The effect of tillage method on potato variety 'Lasunak' tuber potassium and phosphorus content in 1997...1999
2001
Laeaeniste, P. | Joudu, J. | Eremeev, V. | Lohmus, A. | Makke, A. (Estonian Agricultural Univ., Tartu (Estonia))
The trial was established with a late-maturing potato variety of Byelorussian 'Lasunak'. The following essential results were achieved from the trial. Based on the results of three trial years it was learnt that the potassium content of the tubers dry matter was rather stable and was not much influenced by the weather conditions, as potassium stays very mobile both in rainy and dry vegetation period. During the trial years the average potassium content in dry matter of the tubers was 1.8...2.0 per cent. The phosphorus content of the tubers is strongly related to the rainfall during the vegetation period and the phosphorus content in soil. The rainy vegetation period in 1998 faciliated phosphorus accumulation in tubers. The phosphorus content in dry matter of tubers of M and MC versions and S+Ti version was over 0.31 per cent. In To+Ti 0.5 versions the phosphorus content was 0.27 per cent. The results were relatively low in droughty 1999, when the movement of phosphorus from the soil to the plant and from there to the tubers was inhibited because of the moisture deficiency. The phosphorus content was bigger in C-versions (+0.06 per cent). In 1997 the average phosphorus content was 0.22 per cent
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