Propriedades físicas do solo e produtividade de mandioca em diferentes manejos de coberturas do solo

Abstract

Plants used as green manure can be managed in different ways. Thus, this study evaluates the impact of managing Crotalaria ochroleuca and weeds on cassava yield, soil physical properties and weed management. The treatments consisted of cassava cultivation on four soil cover types: 1-mowed and incorporated C. ochroleuca; 2-mowed C. ochroleuca; 3-mowed and incorporated weed community; and 4-weeded control. The incorporation of C. ochroleuca and weeds reduced soil density and increased total soil porosity compared to mowed C. ochroleuca and weeded control. There was no difference in soil penetration resistance between the treatments with incorporation of vegetation cover. C. ochroleuca, either mowed or incorporated, did not affect weed dry matter density and dry matter accumulation in cassava at 60 days after planting. Commercial yield of cassava did not differ between treatments (averaging 30 t ha-1). The results indicate that managing C. ochroleuca or weeds influences soil physical properties, but not necessarily cassava yield.

Physical Properties of Soil and Glyphosate Residue as a Function of Cassava Weed Management by Cover Crops in the Amazon Ecosystem

“…Thus, the use of cover crops is an alternative for suppressing weeds, reducing the demand for herbicides and the risks of food contamination (Ghahremani et al, 2021;Mennan et al, 2020;Proctor, 2021). Moreover, cover crops as legumes and grasses can improve the physical properties of soil in different forms and several studies have shown these benefits (Demir and Işõk, 2020;R os and Hirata, 2019;Soares et al, 2021). Although cassava is known worldwide for its rusticity and low nutritional requirements, physical properties of soil, such as bulk density and porosity, can be crucial for this crop, since these properties are directly related with the resistance of penetration and expansion of roots in the soil.…”