Studies on the nitrogen and water relations of wheat. II. Effects of varying nitrogen and water supply on growth and grain yield

Parameswaran, K.V.M.; Graham, R.D.; Aspinall, D.

Irrigation Science 5(2): 105-121

1984


ISSN/ISBN: 0342-7188
DOI: 10.1007/bf00272549
Accession: 001257651

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Abstract
Wheat was grown in field and greenhouse experiments to assess the effect of N fertilizer on yield when water stress occurred in the later half of the growth. N application was deferred until the main culm apex of the plant was at the double-ridge stage of development. In the greenhouse water stress was imposed by altering the watering regime; in the field it was anticipated as naturally occurring and compared with an irrigated control. The response to deferred N was much stronger at adequate water supply giving rise to a significant positive N x W interaction effect, which shown by number of ears, LAI, green area duration, water use, root growth and grain yield. In both the greenhouse and field, N increased post-anthesis green area duration (PGD) which was highly correlated with grain yield, but since the components of grain yield determining the response to N were largely established by anthesis (number of ears), PGD did not appear to increase grain yield, which was rather caused by increased survival of tillers. In concert with its effect on PGD, deferred N resulted in greater root survival and/or growth at deeper layers late in the season. Water stress as measured in these experiments was insufficient to cause decreases in yield from use of N at low water supply. However, in the field N application did lower plant water potential late in the growing season.

Studies on the nitrogen and water relations of wheat. II. Effects of varying nitrogen and water supply on growth and grain yield