%0 Journal Article
%T Balance de nitr車geno en ma赤z forrajero con diferente fertilizaci車n y fase de rotaci車n con praderas
%A Am谷ndola-Massiotti
%A Ricardo
%A Cach-G車mez
%A Irack
%A 芍lvarez-S芍nchez
%A Edna
%A L車pez-Cruz
%A Irineo
%A Burgueˋo-Ferreira
%A Juan
%A Mart赤nez-Hern芍ndez
%A Pedro
%A Crist車bal-Acevedo
%A David
%J Agrociencia
%D 2011
%I Colegio de Postgraduados
%X the aim of this study ivas to evaluate the nitrogen (n) balance in soil during a crop cycle of forage maize (zea mays l.), in different phases of a rotation with pastures (pu) and with different rates of n fertilization (nf). nine treatments derived from the combination of two factors with three levels each were evaluated: 1) nf: 0 (n0), 100 (n100) and 200 (n200) kg n ha-1; and 2) pu: three and a half years of alfalfa (medicago sativa l.) associated with orchardgrass (dactylis glomerata l.) (p); three years of alfalfa associated with orchardgrass and a cycle of oats (avena sativa l.) associated with ryegrass (lolium multiflorum lam.) (pa); and two and a half years of alfalfa associated with orchardgrass, a cycle of maize and a cycle of oats associated with ryegrass (pma). the experimental design was split-plots in a randomized block design with three repetitions with up as a large plot and nf as a small plot. measurements included n extraction by the crop, n leaching and soil content. pu did not affect (p>0.05) any of the variables; nf had a linear effect (p≒0.05) on the extraction of n (in n0 274㊣ 15 kg n ha-1, 44.9 % less than n200) and leaching of n (98 ㊣19 kg n ha-1 in n100, 73 % less than n200). the levels of apparent effect of fertilization and fertilizer use efficiency were acceptable, but fertilization was not economically advisable. fertilization increased the amount of n leached, which is ecologically unfavorable. during the growing season of maize the amount of n in the soil was reduced, emphasizing the importance of legume pastures associated with grasses, to maintain high levels of productivity in this rotation.
%K zea mays l.
%K crop rotation
%K nitrogen balance
%K forage maize.
%U http://www.scielo.org.mx/scielo.php?script=sci_abstract&pid=S1405-31952011000200004&lng=en&nrm=iso&tlng=en