of the initial content in the last sampling time.N, P, Ca and S were gradually released, and in the last evaluation the remaining amount of these nutrientswas 55%, 42%, 48%, and 47% of the total accumulated amount, respectively. Compared to other plantnutrients, K followed by N were the nutrients available in higher amount in the soil, reaching maximumrelease speed between 10 and 20 days after rolling and dessication of black oat.

Subfields: Plant Science, Soil Science

View Paper: https://www.semanticscholar.org/paper/e55ea90f5c81efa413aa8cea44176de44cefa513