The aim of this study was to evaluate some physiological aspects of papaya crops in semi conventional and organic production systems.The following factors assessed in this experiment were:1.Production systems(organic ...The aim of this study was to evaluate some physiological aspects of papaya crops in semi conventional and organic production systems.The following factors assessed in this experiment were:1.Production systems(organic and semi conventional);2.Genotypes(Maradol and Maradona F1),and 3.Cover crop plants(Canavalia,vegetative cover and no cover).Twelve treatments were obtained-product of factors’combination-and distributed under a threerepetition experimental design of subdivided parcels.The factors examined in this study,that changed the CO_(2) assimilation rate,were production system and genotype.It was determined that the greatest gas exchange in papaya crops happened at 13:40 h but achieving the highest CO_(2) assimilation was also affected by the production system and genotype.Similarly,they showed some effects in CO_(2) assimilation,transpiration,stomatal conductance,intercellular CO_(2),leaf temperature,chlorophyll,and temperature.In general,the combination of factors that accentuated in this experiment were the semi conventional-Maradona-Canavalia with a crop yield of 53.5 t ha^(-1),followed by treatments organic-Maradona-no cover and semi conventional-Maradona-vegetative cover.展开更多
In two tomato genotypes,we assessed control alternatives for damping-off with combinations of chemical fungicides and native/commercial strains of biological agents.Forty treatments consisting of 19 levels of mixing p...In two tomato genotypes,we assessed control alternatives for damping-off with combinations of chemical fungicides and native/commercial strains of biological agents.Forty treatments consisting of 19 levels of mixing products,chemical fungicides,native strains and commercial products from biological control agents,and untreated treatment were used onto Ramsés and Toro hybrids.They were distributed on an incomplete block design in divided plots arrangement,where genotypes constitute the larger ones and the 8-repetition mixed products,the smaller ones.Putting 180 mL of fungal complexes,made of spores and mycellium Fusarium-solani(2×106 UFC),Rhizoctonia-solani(1×106 UFC),Phytophthora-capsici(1×105 UFC)and Sclerotium-rolfsii(mycellium-sclerotia)on each seedling trays,made inoculation possible.The mixtures of(Bacillus spp.+Streptomyces spp.+Trichoderma spp.)+(Propamocarb+Fosetyl);(Bacillus spp.+Streptomyces spp.+Trichoderma spp.)+(Metalaxyl+Chlorothalonil);Pseudomonas fluorescens+Streptomyces+Micromonospore+Sporideamium+Aminoacidos,Péptidos,Carbohidratos)+(Propamocarb+Fosetyl);the native strain of Trichoderma asperellum+(Propamocarb+fosetil)and the native strains Trichoderma asperellum+Bacillus subtilis,diminished damping-off,prevented its appearance and had most significant agronomic characteristics.In contrast to this,combination of(Mancozeb)+(Free iodine)+(Metalaxyl+Chlorothalonil)+(Methyl thiophanate)produced some toxicity in the plant.In addition,Ramsés presented the best agronomic parameters,while Toro had the utmost fresh and dry weight in root.展开更多
文摘The aim of this study was to evaluate some physiological aspects of papaya crops in semi conventional and organic production systems.The following factors assessed in this experiment were:1.Production systems(organic and semi conventional);2.Genotypes(Maradol and Maradona F1),and 3.Cover crop plants(Canavalia,vegetative cover and no cover).Twelve treatments were obtained-product of factors’combination-and distributed under a threerepetition experimental design of subdivided parcels.The factors examined in this study,that changed the CO_(2) assimilation rate,were production system and genotype.It was determined that the greatest gas exchange in papaya crops happened at 13:40 h but achieving the highest CO_(2) assimilation was also affected by the production system and genotype.Similarly,they showed some effects in CO_(2) assimilation,transpiration,stomatal conductance,intercellular CO_(2),leaf temperature,chlorophyll,and temperature.In general,the combination of factors that accentuated in this experiment were the semi conventional-Maradona-Canavalia with a crop yield of 53.5 t ha^(-1),followed by treatments organic-Maradona-no cover and semi conventional-Maradona-vegetative cover.
文摘In two tomato genotypes,we assessed control alternatives for damping-off with combinations of chemical fungicides and native/commercial strains of biological agents.Forty treatments consisting of 19 levels of mixing products,chemical fungicides,native strains and commercial products from biological control agents,and untreated treatment were used onto Ramsés and Toro hybrids.They were distributed on an incomplete block design in divided plots arrangement,where genotypes constitute the larger ones and the 8-repetition mixed products,the smaller ones.Putting 180 mL of fungal complexes,made of spores and mycellium Fusarium-solani(2×106 UFC),Rhizoctonia-solani(1×106 UFC),Phytophthora-capsici(1×105 UFC)and Sclerotium-rolfsii(mycellium-sclerotia)on each seedling trays,made inoculation possible.The mixtures of(Bacillus spp.+Streptomyces spp.+Trichoderma spp.)+(Propamocarb+Fosetyl);(Bacillus spp.+Streptomyces spp.+Trichoderma spp.)+(Metalaxyl+Chlorothalonil);Pseudomonas fluorescens+Streptomyces+Micromonospore+Sporideamium+Aminoacidos,Péptidos,Carbohidratos)+(Propamocarb+Fosetyl);the native strain of Trichoderma asperellum+(Propamocarb+fosetil)and the native strains Trichoderma asperellum+Bacillus subtilis,diminished damping-off,prevented its appearance and had most significant agronomic characteristics.In contrast to this,combination of(Mancozeb)+(Free iodine)+(Metalaxyl+Chlorothalonil)+(Methyl thiophanate)produced some toxicity in the plant.In addition,Ramsés presented the best agronomic parameters,while Toro had the utmost fresh and dry weight in root.
