Lettuce behavior in transplant after native maize, subtropical legumes and sorghum as predecessors of horticultural crops of autumn and winter

Abstract

In 2011, an assay was implemented with the objective of evaluating cultivars of maize, subtropical
legumes and sorghum, alone or in consortium, as ancestors of lettuce cv Elisa. The treatments
were: five varieties of monoculture maize, one forage sorghum, two legumes, one bare
fallow, two consociated maize and a natural field. The weight per plant and yield of lettuce were
measured. In addition, chemical variables were measured: analysis of electrical conductivity,
total organic carbon, total nitrogen, extractable phosphorus, calcium, magnesium, potassium,
sodium and cation exchange capacity; And 10 enzymatic activities of the soils were determined.
Yields of lettuce after maize were higher than that of sorghum and legumes. The chemical
variables did not present significant differences between treatments. The enzymatic activities
in a multivarial analysis allowed to separate at least 3 groups of ancestors. The first group was
of greater enzymatic activity and corresponded to the maize varieties MZMATOGROSSO,
MZCHALAROJA, to the consortium MZBDcanav and Sorgo, being the first 3 that better yield
of lettuce produced like predecessors