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Effects of Several Biostimulants on Emergence and Yield of Two Snap Bean Cultivars, 2001

Jim E. Wyatt

Department of Plant Sciences and Landscape Systems

Interpretative Summary

Except for the first day of emergence, no differences were found between cultivars in plant stands and biostimulant treatments had no effect on seedling emergence. >Hystyle exhibited more seedling damage in the form of Abald heads@ than >Romano 942= but biostimulant treatments had no effect on plant damage. Beans treated with Focus 15G had the highest yields in the study with both >Romano 942= and >Hystyle= cultivars and this biostimulant merits further investigation as a material to enhance snap bean yield.

Objectives

The objective of this study was evaluate liquid formulations of two biostimulants as seed- or soil-applied treatments and one granular formulation of a soil-applied biostimulant to determine effectiveness of the materials on stimulating growth and yield of snap beans.

Materials and Methods

The study was at the West Tennessee Experiment Station, Jackson, TN. Prior to planting, 200 lbs/acre of 15-15-15 fertilizer and 4 qts/acre of Diazinon were broadcast and incorporated into the plots. The experiment was arranged as a split-plot with four reps and snap bean cultivars as main plots and biostimulant treatments as sub-plots.
Two snap bean cultivars, >Romano 942= and >Hystyle=, were used in the study. Biostimulant treatments were 1) Focus seed treatment @ 7.9 fl. ozs. of product/100 lbs. of seed; 2) Focus in-furrow spray @ 0.1837 fl. oz. of product/100 ft. of row; 3) Launch seed treatment @ 34.9 fl. ozs. of product/100 lbs. of seed; 4) Launch in-furrow spray @ 0.8080 fl. oz. of product/100 ft. of row; 5) Focus 15G in-furrow @ 1.598 oz. of product/100 ft. of row; and 6) untreated control.
Data collected included seedling emergence, percent Abald heads@, pod yield. The two center rows of each plot were harvested for yield with a one-row Pull Pix snap bean harvester.
>Hystyle= was harvested on 14 June and >Romano 942= was harvested on 19 June. Yield data were converted to lbs/acre and analyzed using the SAS statistical program and mean separation was by LSD.

Results and Discussion

Fastest emergence by 27 Apr was by >Romano 942= (Table 1). This difference was not observed three days later or on 4 May. The number of damaged seedlings was significantly higher in the >Hystyle= cultivar but biostimulant treatment had no effect on seedling emergence. There were no interactions between cultivars and biostimulant treatments.
As expected, >Romano 942= produced significantly higher yields than >Hystyle= (Table 2) since it was harvested 5 days later and has larger individual pods than >Hystyle=
Treatment with Focus 15G had the highest yield in the study, and produced 500 to 1000 pounds more pods than other biostimulant treatments and about 700 pounds more than the untreated control. It is recommended that Focus 15G be investigated further as a yield enhancing material for snap beans and possibly other vegetables.

Table 1. Seedling emergence on three days and number of seedlings without a growing point in biostimulant study on ‘Romano 942' and ‘Hystyle’ snap beans at the West Tennessee Experiment Station, Jackson, TN


Treatment

Application method

Ratez

Emergence (no/20 ft row) Bald heads Apr 27 Apr 30 May 4 (No.)

Cultivar

 

 

 

 

 

 

Romano 942

----

----

14.4ax

56.9a

67.0a

3.0b

Hystyle

----

----

5.6b

60.4a

69.1a

10.5a

LSD 5%

 

 

3.1

Ns

ns

2.9

Biostimulant

 

 

 

 

 

 

Focus

Seed

7.9

8.3a

56.1a

66.8a

6.6a

Focus

In-furrow

0.1837

9.7a

55.0a

67.3a

7.9a

Launch

Seed

34.9

8.8a

56.7a

69.2a

8.4a

Launch

In-furrow

0.808

10.8a

62.7a

70.3a

6.3a

Focus 15G

In-furrow

1.598

12.7a

62.5a

70.14a

5.1a

Untreated control

-----

-----

9.9a

58.7a

64.7a

7.1a

LSD 5%

 

 

ns

ns

ns

ns

Interaction
Cultivar x Biostimulant

 

 

ns

ns

ns

ns

zFluid ounces per 100 lbs of seed or ounces of product per 100 row feet.
Xmeans for treatment variables within columns followed by the same letter are not significantly different, LSD 5%.

Table 2. Yield of ‘Romano 942' and ‘Hystyle’ snap beans with several biostimulant treatments at the West Tennessee Experiment Station, Jackson, TN


Treatment

Application method

Ratez

Yield (lbs/acre)

Cultivar

 

 

 

Romano 942

----

----

5768ax

Hystyle

----

----

3136b

LSD 5%

 

 

623

Biostimulant

 

 

 

Focus

Seed

7.9

4016b

Focus

In-furrow

0.1837

4541ab

Launch

Seed

34.9

4334ab

Launch

In-furrow

0.806

4516ab

Focus 15G

In-furrow

1.598

5023a

Untreated control

-----

-----

4284ab

LSD 5%

 

 

835

Interaction
Cultivar x Biostimulant

 

 

ns

zFluid ounces per 100 lbs of seed or ounces of product per 100 row feet.
Xmeans for treatment variables within columns followed by the same letter are not significantly different, LSD 5%.
 

Copyright © 1999 by The University of Tennessee. All rights reserved.

This research represents one season's data and does not constitute recommendations.  After sufficient data is collected over the appropriate number of seasons, final recommendations will be made through research and extension publications.

 

 

 

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