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Influence of Nitrogen Fertilization, Gapping, and Burning on Seed Production of Newport Kentucky Bluegrass 1
Author(s) -
Evans David W.,
Canode C. L.
Publication year - 1971
Publication title -
agronomy journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.752
H-Index - 131
eISSN - 1435-0645
pISSN - 0002-1962
DOI - 10.2134/agronj1971.00021962006300040019x
Subject(s) - panicle , nitrogen , human fertilization , poa pratensis , agronomy , biology , nitrogen fertilizer , yield (engineering) , zoology , horticulture , poaceae , chemistry , physics , fertilizer , organic chemistry , thermodynamics
A study was conducted to determine the influence of nitrogen fertilization, gapping and burning on the seed yields and age‐associated seed yield decline of ‘Newport’ Kentucky bluegrass ( Poa pratensis L.). The bluegrass was grown in rows under furrow irrigation. Treatments were applied in a split‐split plot design. Increasing the rate of nitrogen fertilization increased seed yields, seed weight per panicle, panicle numbers, and weight of 100 seeds. Weight of 100 seeds was least affected. Gapping by removing alternate 30‐cm sections of the row in late summer of alternate years reduced panicle numbers but increased seed weight per panicle in the year following treatment. Panicle numbers were reduced more by gapping at high than at low rates of nitrogen fertilization. Seed yields were increased by gapping at the low nitrogen rates but not at the high rates. Burning yearly after harvest had variable effects. The drop in seed yield associated with increased stand age was not prevented by any treatment.