The effects of ammonium and nitrate nitrogen on the growth of perennial rye grass

Abstract

The results show clearly a more rapid and greater uptake of ammonium than of nitrate nitrogen by perennial rye grass grown in a sand-bentonite medium of pH 7·61. The extent to which the extra uptake with added ammonia was reflected in increased yields was dependent upon the age of the grass.Except in the very early stages the percentage nitrogen content of the herbage was higher where nitrate nitrogen was applied than where ammonium nitrogen was applied. This indicates that any nitrate absorbed by the plant was less, efficient in increasing yields than was ammonium nitrogen.The percentage P205 content of the grass was higher where the nitrogen was applied in the ammoniacal form than where it was applied as nitrate, and it appears that this greater P205 uptake with ammonium nitrogen resulted in increased growth.

ASSIMILATION OF AMMONIUM AND NITRATE NITROGEN FROM SOLUTION CULTURES BY ROOTS OF PANDANUS VEITCHI HORT., AND DISTRIBUTION OF THE VARIOUS NITROGEN FRACTIONS AND SUGARS IN THE STELE AND CORTEX

“…Ammonium more than nitrate, owing to its greater degree of assimilability (7,9,13,26,64,65), produces larger quantities of such fractions of soluble organic nitrogen as mono-amino and basic nitrogen at the terminal region of the main root. The quantities of similar fractions of soluble organic nitrogen appear to increase more in the intermediate tissues of the main root of plants grown in nitrate than in the comparable region of those grown in ammonium cultures.…”

THE USE OE FERTILIZERS ON HERBAGE CUT EOR CONSERVATION Part IV

“…As shown by the different types of cutting {Table 1) increased shading by grasses may depress the yield of clovers markedly. Lewis (13) noted that sulphate of ammunia gave higher yields of dry matter, a slightly lower percentage nitrogen but higher yields of nitrogen in perennial ryegrass than sodium or calcium nitrates. He discounted the possibility of the benefit being due to the sulphate ion in his trials because the sulphur contents in the dry matter were similar, but in some instances the sulphur contained in sulphate of ammonia may be of some importance.…”

The value of liquid digested sewage sludge. I. The effect of liquid sewage sludge on growth and composition of grass-clover swards in South-east England

“…In a trial on barley (Coker, 19666) the author found that more nitrogen was absorbed from liquid digested sludge than from fertilizers during the early stages of growth, but the reverse applied later in the season; Thome (1962) showed that a given amount of fertilizer nitrogen applied early to barley produced a greater dryweight increase than later applications, by increasing the area of the leaves. Richardson (1934) concluded that grass absorbed ammonia directly, and Lewis (1936) found that ammonia nitrogen was more effective in increasing the grass dry-matter than nitrate nitrogen; the sludge which was used contained a high percentage of ammonia but little nitrate.…”