Fecha/hora: 11/06/2024 07:23:55

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