IFEVA   02662
INSTITUTO DE INVESTIGACIONES FISIOLOGICAS Y ECOLOGICAS VINCULADAS A LA AGRICULTURA
Unidad Ejecutora - UE
artículos
Título:
Wheat development as affected by nitrogen and sulfur nutrition
Autor/es:
SALVAGIOTTI F; MIRALLES DJ
Revista:
AUSTRALIAN JOURNAL OF AGRICULTURAL RESEARCH
Editorial:
CSIRO
Referencias:
Lugar: Melbourne; Año: 2007 vol. 58 p. 39 - 45
ISSN:
0004-9409
Resumen:
Abstract. Sulfur (S) is one of the essential nutrients for crop growth,which is linked to nitrogen (N) in many physiological
functions. The rate of leaf emergence (RLE) and final leaf number (FLN) determine the duration of the emergence (Em)
anthesis (Ant) period in wheat. Although some studies showed effects of N and phosphorus on RLE and the length of
the EmAnt period, no reports studied the effect of N and S interaction on the phasic development and the coordination
of RLE with tillering appearance. A bread-wheat genotype was grown with 4 N and 2 S fertiliser rates during 2000 and
2001 in field plots. In addition, an experiment with 4 combinations of N and S rates (N0S0, N0S1, N1S0, and N1S1) was
arranged in containers using nutrient solutions in 2001. Under field conditions, additional N and S did not modify the
duration of the different phenological stages or the Phy value and FLN. However, the stronger N and S deficiency in the
experiments conducted in containers affected RLE. A higher S rate delayed the period EmAnt by 65◦ degree-days under
no N restrictions, mainly by a delay in the duration of terminal spikelet (TS)Ant period. Phyllochron (Phy) changed with
crop ontogeny (inflection point occurred on 7th leaf) and N and S did not affect the timing when Phy changed; however,
a lower N supply increased Phy in earlier leaves without effect of S on this trait. Treatments without S or N deficiency
achieved the highest maximum tiller number (MTN) and the greatest tiller mortality rate (TMR); however, tiller number
at maturity was 76% higher in this treatment with respect to the rest of the treatments because of the MTN attained. The
number of tillers per emerged leaf was significantly increased when plants were grown under high N supply. Under no N
restrictions, additional S increased the number of tillers per emerged leaf by 24%.
no N restrictions, mainly by a delay in the duration of terminal spikelet (TS)Ant period. Phyllochron (Phy) changed with
crop ontogeny (inflection point occurred on 7th leaf) and N and S did not affect the timing when Phy changed; however,
a lower N supply increased Phy in earlier leaves without effect of S on this trait. Treatments without S or N deficiency
achieved the highest maximum tiller number (MTN) and the greatest tiller mortality rate (TMR); however, tiller number
at maturity was 76% higher in this treatment with respect to the rest of the treatments because of the MTN attained. The
number of tillers per emerged leaf was significantly increased when plants were grown under high N supply. Under no N
restrictions, additional S increased the number of tillers per emerged leaf by 24%.
functions. The rate of leaf emergence (RLE) and final leaf number (FLN) determine the duration of the emergence (Em)
anthesis (Ant) period in wheat. Although some studies showed effects of N and phosphorus on RLE and the length of
the EmAnt period, no reports studied the effect of N and S interaction on the phasic development and the coordination
of RLE with tillering appearance. A bread-wheat genotype was grown with 4 N and 2 S fertiliser rates during 2000 and
2001 in field plots. In addition, an experiment with 4 combinations of N and S rates (N0S0, N0S1, N1S0, and N1S1) was
arranged in containers using nutrient solutions in 2001. Under field conditions, additional N and S did not modify the
duration of the different phenological stages or the Phy value and FLN. However, the stronger N and S deficiency in the
experiments conducted in containers affected RLE. A higher S rate delayed the period EmAnt by 65◦ degree-days under
no N restrictions, mainly by a delay in the duration of terminal spikelet (TS)Ant period. Phyllochron (Phy) changed with
crop ontogeny (inflection point occurred on 7th leaf) and N and S did not affect the timing when Phy changed; however,
a lower N supply increased Phy in earlier leaves without effect of S on this trait. Treatments without S or N deficiency
achieved the highest maximum tiller number (MTN) and the greatest tiller mortality rate (TMR); however, tiller number
at maturity was 76% higher in this treatment with respect to the rest of the treatments because of the MTN attained. The
number of tillers per emerged leaf was significantly increased when plants were grown under high N supply. Under no N
restrictions, additional S increased the number of tillers per emerged leaf by 24%.
no N restrictions, mainly by a delay in the duration of terminal spikelet (TS)Ant period. Phyllochron (Phy) changed with
crop ontogeny (inflection point occurred on 7th leaf) and N and S did not affect the timing when Phy changed; however,
a lower N supply increased Phy in earlier leaves without effect of S on this trait. Treatments without S or N deficiency
achieved the highest maximum tiller number (MTN) and the greatest tiller mortality rate (TMR); however, tiller number
at maturity was 76% higher in this treatment with respect to the rest of the treatments because of the MTN attained. The
number of tillers per emerged leaf was significantly increased when plants were grown under high N supply. Under no N
restrictions, additional S increased the number of tillers per emerged leaf by 24%.
Sulfur (S) is one of the essential nutrients for crop growth,which is linked to nitrogen (N) in many physiological
functions. The rate of leaf emergence (RLE) and final leaf number (FLN) determine the duration of the emergence (Em)
anthesis (Ant) period in wheat. Although some studies showed effects of N and phosphorus on RLE and the length of
the EmAnt period, no reports studied the effect of N and S interaction on the phasic development and the coordination
of RLE with tillering appearance. A bread-wheat genotype was grown with 4 N and 2 S fertiliser rates during 2000 and
2001 in field plots. In addition, an experiment with 4 combinations of N and S rates (N0S0, N0S1, N1S0, and N1S1) was
arranged in containers using nutrient solutions in 2001. Under field conditions, additional N and S did not modify the
duration of the different phenological stages or the Phy value and FLN. However, the stronger N and S deficiency in the
experiments conducted in containers affected RLE. A higher S rate delayed the period EmAnt by 65◦ degree-days under
no N restrictions, mainly by a delay in the duration of terminal spikelet (TS)Ant period. Phyllochron (Phy) changed with
crop ontogeny (inflection point occurred on 7th leaf) and N and S did not affect the timing when Phy changed; however,
a lower N supply increased Phy in earlier leaves without effect of S on this trait. Treatments without S or N deficiency
achieved the highest maximum tiller number (MTN) and the greatest tiller mortality rate (TMR); however, tiller number
at maturity was 76% higher in this treatment with respect to the rest of the treatments because of the MTN attained. The
number of tillers per emerged leaf was significantly increased when plants were grown under high N supply. Under no N
restrictions, additional S increased the number of tillers per emerged leaf by 24%.
no N restrictions, mainly by a delay in the duration of terminal spikelet (TS)Ant period. Phyllochron (Phy) changed with
crop ontogeny (inflection point occurred on 7th leaf) and N and S did not affect the timing when Phy changed; however,
a lower N supply increased Phy in earlier leaves without effect of S on this trait. Treatments without S or N deficiency
achieved the highest maximum tiller number (MTN) and the greatest tiller mortality rate (TMR); however, tiller number
at maturity was 76% higher in this treatment with respect to the rest of the treatments because of the MTN attained. The
number of tillers per emerged leaf was significantly increased when plants were grown under high N supply. Under no N
restrictions, additional S increased the number of tillers per emerged leaf by 24%.
◦ degree-days under
no N restrictions, mainly by a delay in the duration of terminal spikelet (TS)Ant period. Phyllochron (Phy) changed with
crop ontogeny (inflection point occurred on 7th leaf) and N and S did not affect the timing when Phy changed; however,
a lower N supply increased Phy in earlier leaves without effect of S on this trait. Treatments without S or N deficiency
achieved the highest maximum tiller number (MTN) and the greatest tiller mortality rate (TMR); however, tiller number
at maturity was 76% higher in this treatment with respect to the rest of the treatments because of the MTN attained. The
number of tillers per emerged leaf was significantly increased when plants were grown under high N supply. Under no N
restrictions, additional S increased the number of tillers per emerged leaf by 24%.
Additional keywords: phyllochron, tillering.phyllochron, tillering.