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.
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|
|Deposited By:||Koistinen, Riitta|
|Deposited On:||11 Jun 2009|
|Last Modified:||12 Apr 2010 07:39|
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