%0 Journal Article
%T Efectos de diferentes pr芍cticas de manejo en la nodulaci車n y en el rendimiento del cultivo de soja Effects of different management practices on nodulation and on the yield of soybean crops
%A L. Pietrarelli
%A J.L. Zamar
%A H.L. Legu赤a
%A E.E. Alessandria
%J Agriscientia
%D 2008
%I 
%X Se estudi車 el efecto de la secuencia de cultivos, la inoculaci車n y la fertilizaci車n sobre la nodulaci車n y el rendimiento del cultivo de soja, en sistemas agr赤colas extensivos del 芍rea central de C車rdoba. La experiencia se desarroll車 durante dos campa as con distinto nivel de estr谷s h赤drico, bajo siembra directa con secuencias soja-soja y ma赤z-soja, donde se evalu車 el efecto de la aplicaci車n de fertilizante no nitrogenado e inoculante. Durante la etapa R5 del cultivo se midieron n迆mero y peso fresco de n車dulos en ra赤ces principal y secundarias y porcentaje de n車dulos funcionales; adem芍s, se evalu車 el rendimiento de granos y morfolog赤a de ra赤ces. El peso promedio de los n車dulos de la ra赤z principal fue la variable m芍s sensible a las diferentes pr芍cticas culturales. La rotaci車n ma赤z-soja fue el principal factor que favoreci車 al sistema nodular. Para la mayor赤a de las variables, los efectos de pr芍cticas como fertilizaci車n e inoculaci車n no resultaron significativos. En la campa a h迆meda los n車dulos de la ra赤z principal pesaron el doble que en la campa a seca. Los rendimientos no mostraron diferencias entre tratamientos ni correlacionaron con los patrones de nodulaci車n. La mayor nodulaci車n se present車 en lotes de menor disponibilidad de nitr車geno. This study examines the effect of crop sequence, inoculation and fertilization on the behavior of nodulation and soybean yield in extensive farming systems of the central area of Cordoba. The experience was developed during two campaigns with different hydric stress levels, in fields under no-tillage systems, both in the soybean-soybean and corn-soybean sequences. The effect of the application of no nitrogen fertilizers and inoculate were analyzed. During the R5 soybean growth stage the number and fresh weight of nodules in main and secondary roots and the percentage of functional nodules were measured; grain yield and root morphology were also evaluated. The average weight of the main root nodules was the most sensitive variable to the different cultural practices. The corn-soybean rotation was the main factor that favored the nodular system. The effect of fertilization and inoculation was not significant for most of the variables measured. The weight of main root nodules during the wetter campaign, was double that in the dry campaign. Grain yields did not show differences between the treatments considered nor were they correlated with nodulation patterns. The greatest nodulation appeared in fields with less nitrogen availability.
%K Nodulaci車n
%K Fertilizaci車n
%K Inoculaci車n
%K Secuencia de cultivos
%K Soja
%K Nodulation
%K Fertilization
%K Inoculation
%K Crops sequence
%K Soybean
%U http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1668-298X2008000200004