PRODUCTION OF LETTUCE UNDER GREEN MANURING WITH Calotropis procera IN TWO CULTIVATION SEASONS

Authors

  • Ênio Gomes Flôr Souza Instituto Federal de Alagoas, Piranhas, AL
  • Edson Ferreira de Lima Instituto Federal de Alagoas, Santana do Ipanema, AL
  • Aurélio Paes Barros Júnior Department of Crop Science, Universidade Federal Rural do Semi-Árido, Mossoró, RN
  • Lindomar Maria da Silveira Department of Crop Science, Universidade Federal Rural do Semi-Árido, Mossoró, RN
  • Francisco Bezerra Neto Department of Crop Science, Universidade Federal Rural do Semi-Árido, Mossoró, RN
  • Ellen Abreu da Cruz Instituto Federal de Alagoas, Piranhas, AL

DOI:

https://doi.org/10.1590/1983-21252017v30n214rc

Keywords:

Lactuca sativa L.. Roostertree. Organic cropping.

Abstract

The production of vegetable crops is characterized by intensive land use, high input demands and the requirement of strategic management adoption with an agro-ecological approach. In this study, agronomic indicators were evaluated in lettuce fertilized with different amounts of roostertree biomass; fertilizer was incorporated into the soil at distinct times and seedlings were planted in two cropping seasons (spring and autumn-winter) in Serra Talhada, Pernambuco state, Brazil. The experimental design consisted of randomized complete blocks with three replications and treatments arranged in a 4 x 4 factorial scheme. The first factor was the amounts of roostertree biomass (5.4, 8.8, 12.2, and 15.6 t ha-1 on a dry basis) and the second the manure incorporation times (0, 10, 20, and 30 days before lettuce transplanting). The variables evaluated in the lettuce crop were: plant height and diameter, number of leaves per plant, productivity of green mass, and dry shoot mass. Maximum productivity and dry shoot mass were obtained using fertilization with 15.6 t ha-1. A synchrony between supply of nutrients by green manure and the period of maximum demand by lettuce was observed in the incorporation times of 10 (spring) and 20 (autumn-winter) days before transplanting. Cultivation in the spring resulted in higher vegetative growth.

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Published

24-01-2017

Issue

Section

Agronomy