SUMMARYThe planting of diversified crops during the sugarcane fallow period can improve the chemical and physical properties and increase the production potential of the soil for the next sugarcane cycle. The primary purpose of this study was to assess the influence of various soil uses during the sugarcane fallow period on soil chemical and physical properties and productivity after the first sugarcane harvest. The experiment was conducted in two areas located in Jaboticabal, São Paulo State, Brazil (21 o 14' 05'' S, 48 o 17' 09'' W) with two different soil types, namely: an eutroferric Red Latosol (RLe) with high-clay texture (clay content = 680 g kg -1 ) and an acric Red Latosol (RLa) with clayey texture (clay content = 440 g kg -1 ). A randomized block design with five replications and four treatments (crop sequences) was used. The crop sequences during the sugarcane fallow period were soybean/millet/soybean, soybean/sunn hemp/soybean, soybean/fallow/ soybean, and soybean. Soil use was found not to affect chemical properties and sugarcane productivity of RLe or RLa. The soybean/millet/soybean sequence improved aggregation in the acric Latosol.Index terms: crop diversification, soybean, millet, sunn hemp.RESUMO: USOS DO SOLO NO PERÍODO DA REFORMA DO CANAVIAL:ATRIBUTOS QUÍMICOS E FÍSICOS DO SOLO E PRODUTIVIDADE DA CANA-DE-AÇÚCAR A diversificação de culturas, no período de reforma do canavial, pode contribuir para a melhoria dos atributos químicos e físicos do solo, incrementando seu potencial produtivo para o próximo ciclo da cana-de-açúcar. O objetivo deste trabalho foi avaliar a influência de diferentes
Soil quality indicators such as penetration resistance (Pr) and bulk density (Bd) are traditionally determined in a single undisturbed soil sample. the aim of this study was to assess the effect of Pr measurements of undisturbed samples on the determination of Bd in the same sample of two soils differing in clay contents. to this end, samples were collected from the 0.00-0.10 and 0.10-0.20 m layers of two soils of clayey and very clayey texture. Volumetric rings were used to collect a total of 120 undisturbed soil samples from each soil layer that were divided into two subsets containing 60 units each. one sample set, designated "perforated samples", was used to determine Pr and Bd in the same undisturbed sample; the other, named "intact samples", was used to determine Bd only. Bulk density values for perforated and intact samples were compared by analysis of variance, using a completely randomized experimental design. means were compared by the t-test at 5 %. the Bd values for the clayey soil were similar in perforated and intact samples from the two layers. However, Bd of the very clayey soil was lower in the perforated than in the intact samples at both depths. therefore, Pr and Bd in clayey soils can be accurately determined in the same undisturbed sample whereas in very clayey soils, different samples are required for this purpose.
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