PRODUCTIVITY OF AUSTRALIAN CEDAR MINISTUMPS AND NUTRIENTS REMOVAL BY SUCCESSIVE COLLECTION OF MINICUTTINGS

Abstract

http://dx.doi.org/10.5902/1980509813324The management of ministumps to produce minicuttings results in the continuous removal of nutrients andit is necessary replacement to avoid depletion and decline in production. Thus, it is necessary to determinethe amount of nutrients removed over time, in different management models, to enable commercial mulproduction.The objective of this study was to evaluate two minigarden multiclonal systems of Toonaciliata, in plastic tubes and bed, for productivity and nutrients removal over time by ministumps, producedby seeds, submitted to successive collections of minicuttings. One hundred and eighty-six seedlings wereused in each management system. In this paper, it was determined the nutrient content in shoots issued by20 ministumps randomly selected in each system. Five shoots were collected at intervals of 32 days in bedsystem, while in the plastic tubes system three shoots were collected at intervals of 31 days. The data wereanalyzed by a sample simple random considering an infinite population of minicuttings. The qualitativetreatment average was compared by confidence interval using the Student t test, 5% probability, and thequantitative treatment (productivity and nutrients removed in time by ministumps) by regression. It hasbeen found that the productivity and nutrient contents removed by ministumps in bed were higher than inthe plastic tubes. Nitrogen and potassium are the nutrients most removed by ministumps in both systems.Here, it was presented the curves corresponding to the nutrients exported, to estimate the replacement thatwill be made in each system over time.

Keywords

• <i>Toona ciliata</i>
• minijardim multiclonal
• produção de mudas