Author:
Garwood E. A.,Williams T. B.
Abstract
1. Plant nutrients, N, P and K, were applied to the soil surface or injected at a depth of 18 in. or 30 in. in perennial ryegrass swards, when the upper horizons of the soil profile were dry.2. When the surface soil was dry and a soil water deficit of 2 in. existed there was no response to surface applied N but injection of N into moist soil at a depth of 18 in. produced a marked increase of growth. At this depth of injection there was a significant positive interaction between N and PK.3. There was a substantial recovery in the herbage (59–80%) of the nitrogen applied to the subsoil, provided water was available in the soil horizon in which the nitrogen was applied.4. Failure of a grass sward to regrow after cutting when the water available to the plant has been removed from the uppermost soil horizons is largely due to a deficiency of plant nutrients in the subsoil. The major deficiency is that of nitrogen.
Publisher
Cambridge University Press (CUP)
Subject
Genetics,Agronomy and Crop Science,Animal Science and Zoology
Reference13 articles.
1. THE NITROGEN ECONOMY OF GRASS LEGUME ASSOCIATIONS
2. EFFECT OF DEFOLIATION AND SOIL MOISTURE ON GRASSLAND RE-GROWTH
3. On an electrical resistance technique for the study of soil moisture problems in the field;Farbrother;Emp. Cott. Grow. Rev.,1957
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