Growth parameters
It is evident from the data presented in Table 1 various growth parameters of French bean as influenced by both the factors
viz. variety and different levels of the organic nutrients. The highest plant height 32.4 cm was recorded in V
3 (Falguni) followed by 32.1 cm in V1 (Victoria) and the lowest plant height 29.8 cm was observed in V
2 (Shagun) but Shagun recorded significantly more number of primary branches per plant (7.0) than the Victoria (6.7) and Falguni (6.0). This variation could be due to genetic constituent of the varieties as well as the environmental adaptability,
Pandey et al., (2011), Barcchiya and Kushwah (2017) also reported the similar results in French bean. The maximum number of nodules, dry weight of nodules per plant (mg), minimum mean days to reach 50% flowering leading to early harvesting were observed in the variety V
1 (Victoria) followed by V
3 (Falguni) and V
2 (Shagun).
Das et al., (2018) also reported the more or less similar result regarding the number of nodules in Victoria, Falguni and Shagun. In this experiment, variation in number and dry weight of nodules in different varieties might be due to variation in combining ability of the particular genotype with the concerned strain of
Rhizobium phaseolin and PSB and as well as the experimental locations. On the other hand crop duration was longest in Shagun (111.9 DAS) followed by Victoria (108.1 DAS) and shortest in Falguni (105.3 DAS).
Regarding the various level of organic nutrients, the highest plant height and number of primary branches per plant was recorded in the treatment O
6 (Vermicompost +
Rhizobium + PSB + Sea weed extract) while the lowest height (30.0 cm) and number of primary branches (6.4) per plant was recorded in O
1 (FYM +
Rhizobium + PSB). Findings are in harmony with
Zahida et al., (2016) who reported that in plants treated with FYM showed the lesser height than the plants treated with Vermicompost. Highest number (19.0/plant) of nodules per plant was observed in O
4 (FYM +
Rhizobium + PSB + Sea weed extract) whereas highest nodule dry weight (22.6 mg/plant) was in O
6 (Vermicompost+
Rhizobium + PSB + Sea weed extract). Days to 50% flowering stage was observed early (52.7 DAS) in the treatment O
1 (FYM +
Rhizobium + PSB) while addition of Sea weed extract in treatment O
4 (FYM +
Rhizobium + PSB+ Sea weed extract) delayed the 50% flowering (55.2 DAS) which could be due to the longer vegetative phase aided by the bio stimulants. However, in treatment O
2 (Vermicompost+
Rhizobium + PSB) the harvesting stage reached early (61.2 DAS) which was at par with O
1 (61.2 DAS) and the days to 1
st harvesting was delayed by 3.1 days in treatment O
4 (64.3 DAS). While the crop duration according to the days to last harvesting was highest in O
6 (Vermicompost +
Rhizobium + PSB + Sea weed extract) and was lowest in O
1 (FYM +
Rhizobium + PSB).
Quality parameters
A perusal of data (Table 1) revealed that maximum vitamin A content was determined in variety, Victoria (619.5 IU) followed by Falguni (606.9 IU) and Shagun (588.8 IU). While highest ascorbic acid content in pod was observed in Shagun (18.7mg/100g) followed by Victoria (17.1mg/100g), Falguni (15.5mg/100g) and regarding protein content Falguni recorded maximum crude protein content (2.2%) in green pods followed by Shagun (2.0%) which was at par with Victoria (2.0%). The findings were also in harmony with
Das et al., (2018).
It is clear from the data (Table 1) that the addition of bio-stimulants has a synergistic effect on the quality attributes of French bean. In treatment combination O
1 (FYM +
Rhizobium + PSB) all the quality attributes like vitamin A, ascorbic acid and protein content of fresh pod is low as compared to the treatments containing bio-stimulants. Highest vitamin A (607.1 IU) and ascorbic acid (17.8 mg/100g) content was recorded in O
5 (Vermicompost +
Rhizobium + PSB + Humic acid), whereas protein content (2.1%) was more or less similar in all the treatments except in O
1 (FYM +
Rhizobium + PSB).
Yield parameters
The presented data (Table 2) concerning with the yield attributes of French bean depict that all the yield attributes like pod length (14.8 cm), pod width (0.8 cm), number of pods per plant (20.1), individual fresh pod weight (4.8 g), yield per plant (79.3 g) and total fresh yield per hectare (15.7 t/ha) were highest in the variety Victoria followed by Shagun and Falguni.
Considering the levels of organic nutrient sources yield attributing characters like pod length (14.2 cm) was maximum in O
1 which was at par with O
2 while pod width was found to be similar in the treatments O
2 (Vermicompost +
Rhizobium + PSB), O
4 (FYM +
Rhizobium + PSB + Sea weed extract) and O
6 (Vermicompost +
Rhizobium + PSB + Sea weed extract). The treatment O
2 (Vermicompost +
Rhizobium + PSB) resulted in the pods with lowest weight (4.4 g) and the highest individual pods weight (4.5 g) was recorded in O
6 (Vermicompost +
Rhizobium + PSB + Sea weed extract) which was at par with O
5 (Vermicompost+
Rhizobium + PSB + Humic acid). Highest number of pods per plant (20.2) was recorded in O
5 (Vermicompost +
Rhizobium + PSB + Humic acid) followed by O
6 (Vermicompost +
Rhizobium + PSB + Sea weed extract) and was the lowest in O
1 (FYM +
Rhizobium + PSB).
Sharma et al., (2017) reported the similar result regarding the yield of green pods per plant in Humic acid treatment. This could have been due to the positive effects exerted by Bio-stimulants on the growth and development of plant thereby improving the quantity and quality of yield
(Calvo et al., 2014).
Economics of treatments
From the economic evaluation of fresh pod production (Table 3) it is evident that variety V
1 (Victoria) under O
5 (Vermicompost (5t/ha) +
Rhizobium (10g/kg) + PSB (10g/kg) + Humic acid (2ml/litre)) exhibits the highest net return of Rs. 176056 followed by V
1 O
6 (Victoria under Vermicompost +
Rhizobium + PSB + Sea weed extract). However, highest Benefit : Cost ratio of 2.7 was found in V
1 O
4 (Victoria under FYM +
Rhizobium + PSB + Sea weed extract) this might be due to the cheaper rate of Sea weed extract than the humic acid.