Document Type : Research Paper
Authors
1 PHD. Student, Department of Agronomy Sciences and Plant Breeding, College of Aburaihan, University of Tehran, Pakdasht, Iran.
2 Associate Professor, Department of Agronomy and Plant Breeding Sciences, College of Aburaihan, University of Tehran, Pakdasht, Iran
3 Associate Professor, Department of Agronomy Sciences and Plant Breeding, College of Aburaihan, University of Tehran, Pakdasht, Iran.
Abstract
This research was carried out in the form of split-split plotin the form of a randomized complete block design with three replications in the year 2021 in the Aburihan campus research farm located in Pakdasht. In this study, irrigation cycle in three levels (once every 7 days, once every 10 days and once every 13 days) as the main factor, planting date in two levels (5 June and 22 June) as secondary factor and fertilizing with bio fertilizers In four level including control (without biofertilizer), Shift biofertilizer, Chris biofertilizer and the combination of Shift and Chris biofertilizers as sub-factors were considered. The results of the research showed that the plants cultivated on June 22 were superior to the plants cultivated on June 5 in all investigated traits (including yield components, seed yield, and biological yield) and in all three tested irrigation levels. The seed yield, under different research treatments, has shown a consistent correlation with the number and weight of seeds. In other words, with increasing levels of drought stress, the seed yield has significantly decreased in both planting dates under investigation. However, the ratio of seed yield reduction under drought stress was significantly lower in plants cultivated on June 22st compared to those cultivated on June 5th.The application of biofertilizers, especially Chris biofertilizer, significantly reduced the effects of stress on grain yield, biological yield, and oil percentage in seed Niger
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