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Pioneering the Future

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Optimal timing for foliar nutrition in soybean

Pod initiation was found to be most appropriate stage for application of Multi-K

 

 

Crop/cultivar

Soybeans / A-4100 ; A-4501 ; Dorado 4.8. ; Dekalb 458

Country / location North cent. Argentina / Junin ; Murphy ; Arequito ; Va. Dafonte
Objectives Increase yields
Haifa product tested Multi-K
Application method Foliar nutition
Tested treatment 1x 3% or 1x 6% or 3x 6% Multi-K at 200 lit./ha, combined with insecticides (against a caterpillar eating the stem base) at three different physiological stages: flower initiation, pod initiation & beginning of bean filling
Locations:
 Control treatment results
Kg/ha

Junin

2328

Murphy

4438

Arequito

4517

Va. Dafonte

4517

Best treatment results Kg/ha

2735

5030

5030

2579

Characteristics of best treatment

Best timing in all locations was spraying the Multi-K at pod initiation. In ¾ of the cases 6% produced best results. In one location 3% Multi-K was even better. The result obtained in Murphy is statistically very significant (P<0.01), and the mean of all locations is significant (P<0.05). Mean yield increase: 0.4 MT/ha Grower’s revenue from yield: 155.- US$/MT Cost of treatment (material only ): 6 $/Ha

Net benefit of best treatment 0.4 x 155 –6 = $ 56
Benefit/Cost ratio 62 / 6 = 10.3
Conclusions

This experiment is additional to several previous positive results showing considerable beneficial value for the soybean grower. Therefore, the results of this experiment can be implemented for all tractor- spraying at volumes of 100-200 L/ha. This experiment should be followed by an experiment with 20-40 L/ha (rates used in aerial sprays), and 9-12% Multi-K.

Reference G. Farbman and R. Melgar / Almidar & Haifa Chemicals Argentina, and National Institute for Agriculture