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Grain Filling Period of Corn as Influenced by Phosphorus, Potassium, and the Time of Planting 1
Author(s) -
Peaslee D. E.,
Ragland J. L.,
Duncan W. G.
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/agronj1971.00021962006300040014x
Subject(s) - sowing , maturity (psychological) , agronomy , phosphorus , potassium , biology , field experiment , zoology , chemistry , psychology , developmental psychology , organic chemistry
Grain production of field‐grown corn ( Zea mays L.), as it related to the degree‐days 3 occurring between initiation and maturity of the grain, was evaluated at O, 22, and 112 kg/ha of P and O, 56, and 224 kg/ha of K nutrition and with planting dates of April 7 and May 26. High levels of P accelerated development to silking but had little effect upon maturity of the grain. High levels of K accelerated development to silking and delayed grain maturity. Without added P and K, silking was delayed a maximum of 7 days in plots planted May 26, whereas maturity of the grain was accelerated 7 days. The number of degreedays between emergence and silking and between emergence and maturity were correlated (R2 = 0.58 to 0.87) with levels of applied P and K. The degree‐days between silking and maturity were also correlated with applied P and K (R 2 = 0.61 and 0.81) and with grain yields (r2 = 0.62 and 0.71). These data indicate that nutrition influenced the rates at which corn plants developed through certain stages, and that the changes in these rates of development were associated with differences in grain yields.