Photo-selective shade nets on the production and quality of sugarcane plantlets

Abstract

Brazil is the world’s largest producer of sugarcane (Saccharum officinarum L.) and research aimed at propagation has promoted higher quality in production. The objective of this study was to investigate the effect of the variation of micrometeorological elements on the survival and quality of pre-sprouted sugarcane plantlets. The study was carried out in a protected environment (UFRPE). Plantlets of the cultivar RB92579 were obtained by the technique of production of pre-sprouted plantlets. The protected environments were divided into four modules covered with low-density polyethylene plastic + photo-selective shade nets and one module without shade net. Micrometeorological data of global and photosynthetically active solar radiation, air temperature, substrate temperature, relative humidity and the solar radiation spectrum were recorded in each module. The experiment was conducted in a completely randomized design and the principal component analysis was used to verify the association between the cultivation modules, micrometeorological variables and crop variables. Anti-UV low-density polyethylene plastic + freshnet led to lower transmittance of global solar radiation, higher percentage of photosynthetically active radiation and lower plantlet mortality. Substrate temperature above 30.2 °C resulted in higher plantlet mortality. Larger spectrum in the red range led to the production of better quality plantlet. The use of freshnet shade net promoted adequate conditions for the cultivation of sugarcane plantlets and allows obtaining better quality plantlets.

Innovative substrates for sugarcane seedling production: Sewage sludges and rice husk ash in a waste-to-product strategy

“…The best mean DQI values were found in the SS-3 formulations, similar to those observed by Cordeiro et al (2019). This index measures seedling quality and the equilibrium between their biomass components, with higher index values indicating better seedling quality.…”

Biophotonics: Acclimation of Pre-Sprouted Sugarcane Seedlings in Protected Environment

“…Ferrari & Leal (2015) obtained an average global solar radiation of 9.2 MJ m -2 day -1 , during cultivation in protected environment covered with low-density polyethylene (LDPE) associated with a thermo-reflective net, in the municipality of Rio das Pedras-SP. Cordeiro Júnior et al (2019), evaluating different photo-selective nets in the acclimation of sugarcane seedlings in a protected environment, covered with anti-UV LDPE, in the municipality of Recife, found global solar radiation of 10.68 MJ m -2 day -1 . By comparing the mean values of Rg for the lighting systems, it is possible to note differences in relation to the control of 0.62 (R:B 70/30), 0.38 (R:B 90/10) and 0.60 (R:B 80/20).…”

Particle films improve photosynthesis of citrus trees under excess irradiance by reducing leaf temperature

“…Special structures, 5.0 m × 6.0 m, were built for the covered treatments to avoid shadows overlapping and allow open‐air circulation (Figure 1). Air temperature ( T air , 29°C ± 0.05), relative humidity (RH, 59.4% ± 0.09), and photosynthetically active radiation (PAR, 1053.9 μmol m −2 s −1 ± 9.3) were monitored at 1.0 m above the ground, corresponding to the mid‐tree dossel, using automatic sensors (S‐LIA‐M003, HOBO Data login Solution ) (Cordeiro‐Júnior et al, 2021). Recorded T air and RH did not differ among open and covered treatments during the day and during the experimental period.…”