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Atmospheric Conditions Influencing Pollen Shedding of Hops ( Humulus lupulus L .) 1
Author(s) -
Brooks S. N.,
Puri Y. P.
Publication year - 1963
Publication title -
crop science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.76
H-Index - 147
eISSN - 1435-0653
pISSN - 0011-183X
DOI - 10.2135/cropsci1963.0011183x000300060022x
Subject(s) - technician , humulus lupulus , crop , library science , agricultural science , biology , horticulture , political science , agronomy , computer science , law , pepper
S. N. Brooks and Y. P. Puri MALE hops normal ly shed pollen dur ing daylight, beginning after 7 a.m., reaching a peak in the late morning or early afternoon, and ending in late afternoon. The time at which most pollen is shed depends on atmospheric conditions. On some days the peak will be reached about 11 a.m. and on others after 3 p.m. Usually when the peak pollen-shedding period is delayed until mid-afternoon, the density curve has two peaks, one between 8 and 11 a.m. and the other, a higher peak, in the afternoon (Figure 1). Because collection of pollen is a vital operation in hop breeding, a study was conducted from 1959 to 1961 to determine the effect of a tmospher ic conditions on the amount of pollen shed by male hop lines and the time at which pollen density in the air was the greatest. The purpose of this paper is to present the results of that study and to develop therefrom a means of predicting the time of maximum pollen shedding.