. Bulletin. Natural history; Natural history. Aug., 1974 BoRN: Root Infection wtth V. alho-atrum 233 & E â 10-. 35- GREEN ASH ^ /^ j/^ X y' E >^ ^ 25- y^ O y^ y' I "^ y S 5; '5- ^â¢^ z / ^ S 10- //â ''' 5- 14 28 42 56 70 84 99 112 DAYS 28 42 56 70 84 98 112 DAYS Fig. 14.âInfluence of root infection on stem height of redbud and green ash seedlings after inoculation with V. albo-afrum. Table 10.âInfluence of root infection on total nitrogen content of leaves, stems, and roots of redbud and green ash seedlings. Total Nitrogen (percent dry iveight) Redbud Green Ash InoculaUon Noninocul
. Bulletin. Natural history; Natural history. Aug., 1974 BoRN: Root Infection wtth V. alho-atrum 233 & E â 10-. 35- GREEN ASH ^ /^ j/^ X y' E >^ ^ 25- y^ O y^ y' I "^ y S 5; '5- ^â¢^ z / ^ S 10- //â ''' 5- 14 28 42 56 70 84 99 112 DAYS 28 42 56 70 84 98 112 DAYS Fig. 14.âInfluence of root infection on stem height of redbud and green ash seedlings after inoculation with V. albo-afrum. Table 10.âInfluence of root infection on total nitrogen content of leaves, stems, and roots of redbud and green ash seedlings. Total Nitrogen (percent dry iveight) Redbud Green Ash InoculaUon Noninoculated Inoculated Noninoculated In ocnlated 14 56 112 14 56 112 14 56 112 Leaves Stems Roots Hon and movement; b) obstruction to the uptake and translocation of mineral nutrients; and c) production of toxic substances. The data have been ex- amined in the light of these hypotheses. Infection leads to a drastic reduction in dry-matter production of all parts of the plant. The greatest effect of infection was a reduction in stem height and leaf area. Total leaf area decreased significantly in the inoculated plant when compared with the control. The number of leaves per plant exhibited only a slight initial reduction and there- after was little affected. Nitrogen is one of the most important major nutrients affecting leaf expansion, but there was no evidence of a reduc- tion in the uptake of nitrogen. Fre- quently, the nitrogen content was higher in the infected plants than in the control plants. The results are sur- prising since the root system is the first part of tlie plant to be affected by the. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble th
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