<b>Photosynthetic measurements in lettuce submitted to different agroindustrial residue composting</b>

Authors

  • Claudiana Moura dos Santos UNESP/FCA
  • Laurício Endres
  • Tâmara Claudia de Araújo Gomes unesp
  • Cleber Júnior Jadoski Unesp
  • Luis Antonio do Nascimento
  • Emanuelle Dias dos Santos unesp

DOI:

https://doi.org/10.5777/paet.v3i3.1269

Keywords:

Gas exchange, chlorophyll fluorescence, organic composts

Abstract

This work was developed with the objective of evaluate effects of different organic composts on the photosynthesis, gas exchange, chlorophyll fluorescence in lettuce grown under nursery conditions. The experiment was accomplished following a randomized design, with 14 treatments and four replications. Using the following treatments: T1 to T6 (sugarcane based substrates), T7 to T12 (coconut based substrates), T13 (manure) and T14 (mineral fertilization). The following parameters were evaluated: photosynthesis rate, respiration, stomata conductance, the ratio of internal to external CO2 concentrations (Ci /Ca), the efficiency of water use (A/E) and carboxylation efficiency (A/Ci), chlorophyll concentrations, maximum quantum yield of photosystem II (Fv/Fm). The plants of lettuce grewn with mineral fertilization and manure showed higher values of stomatal conductance. The treatments with sugarcane based substrates showed higher rates of photosynthesis, transpiration, carboxylation efficiency and chlorophyll content, indicating that the better photosynthetic capacity when grown on these substrates.

Author Biographies

Claudiana Moura dos Santos, UNESP/FCA

Bióloga, formada pela Universidade Federal de Alagoas (UFAL), Mestre em Agronomia (UFAL), Doutoranda em Agricultura pela Faculdade de Ciências Agronômicas FCA/UNESP- Botucau-SP.

Laurício Endres

UFAL

Cleber Júnior Jadoski, Unesp

Doutorando Ecofisiologia Vegetal

Published

21-09-2011

Issue

Section

Articles