Evaluation of Soil Survey Scale for Zone Development of Site-Specific Nitrogen Management

Abstract

outputs in time. Prescription maps of fertilizer rates are usually derived from one or more condition maps, Zone sampling for site-specific N application has been shown to modified perhaps by performance maps. The four condibe effective in North Dakota and other areas of the Great Plains. Printed and sometimes digitized soil surveys are presently available tion-map categories for nutrient management are (i) for most agricultural counties in the USA. Order 2 soil surveys gener-soil surveys, (ii) interpolation of a network of point ally have scales that range from 1:12 000 to 1:31 680. These surveys samples (i.e., grid sampling), (iii) yield monitor data or were developed for general planning purposes. There is interest in remotely sensed images, and (iv) modeling to estimate using Order 2 soil surveys as a basis for delineating N management spatial nutrient patterns. zone patterns, especially where the soil-mapping units have been Soil surveys are compendiums of soils in a region. digitized. This study was conducted to evaluate soil survey scales at Compendiums contain information on boundaries of the Order 1 (scale Ͼ1:15 840) and Order 2 level against grid-and soil series, types, associations, or complexes that are topography-based zone sampling to determine whether soil surveys usually traced on aerial photographs of the region. Most at these scales could be used to delineate N management zones for soil surveys in the USA are designated second order site-specific fertilizer application. Fields mapped at a finer scale (Order 1 survey) showed some similarity between mapping units and N man-

Responsive in-season nitrogen management for cereals

“…To accommodate spatially variable landscape conditions and better match fertilizer N supply with crop N requirements, some (Franzen et al, 2002;Ferguson et al, 2003) have advocated a soil-based approach involving delineation of spatial variability into management zones (MZ) as a means to direct variable N applications and improve NUE. Management zones, in the context of precision agriculture, are field areas possessing homogenous attributes in landscape and soil condition.…”

Challenges in Using Precision Agriculture to Optimize Symbiotic Nitrogen Fixation in Legumes: Progress, Limitations, and Future Improvements Needed in Diagnostic Testing

“…Cloud-based servers will be used for data storage. Soil sub-sampling of zones or dense grids within a field has been widely used to accurately measure different soil chemical and physical traits, and to enable site-specific nutrient management [112,113]. Similarly, various canopy parameters (e.g., plant N status) will be collected using future tractor mounted/hand-held sensors (e.g., GreenSeeker NDVI) or satellite/UAS images.…”

Geração de zonas de manejo para cafeicultura empregando-se sensor SPAD e análise foliar

“…Exemplos na literatura abrangem desde a utilização do conhecimento do agricultor (Fleming & Westfall, 2000), dados de produtividade (Diker et al, 2004;Brock et al, 2005;Flowers et al, 2005;Jaynes et al, 2005), amostragem de solo (Franzen et al, 2002;Vrindts et al, 2005), imagens (Stewart & Mcbratney, 2001;Taylor et al, 2002), sensores de indução eletromagnética e condutividade elétrica aparente (Hedley et al, 2004;Li et. al., 2008), espectrometria gama (Wong et al, 2008), até a combinação de alguns desses dados (Whelan et al, 2002;Godwin et al, 2003;Taylor et al, 2003;Fleming et al, 2004;Koch et al, 2004;Mallarino & Wittry, 2004;Schepers et al, 2005;Simbahan & Dobermann, 2006;Kyaw et al, 2008).…”