Produtividade e incidência de plantas espontâneas sob diferentes coberturas de solo no cultivo de alface crespa cv. Vera

Abstract

The present work has the objective of evaluating the effect of different soil cover on the agronomic characteristics of lettuce cultivar Vera, by means of an experiment carried out at the Federal University of Fronteira sul, Campus of Laranjeiras do Sul - PR. The experimental design was a randomized complete block design with five treatments, consisting of four different soil coverages: black oats (Avena strigosa L.), vetch (Vicia sativa L.), manihot rape and leaves (Manihot esculenta Crantz ), Brachiaria (Urochloa brizantha Hochst, Ex A.Rich) with five replications, totaling 25 experimental plots. Harvesting was carried out 45 days after transplanting, and stem diameter, head diameter, fresh leaf mass, leaf dry mass, productivity per hectare and infestation of spontaneous plants were evaluated. The data collected were analyzed using the statistical analysis program Sisvar. The highest yields were observed in the treatments with the cover of vetch and cassava leaves and branches, due to the higher Carbon / Nitrogen ratio. In the evaluation of the occurrence of spontaneous plants the coverings with vetch, cassava leaves and branches presented greater suppression.