RESUMOEste trabalho teve como objetivo avaliar a resistência do solo a penetração, por meio de um penetrógrafo eletrônico de velocidade constante, em dois solos: Latossolo Vermelho distrófico Típico, textura argilosa e Latossolo Vermelho Amarelo distrófico Típico, textura média, submetidos aos processos de mecanização e transporte na cultura de cana-de-açú-car, em função de diferentes números de corte e diferentes profundidades de trabalho. Os dados foram analisados estatisticamente sob dois formatos: (a) pela estatística convencional, comparando-se as médias dos tratamentos pelo teste de Tukey a 5% de probabilidade e (b) pela geoestatística, utilizando-se a semivariância para produzir modelos que representassem dependência espacial dos dados. Os resultados de resistência do solo a penetração, mostraram-se diferenciados nas profundidades estudadas, indicando que o peso dos veículos e máquinas e a pressão dos rodados provocaram alterações no perfil do solo. Palavras-chave: compactação do solo, mecanização, geoestatísticaUse of an electronic penetrometer to evaluate resistance of a soil cultivated with sugarcane 1 ABSTRACTThis work aimed to evaluate soil resistance to penetration by means of a constant-speed electronic penetrograph, in two soils: a clay-textured Rhodic Haplustox and a loamy-textured Typic Haplustox, under mechanization and transportation processes in a sugarcane crop as a function of different numbers of cuts and different working depths. The data were statistically analyzed under two formats: (a) by means of conventional statistics, in which the treatment means were compared by Tukey test at 5% probability level, and (b) by geostatistical analysis, in which semivariance was used to produce models that would represent the spatial dependence of the data. The resistance to penetration results showed distinct behaviors for the studied depths, indicating that the weight of vehicles and machinery and the rotating wheel pressure caused alterations in the soil profile.
-Due to the high sucrose content, RB002504 is indicated for harvesting in the early harvest period, from September to November, in the Northeastern region of Brazil. Planting on medium texture soils is recommended. The cultivar is highly responsive to ideal production environments and resistant to the major sugarcane diseases.
This study was conducted to identify the water-deficit tolerant sugarcane varieties (Saccharum officinarum L.) by cultivating them under mild-to-severe water deficit conditions. The experiments were performed in a greenhouse, employing the randomized block design in a 7 x 5 factorial scheme corresponding to seven sugarcane varieties (RB867515, RB92579, RB855536, RB72454, RB073036, RB073028, and RB073040) and five types of soil water stress (12, 24, 36, 48, and 60 kPa). Water stress was maintained throughout the experiment period. The experimental units included 10 dm 3 pots, with three replications, accounting for 105 pots in total. Height, diameter, and stalk dry mass were the variables analyzed and evaluations were done 90 days post transplantation. Finally, the RB073028, RB867515, and RB72454 varieties were identified as being tolerant to severe water stress. The varieties of RB073036 and RB073040 could tolerate moderate water deficit and the RB92579 and RB855536 varieties showed water deficit sensitivity.
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