Abstract
The aim of this study was to assess the decomposition rate of crambe straw under different soil management practices based on no-tillage system. The experiment was carried out at the experimental area of the Agronomic Institute of Parana - IAPAR, regional center of Santa Tereza do Oeste, Parana, Brazil. Treatments consisted of four soil management practices: Traditional No-tillage System - TNTS – Chisel Plowing Tillage System - CPTS – No-tillage System with Application of Gypsum - NTSG - and Quality No-tillage System - QNTS. The treatments were distributed in randomized order in parts subdivided on time with fifteen macro-plots of 20 m x 25 m. The assessments took place on 0 (zero), 7, 15, 30, 60, 90, and 120 days after crambe crop harvest. Decomposition was determined quantitatively through the analysis of the decomposition rate of crop residues using litter bags. Average loss of crambe phytomass was significantly different (p>0.05), mainly for CPTS and NTSG, around 0. 63% day-1 and 0. 71% day-1, respectively. The longest half-life period (66 days) was observed on QNTS with bristle oat and white lupin consortium, and the shortest half-life period (45 days) was observed on CPTS. Key words: Crambe abyssinica, litter bags, half-life period.
Highlights
The alterations on physical, chemical and biological properties of a soil that is intensively used for agricultural purposes can, and normally will, result in negative impacts on the natural balance of its ecosystem
Decomposition rates of crambe crop residue varied according to treatment used
The highest decomposition rate is observed in treatment CPTS, with 0.71% day-1
Summary
The alterations on physical, chemical and biological properties of a soil that is intensively used for agricultural purposes can, and normally will, result in negative impacts on the natural balance of its ecosystem. In addition to the chosen method of soil management, the type of crop residue has great influence on the rate of decomposition of organic matter. The crambe culture can still be an option for the "safrinha" after the summer crop harvest, to be more suited to the autumn and winter seasons. It is a precocious culture, with full cycle varying from 80 to 100 days, it depends on variety, sowing time and climate conditions (Onorevoli, 2012). Analysis based on methodology proposed by Pava et al (1992).
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