Die Bodenkultur - Journal for Land Management, Food and Environment
A. EDELBAUER and J. STANGL:
Nutrient removal of the Waldviertler Graumohn (Papaver Somniferum L.) during vegetation period
During the vegatation periof 1988 dry matter production, nutrient content and nutrient removal of grey poppy "Waldviertler Graumohn" were determined at six different stages in a field trial on brown soil at the "Waldviertel" region of Lower Austria.
At the time of seed maturity 3864 kg shoot dry matter were accumulated. The proportion of leaves amounts to 17.5 %, stalkes to 41 %, capsules to 14.8 % and seeds to 26.7 % which results in a harvest index of 0.27.
Dependent on the growth state of the poppy plant, the nutrient content of the vegetative organs varies considerably. The variations of the macronutrient contents are more distinct than for micronutrients. Contrary to this, the mineral content of the seeds remains almost unchanged during the vegetation period and the removal of nutrients occurs relatively constant too. Greater differences were observed from the third to the fourth harvest date.
The nutrient removals of the shootmass considering a plant density of 270,000/ha amounts to 71.4 kg nitrogen, 26.6 kg phosphorus, 92.7 kg potassium, 81.7 kg calcium and 15.3 kg magnesium. The share of seed is: 38.5 kg nitrogen, 15.0 kg phosphorus, 8.0 kg potassium, 14.6 kg calcium and 4.0 kg magnesium. The correspondend figures for the micronutrients are 347 g manganese, 35 g copper, 205 g zinc and 113 g boron, respectively 101 g manganese, 18.7 g copper, 92.8 g zinc and 23.4 g boron.
Key-words: poppy, nutrient removal.