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Applying granulated and hydrated hydrophilic polymers at sowing to sustainseedling establishment of spring turnip rape

Published online by Cambridge University Press:  28 January 2011

H. KÄNKÄNEN ,
E. AURA ,
K. PAHKALA ,
P. PELTONEN-SAINIO  and
E. HUUSELA-VEISTOLA
H. KÄNKÄNEN*
Affiliation:
MTT Agrifood Research Finland, Plant Production, FI-31600 Jokioinen, Finland
E. AURA
Affiliation:
MTT Agrifood Research Finland, Plant Production, FI-31600 Jokioinen, Finland
K. PAHKALA
Affiliation:
MTT Agrifood Research Finland, Plant Production, FI-31600 Jokioinen, Finland
P. PELTONEN-SAINIO
Affiliation:
MTT Agrifood Research Finland, Plant Production, FI-31600 Jokioinen, Finland
E. HUUSELA-VEISTOLA
Affiliation:
MTT Agrifood Research Finland, Plant Production, FI-31600 Jokioinen, Finland
*
*To whom all correspondence should be addressed. Email:[email protected]
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Summary

Optimal temperature and soil moisture conditions for germination of spring turnip rape(Brassica rapa L. subsp. oleifera DC.) are not oftenrealized in Finland. New tools for better establishment, such as water-storing polymers,could ensure a good start for yield formation. Because technologies in field cropping mustbe cost effective and easy to carry out, the amounts of polymers applied per hectareshould be small. After recording non-significant effects of granulated polymers underfield conditions and reduced emergence under dry conditions in pots, hydratedpolyacrylamide (PAM) was placed under the seeds during drilling, a technique referred toas gel-sowing. Slightly acid PAM polymer hydrated with water was used (5–7 gPAM/kg gel). The gel was pumped directly under the seeds at application rates of1·0–3·4 kg PAM/ha. The PAM gel did not reduce the need forcareful preparation of the soil bed and accurate timing of sowing, but when theseprerequisites were fulfilled, the gel sustained early establishment and seedling growth.The gel helped when circumstances after sowing did not favour germination or earlyestablishment. However, accurate placing of PAM gel under the seeds is challenging andfurther improvements in the technique of gel-sowing could enhance its positiveeffects.

Type
Crops and Soils
Information
The Journal of Agricultural Science , Volume 149 , Issue 5 , October 2011 , pp. 567 - 577
Copyright
Copyright © Cambridge University Press 2011

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References

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