Spatial variability of soil potassium in sugarcane areas subjected to the application of vinasse

Abstract

When deposited on land the vinasse can promote improvement in fertility, however, often fertilizer application occurs in areas considered homogeneous, without taking into account the variability of the soil. The objective of this study was to evaluate the effect of vinasse application on potassium content in two classes of soils cultivated with sugarcane, and characterize the spatial variability of soil using geostatistical techniques. In the 2010 and 2011 crop year, soil samples were collected from an experimental grid at 0-0.2 and 0.2-0.4 m depth in three soils cultivated with sugarcane, totaling 90 samplings in each grid, for the determination of pH, calcium (Ca), magnesium (Mg), potassium (K), phosphorus (P), aluminum (Al) and potential acidity (H + Al ). The data have been submitted to analysis of descriptive statistics and the K attribute was subjected to geostatistical analysis. The coefficient of variation indicated medium and high variability of K for the three soils. The results showed that the spatial dependence of K increased in depth to FRce and decreased to PHlv, indicating that the attribute could have followed the pattern of distribution of clay in depth. The investigation of the spatial variability of K on the surface and subsurface soils provided the definition of management zones with different levels of fertility, which can be organized into sub-areas for a more efficient management of the resources and the environment.

Spatial Variability of Soil Fauna Under Different Land Use and Managements

“…In a given area, geostatistical techniques can identify properties that are treated as homogeneous but would need a differentiated management (Ribeiro et al, 2016). Moreover, by these techniques, soil properties can be understood, modelled, and mapped to identify specific management zones and reduce the effects of soil variability on crop yields (Siqueira et al, 2009;Chiba et al, 2010;Montanari et al, 2010;Carvalho et al, 2014;Zonta et al, 2014;Aquino et al, 2015;Montanari et al, 2015;Siqueira et al, 2015aSiqueira et al, , 2017.…”

“…Soil variability occurs due to the interaction of formation factors, climate, temperature, and management (Bonnin et al, 2010;Siqueira et al, 2017), which directly affects agricultural productivity (Basso et al, 2011). The different planting systems can alter the soil quality, due to constant fertilization and liming, resulting in changes in the physical, chemical, and biological soil properties (Baretta et al, 2003;Carvalho et al, 2014).…”

Ethnic ancestry and smoking, farming of wine grapes in semiarid regions, and the potentials of Manihot multifida in medicine use

“…Research on how to promote fertility in soils for the purpose of increasing productivity is a must in every country these days and there are different ways to do that (e.g., Doran 2002, Carvalho et al 2014. Despite the fact that wine grapes are not traditionally farmed in the northeastern part of Brazil, in recent years such production is growing, particularly in the São Francisco Valley.…”