Efectos de la ubicación de un fertilizante nitrógeno-fosfatado sobre la nodulación y la producción de soja en siembra directa en la región de la pampa arenosa, Argenmtina

DÍAZ-ZORITA, MARTÍN; GROSSO, GABRIEL A; FERNÁNDEZ CANIGIA, MARÍA VIRGINIA; DUARTE, GUSTAVO A

Ciencia Del Suelo

AACS

Lugar: Buenos Aires; Año: 1999 vol. 17 p. 62 - 65

0326-3169

No-till (NT) soybean production is an important practice in the sandy Pampas region (Argentina). Soybean crops have high nutritional requirements but few research has been conducted on soybean N-P fertilization for NT systems. Our objective was to evaluate the effects on soybean nodulation and yields, of N-P fertilizer pre-plant placements in a non-P deficient sandy Typic Haplustoll. The soybean crop followed corn in a continuous NT system since 1993. Five fertilization treatments with diammonic phosphate (FDA) were applied before seeding: 0, 50 and 100 kg ha-1 of FDA broadcasted and banded (0.05 m below the seeding line). The aerial dry matter, total P and N in top trifoliate leaves and nodulation were evaluated in the full-bloom stage. Grain yields were determined at physiological maturity. Fertilizer placement x FDA rate interaction was not significant for any measured parameter. The nodules’ number and weight increased when the FDA rate increased. No differences in nodulation were observed between the fertilizers placement treatments. In this conditions there are not differences in soybean production between banded or broadcast fertilizer placement