Fecha/hora: 01/06/2024 04:08:56

Biblioteca(s): | INIA Las Brujas.
Fecha corriente: | 29/01/2020
Fecha de la última actualización: | 29/01/2020
Autoria: | SAWCHIK, J.; MALLARINO, A.P.
Afiliación: | JORGE SAWCHIK PINTOS, INIA (Instituto Nacional de Investigación Agropecuaria), Uruguay; ANTONIO P. MALLARINO, Dep. of Agronomy, Iowa State Univ., Ames, IA, United States.
Título: | Evaluation of zone soil sampling approaches for phosphorus and potassium based on corn and soybean response to fertilization.
Año de publicación: | 2007
Fuente/Imprenta: | Agronomy Journal, November 2007, Volume 99, Issue 6, Pages 1564-1578. Doi: 10.2134/agronj2006.0151
ISSN: | 0002-1962
DOI: | 10.2134/agronj2006.0151
Idioma: | Inglés
Notas: | Article history: Published November, 2007.

Contenido:

ABSTRACT.
Soil sampling approaches have been compared based on soil-test variation. This study evaluated sampling approaches for P and K based on yield response to fertilization. Strip trials were established on four fields for P and three fields for K managed with corn (Zea mays L.) and soybean (Glycine max L. Merr.) rotations and evaluated 3 or 4 yr (27 site-years). Treatments replicated three to four times were fertilizer and no fertilizer application. Soil test results from a dense grid-point sampling (DG) approach (0.08 to 0.27 ha) were used to simulate six approaches: (i) 1.0-ha grid cells (GC), and zones delineated based on (ii) soil series from digitized survey maps (SMZ); (iii) elevation (EZ); (iv) apparent soil electrical conductivity, ECa (ECZ); (v) EZ and ECZ (EECZ); and (vi) EZ, ECZ, and slope (EECSZ). Grain yield monitors, global positioning systems (GPS), and geographical information systems (GIS) were used to describe crop responses. Estimates of soil-test variation were largest for DG, intermediate for GC, and less for other approaches. Crops responded (P &#8804; 0.05) to fertilization in 20 site-years. Sampling approaches DG, GC, EZ, EECZ or EECSZ, ECZ, and SMZ identified a differential within-field yield response in 16, 8, 5, 3, 2, and 2 site-years, respectively. Differential yield responses seldom were explained by zone-mean soil-test values. Zone approaches often identified areas with different yield levels but were less effective than DG or GC at describing within-field variation of soil tests and yield response to fertilization. Zone approaches may be more effective in fields with shorter fertilization histories or soils with more contrast in properties. 
© American Society of Agronomy.

Palabras-Clave: | Fertilizers.
Thesagro: | GLYCINE MAX; ZEA MAYS.
Categoría del tema: | F01 Cultivo
Registro original: | INIA Las Brujas (LB)
Ejemplares: | LB - (102129-1) - PXI - AP - DD - PP/AGRONOMY JOURNAL/2007 -  -  - DIS