Jaakkola, Antti and Yli-Halla, Markku (2008) Thirty years of growing cereal without P and K fertilization. In: NJF Report, Nordic Association of Agricultural Scientists, 4 (2), pp. 17-19.
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Summary
Over thirty years a significant depletion of P and K in soil occured when the were not given in fertilizers. This caused a reduction in crop yield. An abundant P application exceeding the crop uptake very clearly prevented the yield reduction but did not raise the extractable P concentration in the soil. Severe K deficiency did not start to appear until 20 years of growing cereal without fertilizer K. K application compensating for the uptake by the crop did not prevent the decrease of its extractable concentration in this soil, but this decrease did not affect crop yield.
EPrint Type: | Conference paper, poster, etc. |
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Type of presentation: | Paper |
Keywords: | fertilization, potassium, phosphorus, cereals |
Subjects: | Soil > Nutrient turnover |
Research affiliation: | Finland > Univ. Helsinki |
Related Links: | http://www.njf.nu |
Deposited By: | Koistinen, Riitta |
ID Code: | 15806 |
Deposited On: | 11 Jun 2009 |
Last Modified: | 12 Apr 2010 07:39 |
Document Language: | English |
Status: | Published |
Refereed: | Not peer-reviewed |
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