The genus Amaranthus comprises several species of the Amaranthaceae family whose leaves and seeds are regularly consumed as food by populations in several countries, among which Brazil is not yet included. The objective of this work was to evaluate the productive potential of amaranth (Amaranthus cruentus cv. BRS Alegria) as a function of different seasons and sowing densities in succession to the soybean crop in the region of Lucas do Rio Verde, MT. The experimental design was a randomized complete block design, with four replications, in a 5x4 factorial scheme. The first factor refers to the five sowing seasons (16/02/2013; 26/02/2013; 05/03/2013; 20/03/2013 and 05/04/2013) and the second factor the four sowing densities (11.4, 20.0, 28.5 and 37.1 ppt m-2). The evaluated characteristics were: plant height (AP, in meters); stem diameter (DC, in millimeters); panicle length (CP, in millimeters); dry panicle mass (MSP, in g); dry mass of stalk (MSC, in g); sheet dry mass (MSF, in g); total dry mass (MST, in g); final population of plants (POP, in plants ha-1); productivity (PROD, in kg ha-1). The experimental data were submitted to analysis of variance and when means were significant the Tukey test to was utilized to compare the means. There was significant difference (p>0.05) in sowing density between the seasons, thus validating the variation of the desired sowing density between the seasons. The obtained real population and the different seasons of sowing were adopted as sources of variation of the other evaluated attributes. The later sows determined a longer time interval between sowing and panicle emission, as well as harvesting. The cumulative precipitation until the panicle and harvesting emission showed a great reduction as a function of the planting times. It is concluded that the productivity of the Amaranth crop is influenced directly by the number of plants per square meter and by the sowing season in succession the soybean crop.
Produção de milho e braquiarão consorciado sob adubação nitrogenada e fosfatada RESUMO Objetivou-se avaliar a produção de milho e da forrageira Brachiaria brizantha em consórcio sob adubação fosfatada e nitrogenada, e a formação da pastagem após a colheita do milho. Utilizou-se o delineamento em blocos ao acaso, em esquema fatorial 3x4 com três repetições. O primeiro fator constou de níveis de P 2 O 5 aplicados na semeadura do milho (50, 100 e 150 kg ha-1) e o segundo fator de níveis da adubação nitrogenada, sendo: 15+0+0+0; 15+30+0+0; 15+90+0+0; e 15+90+40+40 kg ha-1 aplicados, respectivamente, na semeadura; na fase de 5-6 folhas abertas do milho; na colheita do milho; e no início da estação chuvosa após a colheita do milho. Os tratamentos adicionais foram as testemunhas em monocultivo de B. brizantha com e sem adubação e o milho. Verificou-se maior rendimento do milho com o aumento dos níveis das adubações. Em consórcio, o milho reduziu a produção forrageira. Considerando o resíduo das adubações foi observado maior rendimento da forrageira estabelecida pelo consórcio nas doses mais altas dos adubos; contudo, esta produção foi inferior à pastagem formada em cultivo solteiro adubado. A pastagem cultivada sem adubação produz metade do rendimento forrageiro da testemunha adubada. Palavras-chave: Competição, integração agricultura e pecuária, rendimento de grãos, rendimento forrageiro.
Antracnose causada por espécies de Colletotrichum é uma das principais doenças da soja no Brasil. O objetivo foi avaliar programas de fungicidas no controle de antracnose e produtividade na cultura da soja, em experimento realizado na safra 2018/2019 em Lucas do Rio Verde – MT; utilizando cv. Monsoy 8210 IPRO com 20% de inoculação de sementes com Colletotrichum truncatum. O delineamento experimental foi blocos ao acaso com quatro repetições e aplicação de nove programas de fungicidas aos 30, 45 e 60 dias após a semeadura (DAS). Avaliou-se Área Abaixo da Curva de Progresso da Doença (AACPD), incidência de sintomas em vagens, número de vagens/plantas, desfolha, massa de mil grãos, produtividade e sanidade de grãos. A inoculação do patógeno reduziu o estande de plantas e número de plantas com cotilédones. Os programas de fungicidas reduziram incidência e severidade de antracnose na parte aérea das plantas em R5.3 e R5.5. O programa trifloxistrobina+ciproconazol (30 DAS) e trifloxistrobina+protioconazol+mancozebe (45 e 60 DAS) apresentou menor incidência de sintomas de antracnose em vagens. Os programas de fungicidas reduziram a desfolha no estádio fenológico R6. O programa piraclostrobina+epoxiconazol (30 DAS), fluxapiroxade+piraclostrobina +oxicloreto de cobre (45 DAS) e epoxiconazol+fluxapiroxade+ piraclostrobina+ oxicloreto de cobre (60 DAS); programa com trifloxistrobina+ciproconazol (30 DAS) e trifloxistrobina+protioconazol+mancozebe (45 e 60 DAS); e programa com propiconazol+difenoconazol (30 DAS), difeconazol+ciproconazol+clorotalonil (45 DAS) e azoxistrobina+benzovindiflupir+difeconazol+ciproconazol (60 DAS), reduziram a AACPD de antracnose. Maiores valores de produtividade e peso de mil sementes foram obtidos com o programa trifloxistrobina+ciproconazol (30 DAS) e trifloxistrobina+protioconazol+mancozebe (45 e 60 DAS).
The objective of this work was to study the influence of three management systems on the physical attributes and productivity of irrigated wheat, cultivar BRS-254, in the city of Tangara da Serra, MT. The soil physical attributes were: weighted mean diameter (DMP) and geometric mean diameter (DMG). The experimental design was in randomized blocks. The treatments for weighted average Pereira et al.; JEAI, 39(3): 1-5, 2019; Article no.JEAI.49984 2 diameter (WMD) and geometric mean diameter (DMG) were arranged in a subdivided plot scheme, with eight replications. The tilting preparations obtained the highest DMPs compared to SD both in the 0-10 cm layer and in the 10-20 cm layer, a result possibly related to the incorporation of residues during the soil preparation associated with higher mucilage production promoted by higher activity of the root system of the crop, which found better soil physical conditions for its development. The PC presented a reduction in DMP when comparing the value in the 0-10 cm layer with the value in the 10-20 cm layer. The significant effect of soil preparation on DMG can also be a result of the incorporation of residues during the preparation, associated to the effect of higher root volume promoted by the higher root growth of the crop in these preparations, which, in turn, guarantee greater production of mucilages promoting greater soil aggregation and higher DMG. The use of the disk grid in the PC and PM interferes with the soil attributes. Soil inversion provided higher WMD and DMG. Original Research Article
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