De Carvalho Laércio A, Meurer Ismael, Da Silva Junior Carlos A, Santos Cristiane F B, Libardi Paulo L
Universidade Estadual de Mato Grosso do Sul/UEMS, Unidade de Dourados, Cidade Universitária de Dourados, Dourados, MS, Brasil.
Escola Superior de Agricultura "Luiz de Queiroz", Universidade de São Paulo, Piracicaba, SP, Brasil.
An Acad Bras Cienc. 2014 Dec;86(4):1999-2012. doi: 10.1590/0001-3765201420130319.
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.
酒糟施用于土地时可提高土壤肥力，然而，施肥往往在被认为性质均一的区域进行，而未考虑土壤的变异性。本研究的目的是评估酒糟施用对两类种植甘蔗土壤中钾含量的影响，并用地统计学技术表征土壤的空间变异性。在2010年和2011年作物年度，从种植甘蔗的三种土壤中，在0 - 0.2米和0.2 - 0.4米深度的实验网格采集土壤样本，每个网格共采集90个样本，用于测定pH值、钙（Ca）、镁（Mg）、钾（K）、磷（P）、铝（Al）和潜在酸度（H + Al）。数据进行了描述性统计分析，钾属性进行了地统计学分析。变异系数表明三种土壤中钾的变异性为中等和高度。结果表明，钾的空间依赖性在深度上对FRce增加而对PHlv降低，表明该属性可能遵循了粘土在深度上的分布模式。对表层和亚表层土壤中钾的空间变异性的研究为具有不同肥力水平的管理区提供了定义，这些管理区可划分为子区域，以便更有效地管理资源和环境。
