Abdollah fariSa; Ali Nakhzari Moghaddam; ali Rahemi karizaki; Mohammad Salahi Farahi
Abstract
Objective: In order to study the effect of nitrogen splitting and supplemental irrigation on yield, yield components and oil percentage of sunflower a factorial experiment was conducted based on randomized complete block design on farm research of Gonbad University with three replications during crop ...
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Objective: In order to study the effect of nitrogen splitting and supplemental irrigation on yield, yield components and oil percentage of sunflower a factorial experiment was conducted based on randomized complete block design on farm research of Gonbad University with three replications during crop year of 2019.Methods: Treatments in this experiment included nitrogen splitting (none consumption of nitrogen (as control), 25% of nitrogen at planting time and 75% before flowering, 50% of nitrogen at planting time and 50% before flowering and 75% of nitrogen at planting and 25% before flowering and supplemental irrigation (none irrigation ((as control)), supplementary irrigation at flowering stage, supplemental irrigation at grain filling stage, supplemental irrigation at flowering stage and grain filling stages) in four levels.Results: The results showed that consumption of 25% nitrogen at planting time and 75% before flowering led to the highest increase in number of grains per row, number of grains per head, one thousand-grain weight, grain yield (4318 kg.ha-1) and harvest index. Consumption of 75% nitrogen at planting time and 25% before flowering increased the number of rows per capita. None consumption of nitrogen increased oil percent though oil yield decreased. Irrigation at flowering and grain filling stages increased the number of grain per capita, grain weight, and grain yield (4427 kg.ha-1).Conclusion: According to the results, irrigation at flowering and grain filling stages as well as application of 25% nitrogen at planting time and 75% before flowering is suitable to achieve optimum sunflower yield.
Raouf Seyed sharif; reza seyed sharifi; Hamed Narimani
Abstract
In order to study the effect of methanol and seed inoculation with plant growth promoting rhizobacteria on grain filling components, chlorophyll content and grain yield of safflower (Carthamus tinctorius L.) under various irrigation levels, a factorial experiment has been conducted based on randomized ...
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In order to study the effect of methanol and seed inoculation with plant growth promoting rhizobacteria on grain filling components, chlorophyll content and grain yield of safflower (Carthamus tinctorius L.) under various irrigation levels, a factorial experiment has been conducted based on randomized complete block design with three replications at the research farm of University of Mohaghegh Ardabili in 2020. The experimental factors include irrigation (full irrigation as control, irrigation withholding at 50% heading-bud, and flowering stages), biofertilizers application (no application as control, seed inoculation with Flavobacterium, Pseudomonas and both application of Flavobacterium and Pseudomonas), and methanol foliar application: (foliar application with water as control and foliar application with 10% and 20% volume of methanol). The results show that the content chlorophyll a (41.57%), b (74.59%) and total chlorophyll (49.33%), grain filling period, and effective grain filling period (27.32% and 72.89% respectively) and grain yield (69.2%) have increased under full irrigation condition, foliar application 20% volume of methanol, and both application of Flavobacterium with Pseudomonas in comparison with irrigation withholding at 50% heading-bud and no application of biofertilizers and methanol. Generally, the results show that application of plant growth-promoting bacteria and methanol can increase grain yield of safflower by improving chlorophyll content and grain filling components under water limitation condition.