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Evaluation of photosynthetic photon flux in lettuce cultivation at different shading levels Horticultura Brasileira
Cometti,Nilton Nélio; Silva,Josimar V da; Zonta,Everaldo; Cessa,Raphael MA.
ABSTRACT Protected cultivation has grown in Brazil. Generally, greenhouses are covered with transparent plastic film and shading screen. The plastic, over time, loses its transparency due to pollution residues, dust and other debris. The loss of transparency reduces lightness, photosynthesis and leads to losses of productivity and product quality. The losses are not always detectable by the farmer. Additionally, internal shading screens are used to reduce heating transmission to the ground. The objective of this study was to evaluate the impact of shading on lettuce crop productivity and to determine the optimum shading to reach the highest productivity. Plots were set up inside and outside the greenhouse, with four shading levels with black screens (0,...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Lactuca sativa; Plastic film; Crop protection; Light.
Ano: 2020 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-05362020000100065
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Aerobic deterioration influences the fermentative, microbiological and nutritional quality of maize and sorghum silages on farm in high quality milk and cheese production chains R. Bras. Zootec.
Borreani,Giorgio; Bernardes,Thiago Fernandes; Tabacco,Ernesto.
Maize and sorghum silages are good sources of energy for lactating dairy cows that produce milk destined for fresh and matured cheeses. Silages are usually stored in horizontal silos with or without side walls on commercial farms throughout the world. The main microbiological and nutritional quality problems are related to harvesting time, ensiling technology, and management practices during filling and feed-out. Aerobic deterioration is a key point that must avoided on farms in order to improve the hygienic, chemical and sensorial quality of milk and cheeses. Aerobic deterioration causes large losses of dry matter (DM) and quality, and it can cause health problems for animals and humans through the transfer of pathogens and mycotoxins from feed and...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Aerobic deterioration; Management practices; Silostop; Plastic film; Spoilage microorganisms; Maize silage.
Ano: 2008 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982008001300009
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