|
KMID : 0903619750160010036
|
|
Journal of the Korean Society for Horticultural Science
1975 Volume.16 No. 1 p.36 ~ p.47
|
|
|
Effects of N , P and K Levels on Cold Resistance of Miyagawa - Wase Satsuma Orange and Freezing Test of Citrus Trees
|
|
|
|
|
Abstract
|
|
|
This study was carried out to find out the effect of N,P and K fertilization levels on cold resistance on the transplanted 2-year-old $quot;Miyagawa-wase$quot; Satsuma orange (Citrus unshiu MAR.), and to elucidate the degree of cold resistance on the leading species and varieties of citrus growing in Cheju-do.
A slight increasing tendency was recognized in growth of spring-cycle shoots as related to higher fertilization levels. On the other hand, growth of summer-cycle shoots and increment of trunk diameter decreased significantly. Internodal growth was in directly proportional to shoot growth and dry weight of the leaf dwindled with more fertilization.
Nitrogen content of the spring-cycle leaf was more than that of summer-cycle one, and it was decreased according to more fertilization. No difference was found among treatments in P content, the highest K content was in the ½N plot, and decreasing tendencies were recognized in leaf Ca and Mg. A close relationship was found between the content of total carbohydrate and cold resistance, judged by the former was lessening with an increase of fertilization.
From the results of the TTC and viability test, the most desirable treatment to overcome winter injury was ½N, but its resistance was weakened with more fertilization.
In the comparison of cold resistance of citrus species, Satsuma orange and kumquat were the strongest, and Aosima and Okitsu-wase showed the most favorable resistance of all Satsuma oranges.
|
|
|
KEYWORD
|
|
|
|
|
|
FullTexts / Linksout information
|
|
|
|
|
|
Listed journal information
|
|
|
|
|