[Effect of the regulated phosphate levels in different soils on the nutrient supply in oat (Avena sativa L.)]
1997
Bocheva-Neikova, Elena (Institute of Soil Science and Agroecology N. Poushkarov, Sofia (Bulgaria))
A 5x8 factorial pot experiment with oat at five different soils (Haplustolls, Calcixerolls, Vertisols, Albaqualfa, Alfisols) and 8 increasing degree of saturation of phosphate adsorption maximum, corresponding to 6, 12, 25, 50, 100, 150 and 200 per cent Pmax plus Control (without P application), was carried out. There were significant changes in the chemical composition of oat, depending not only on the soil type, but also on the increasing degree of saturation of Pmax of the soil. The P content was varied in large range from 220 to 600 mg/100g DM in the grain and from 30 to 770 mg/100g DM in the straw. There was a sharp increase in the content of P in straw in the interval 25-50 per cent Pmax for all investigated soils and at some soils P per cent reached and even exceeded the content of P in grain. Significant changes in the content of other nutrients (K, Ca, Zn, Mn, Cu) and in the ratio between them were observed. There was not a single trend of increase or decrease of the content of the nutrients and ratios as a result of P application but secondary local maxima and minima. Therefore, the use of the united optimising criteria to create regulated P levels at different soils is necessary not only in fertiliser application, but also in research work involving different soils
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