Soil resistance to penetration in cotton rows and interrows

Abstract

A B S T R A C TThe soil physical quality is one of the most determinant factors for the development of any crop. This study aimed to assess the sample representativeness in soil resistance to penetration mappings taken in rows and interrows of the cotton crop, under two soil moisture conditions. Thirty control points were sampled in a cotton field of 91 ha. Soil resistance to penetration and soil moisture were measured at these georeferenced points. Regardless of soil moisture, the sampling position of soil resistance to penetration is indifferent (row, interrow, or in both positions) when the analysed depth is greater than 0.20 m in the cotton crop. The decrease of soil moisture causes the increment of soil resistance to penetration, regardless of the sampling position.Resistência mecânica do solo à penetração nas linhas e entrelinhas no cultivo do algodoeiro R E S U M OA qualidade física do solo é um dos fatores mais determinantes no desenvolvimento de qualquer cultura. Este trabalho teve, como objetivo, avaliar a representatividade amostral nos mapeamentos da resistência mecânica do solo à penetração nas linhas e entrelinhas no cultivo do algodoeiro, sob duas condições de umidade. Foram amostrados 30 pontos de controle em um talhão de 91 ha cultivado com algodoeiro. Foram realizadas leituras da resistência mecânica do solo à penetração (RP) e de umidade nesses pontos georreferenciados. Independentemente da umidade do solo é indiferente o posicionamento amostral da resistência mecânica do solo à penetração (linha, entrelinha ou em ambas as posições) quando a camada analisada é maior que 0,20 m no cultivo do algodoeiro. A diminuição da umidade do solo ocasiona o aumento dos valores da resistência mecânica do solo à penetração, independentemente do posicionamento amostral.

Guar root and shoot growth as affected by soil compaction

“…The soil penetration resistances in the compacted layer were 0.20 MPa, 0.33 MPa, 0.50 MPa, 0.93 MPa and 1.77 MPa, respectively for the densities of 1.2 mg m -3 , 1.3 mg m -3 , 1.4 mg m -3 , 1.5 mg m -3 and 1.6 mg m -3 (Figure 1), at a depth of 0.15-0.20 m. This finding was in agreement with the literature, as values higher than 2 MPa generally prevent the development of most crops (Baio et al 2017). The values in the present study were close to those reported by Foloni et al (2006) The root and shoot dry matter yield increased by 47 % and 50 %, respectively, when the penetration resistance was increased to 0.95 MPa and 0.87 MPa, respectively.…”

Time Available for Spraying and Mechanized Sowing in the Northeast of the State of Mato Grosso Do Sul and South of Goiás

“…The rainy months are the most limiting, due to the time of evaporation so that the soil reaches the adequate humidity, in order to reduce the problem of its compaction by the route of the sprayer, as Baio et al (2017) affirm. Although the Latosols present excellent physical properties, their inadequate management, through the revolving and the traffic of agricultural machines of concentrated form, has favored their compaction (Valicheski et al, 2012;Ataíde et al, 2012).…”

“…Therefore, it is understood that the farmer carries out the spraying under conditions of high soil moisture, leading to higher compaction in the path of the sprayer. The increase in soil density and compaction is mainly related to the traffic of machines (Baio et al, 2017).…”