Artículos de revistas
Plant Growth Response Of Subirrigated Salvia 'vista Red' To Increasing Water Levels At Two Substrates
Registro en:
Horticultura Brasileira. Assoc Brasileira Horticultura, v. 34, p. 202 - 209, 2016.
0102-0536
1806-9991
WOS:000384803100009
10.1590/S0102-053620160000200009
Autor
Ferrarezi
Rhuanito S.; van Iersel
Marc W.; Testezlaf
Roberto
Institución
Resumen
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) Subirrigation applies water and nutrients to the bottom of pots without wetting leaves, improving water use and reducing disease spread compared to overhead irrigation systems. However, water levels applied within the benches are often higher than required to promote capillary action, applying more water than needed and wasting pumping energy. The present study was conducted to evaluate the effect of different water levels on plant growth of subirrigated salvia (Salvia splendens) 'Vista Red'in two substrates. Five water levels (0.75, 1.5, 3.0, 4.5, and 6.0 cm) and two substrates {pine bark: sphagnum peat moss and peat: perlite (both 75%: 25% v/v)} were tested, with four replications. Substrate moisture was monitored by capacitance-type sensors connected to a multiplexer and data logger. Volumetric water content (VWC) was higher in peat: perlite (0.34 to 0.75 m(3)/m(3)) than pine bark: sphagnum peat moss (0.21 to 0.60 m(3)/m(3)) at all water levels. Higher water levels increased VWC in both substrates. The leaf chlorophyll index was 4% lower at the 6.0 cm compared to the other treatments in peat: perlite (p< 0.0001). Stomatal conductance decreased overtime; but increased with the increase in water levels in peat: perlite (p< 0.0001). Different water levels had no effect on leaf area, net photosynthesis, number of branches and leaves, and shoot dry weight (p> 0.05), an indication that the different water levels do not affect the plant growth. However, shoot plant height increased 13% in pine bark: sphagnum peat moss (p= 0.0096) and 17% in peat: perlite (p= 0.0335) as water levels increased. Water levels of 1.5 cm and higher can be recommended for pine bark: sphagnum peat moss or peat: perlite in subirrigation, applying water according to plant needs, optimizing plant growth and reducing the nutrient solution pumping costs compared to systems that apply higher water levels. 34 2 202 209 Capes Foundation (Ministry of Education, Brazil) [BEX 1390/10-4] American Floral Endowment USDA-NIFA-SCRI award [2009-51181-05768] Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)