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Thirty years of growing cereal without P and K fertilization

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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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.
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
Refereed:Not peer-reviewed

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