The response of green bean (Phaseolus vulgaris L.) to plant growth-promoting bacteria, plant density and weed competition: focusing on the characteristics of photosynthetic and non-photosynthetic pigments and yield
Subject Areas : MorphophysiologicalArastoo Abbasian 1 * , Mehdi Yosefpour 2 , Rahmat Abbasi 3 , Seyyed Jaber Hosseini 4
1 - Department of Agronomy, Faculty of Agriculture, Sari University of Agricultural Sciences and Natural Resources, Mazandaran, Iran
2 - Department of Agronomy, Faculty of Agriculture, Sari University of Agricultural Sciences and Natural Resources, Mazandaran, Iran
3 - Department of Agronomy, Faculty of Agriculture, Sari University of Agricultural Sciences and Natural Resources, Mazandaran, Iran
4 - Department of Agronomy, Faculty of Agriculture, Sari University of Agricultural Sciences and Natural Resources, Mazandaran, Iran
Keywords: legumes, weed, phosphorus, carotenoid, chlorophyll, nitrogen, ,
Abstract :
The present study was conducted to investigate the effects of weeding, bacterial inoculation and plant density treatments on yield and physiological characteristics of green bean under field conditions in the 2020 crop year. The experiment was conducted as a factorial based on randomized complete block design with three replications. Experimental treatments included plant density (16, 20 and 24 plants per square meter), inoculation of growth- promoting bacteria (inoculation and non-inoculation) and weeding (weeding and non-weeding). The results showed that the triple interaction was significant for the traits of chlorophyll a, b and total chlorophyll, ratio of total chlorophyll to carotenoid, leaf phosphorus and potassium content. The treatment of non-weeding + density of 20 plants per square meter + bacterial inoculation (13.59 μg/ml) had the highest amount of total chlorophyll. The highest amount of carotenoid was related 24 plants per square meter density + non-inoculation (2.60 μg/ml), while the lowest amount of carotenoid was observed in 16 plants per square meter density + non-inoculation (0.87 μg/ml). The highest amount of leaf phosphorus content (0.49 mg/g dry weight) was observed in weeding + 24 plants per square meter density+ non-inoculation treatment. The highest amount of leaf potassium (0.84 mg/g dry weight) was related to the treatment of non-weeding + 24 plants per square meter density + non-inoculation. The treatment with bacterial inoculation + density of 24 plants per square meter had the highest amount of pod fresh weight (9.38 tons per hectare), while the lowest value (4.24 tons per hectare) was observed in the non-inoculation + density of 16 plants per square meter treatment. Also, interaction between weeding and plant density showed that the weeding + 24 plants per square meter density had the highest pod fresh weight (8.36 tons per hectare).