ARTÍCULO
TITULO

Cattle manure and N-urea in radish crop (Raphanus sativus).

Juan W. Mendoza Cortez    
Arthur B. Cecílio Filho    
Edson L. Coutinho    
Anarlete Alves    

Resumen

This work was carried out in Jaboticabal (575 m altitude, 21°15? 22? S and 48° 15? 58? W), São Paulo, Brazil, aiming to investigate the effects of cattle manure and nitrogen (urea) doses on radish height and yield. Randomized blocks were used with a 2x4x4 factorial scheme and 3 replications. The treatments were combinations of cultivars (25 and 19), cattle manure doses (0, 25, 50, and 75 t ha-1 dry basis) and N doses (0, 60, 120 and 180 kg ha-1). Increased cattle manure and urea doses provided higher plant height and commercial yield in both cultivars, but the N produced more significant effects than the cattle manure. The maximum commercial yield of cultivar (cv) 19 (20.34 t ha-1) was obtained using 75 t ha-1 of cattle manure and 139 kg ha-1 of N, whereas that of cv 25 (11.90 t ha-1) occurred with 75 t ha-1 of cattle manure and 180 kg ha-1 of N. The maximum economic efficiency doses for cv. 25 were 65.1 t ha-1 and 180 kg ha-1 of cattle manure and N, respectively, whereas those for cv 19 were 63.6 t ha-1 and 144.7 kg ha-1 of cattle manure and N, respectively. El trabajo fue realizado en la ciudad de Jaboticabal (575 m de altitud, 21°15? 22? S y 48° 15? 58? W), São Paulo, Brazil, con el objetivo de determinar el efecto de las dosis de estiércol de ganado y de nitrógeno (urea) en la altura y en el rendimiento de rabanito. El diseño experimental utilizado fue de bloques al azar, en esquema factorial 2x4x4 con tres repeticiones. Los tratamientos resultaron de la combinación de los factores cultivares (cv. 25 e híbrido 19), dosis de estiércol (0, 25, 50 y 75 t ha-1 en base seca) y dosis de N (0, 60, 120 y 180 kg ha-1). El aumento en la dosis de estiércol y N promovieron mayor altura de plantas y rendimiento comercial de ambos cultivares, pero con una mayor contribución de N en comparación con el estiércol. La máxima productividad del híbrido 19 (20.34 t ha-1) se obtuvo con 75 t ha-1 de estiércol y 139 kg ha-1 de N, mientras que para el cv. 25 (11.9 t ha-1) con 75 t ha-1 de estiércol y 180 kg ha-1 de N. Las dosis de máxima eficiencia económica observadas en el cv. 25 fueron 65.1 t ha-1 y 180 kg ha-1 de estiércol y N, respectivamente, mientras que para el híbrido 19 fueron de 63.6 t ha-1 y 144.7 kg ha-1 de estiércol y N, respectivamente.

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