GROWTH AND NUTRITION OF TIMOTHY (PHLEUM PRATENSE L.) III. ABSORPTION AND DISTRIBUTION OF NITROGEN, PHOSPHORUS AND POTASSIUM DURING THE FIRST YEAR OF GROWTH

Abstract

Absorption of nitrogen, phosphorus and potassium by S48 timothy plants ran parallel to dry‐weight increase, at an increasing rate until the autumn, almost completely ceasing in the winter, and increasing again in the spring. Flowering tillers accumulated nutrients until ear emergence, after which the content per tiller of all nutrients decreased until death of the tillers during the winter. Non‐flowering tillers continued to accumulate nutrients steadily throughout the whole period of the experiment. These observations are discussed in relation to the perennial habit of the plant.

Diagnostic de la nutrition minérale de prairies permanentes au printemps. I. Établissement de références

“…(Lemaire et al, 1985). La même approche a été réalisée pour les teneurs en P et K de graminées fourragères (Salette, 1982;Salette et al, 1982;Salette et Huché, 1989 (Williams, 1957). Dans notre situation, l'épiaison du dactyle a lieu à la première dé-cade du mois de juin (Duru et Gibon, 1989 (Callot et al, 1982;Claasen et al, 1986), du mm pour P (Callot et al, 1982).…”

FERTILE TILLER PRODUCTION AND SEED YIELD IN MEADOW FESCUE (FESTUCA PRATENSIS L.)

“…This is to be expected when consideration is given to the annual sequence of tiller production in the grass crop. Williams (16) has shown that the growth of the grass plant follows a distinct sequence. Successive groups of short-lived tillers are produced, each group tending to he larger in number, but composed of tillers of reduced size.…”

Effect of tiller age and time of nitrogen stress on seed production of Paspalum plicatulum

“…In plicatulum, nitrogen uptake by fertile tillers compared with vegetative tillers was reduced in Henzell & Oxenham's experiment (1964). Similarly, Williams (1957) showed that flowering tillers of timothy take up nitrogen at an increasing rate until about the time of ear emergence, when accumulation of the element ceases.…”