Crescimento inicial e qualidade de mudas de ipê-roxo (Handroanthus impetiginosus (Mart. ex DC) Mattos) produzidas em diferentes substratos.

Abstract

This study aimed to evaluate the behavior of Handroanthus impetiginosus saplings in relation of substrate. The experiment was conducted in a greenhouse environment (50% light interception). The treatments consisted of 7 substrates combinations: (1) 70% soil + 30% cattle manure; (2) 70% soil + 30% coconut powder; (3) 100% commercial substrate (Plantmax®); (4) 70% soil + 15% coconut powder + 15% of cattle manure; (5) 70% soil + 30% carbonized rice husk; (6) 70% soil + 15% carbonized rice husk + 15% of cattle manure; (7) 70% soil + 10% carbonized rice husk + 10% coconut powder + 10% cattle manure. At 210 days after emergence were evaluated plant height; stem diameter; height/diameter ratio; Dickson Quality Index (DQI); leaf area; leaves, stem, root, and total dry weight; specific leaf area (SLA); leaf area ratio (LAR); leaf weight ratio (RPF) and net assimilation rate (NAR). The substrates soil+carbonized rice husk and soil:carbonized rice rusk+coconut powder+cattle manure provide saplings of quality, indicating its potential for the production of H. impetiginosus saplings. The use of coconut powder in addiction of soil doesn´t provide the production of H. impetiginosus saplings.The commercial substrate Plantmax® provided H. impetiginosus higher, stronger and better quality saplings.