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Barley Yields and Tissue N, P, and K with High‐Low N Supply for Different Growth Periods 1
Author(s) -
Suzuki Michio,
MacLeod L. B.
Publication year - 1977
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/agronj1977.00021962006900040042x
Subject(s) - tiller (botany) , agronomy , yield (engineering) , grain yield , biology , maturity (psychological) , growth rate , main stem , zoology , horticulture , mathematics , physics , psychology , developmental psychology , geometry , thermodynamics
Grain production with minimum use of N has been a major concern of producers. Since physiological characteristics of a barley plant having high N utilization efficiency (grain yield/supplied N) have not been fully elucidated, grain yields and chemical components of Herta barley ( Horedum distichon L.) from hydroponic cultures with high and low N supply for different growth periods were determined. A high rate of N at 75 ppm was applied for 0 (check), 1, 2, 3, 4, 5, 6, 7, and 12 weeks after emergence and low rate of N at 20 ppm for the remaining period to maturity. The highest grain yield and N utilization efficiency occurred by supplying the high rate of N for 5 weeks after emergence. In the primary tiller of the productive and efficient plant at 9 weeks after emergence the leaf‐to‐stem‐N ratio was approximately 7:3, and the P concentrations of the fifth leaf was twice as high as of the second top leaf. This study suggests that an ideal N supply would involve applications of a low rate of N for 1 week after emergence, a high rate of N for the following 4 or 5 weeks until the first node of the stem becomes visible on the primary tiller and then a low rate of N for the remaining period to maturity.