The nitrogen content of Poa pratensis: its range and relation to flowering date
1941
Sullivan, J.T. | Garber, R.J.
Data are presented showing the range in variation of Kentucky bluegrass plants under a similar environment. Late-flowering plants were higher in nitrogen than plants flowering only a few days earlier when studied (a) during the flowering period, (b) several months later in the aftermath stage, and (c) when clonal isolations were grown in the greenhouse. Within one group of plants, studied two years on different pieces of ground, a small but significant correlation (r = +0.287; 1.0% pt. = 0.228) was found for the nitrogen content for the two years. A small but significant correlation (r = +0.488; 1.0% pt. = 0.449) was found between the nitrogen content of plants in the greenhouse and that in the field for 32 clones representing extremes of flowering dates and composition in the field. A negative correlation between the nitrogen content and the yield of 32 clones in the greenhouse was highly significant (r = -0.906; 1.0% pt. = 0.449).
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