Abstract
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.
Highlights
Brazil is the largest global producer of sugarcane (Saccharum officinarum L.) and leader in its export
This study aimed to investigate the effect of the variation of micrometeorological elements on the survival and quality of pre-sprouted sugarcane plantlets
The plantlets were obtained by the technique of production of pre-sprouted plantlets (PSP), adapted from the methodology proposed by Landell et al (2013)
Summary
Brazil is the largest global producer of sugarcane (Saccharum officinarum L.) and leader in its export. As the export and consumption of derivatives of this species increase, there is an increment in the demand for new cultivation technologies that allow higher profitability and production quality (CONAB, 2015). One of these technologies is related to the method of propagation, in which the structure used is traditionally the same to store sugars, planting and renewal of new areas. Sugarcane vegetative performance is highly dependent on micrometeorological conditions, because variations in air temperature, soil water availability, light intensity and solar radiation quality exert great influence on the viability of seedling production (Gupta & Jatothu, 2013). The use of photo-selective shade nets alters the micrometeorological elements that influence plantlet growth and development
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