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Information Journal Paper

Title

EFFECT OF DROUGHT STRESS AND BIOFERTILIZERS ON SOME PHYSIOLOGICAL CHARACTERISTICSAND GRAIN YIELD OF MEDICINAL PUMPKIN PLANTS

Pages

 Start Page 205 | End Page 217

Abstract

 In order to study the effects of biofertilizers on the PHOTOSYNTHETIC PIGMENTS, RELATIVE WATER CONTENT(RWC) and grain yield in medicinal pumpkin plants under drought stress condition, experiments wereperfumed across two years at research field station of Zanjan University. This experiment was conductedas a split plot based on randomized complete blocks design with three replications. The experimenttreatments consisted of drought stress as a main plot in four levels (i. e., control, mild stress, moderatestress and severe stress and biofertilizers as a sub-plot (i. e., no inoculation (control), nitroxin, mycorrhizha and thiobacillus)). Results of combined analysis of variance showed a significant associationbetween IRRIGATION REGIMES and biofertilizers in terms of chlorophyll a, b and grain yield. Under severestress condition, nitroxin induced 15. 78% and 40% growth in terms of chl a and chl b contents andmycorrizha treatment induced 21% and 47% growth in terms of chl a and chl b contents in comparisonwith the control, respectively. Only mycorrizha treatment had a positive effect on the RWC andcarotenoid content (increased 19% and 5. 58% in comparison with no inoculation). Regarding positiveeffects of nitroxin treatment on increasing of grain yield (under moderate and severe stress condition, caused to 13% and 12. 6 % increases in grain yield in comparison with the control, respectively), low costand easy application, use of mentioned treatment can be recommended.

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