A Study of the Factors Effecting the Ability of Roses to Withstand Controlled Low Temperatures

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Cornell Univ., Feb., 1951 - Roses - 224 pages
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Contents

IHTRODUCTIOJT
1
M3 Factors effecting winter hnrdineea and frost injury
13
МАИШАЪЗ АЯ KETRODS
26
RESULTS
31
meriment 5 Hardiness of different portions
54
Factors effecting inter hardiness and frost injury
65
B Effect of the reduction of photo synthetic area
68
Bffeot of the length of day upon the hardening
73
Effect of length of day on hardiness of Frau Karl
79
The effect of the reduction of soil moisture
83
1 Effect of nitrogen levels on the ability of rose
90
DISCUSSIO¤
95
SUMMART
103

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