Planting density as a factor forming the structure of a potato plant
Maria Pytlarz-Kozicka
iaipr@upwr.edu.plKatedra Szczegółowej Uprawy Roślin, Akademia Rolnicza, Wrocław (Poland)
Abstract
The aim of the investigations was to determine the effect of interrow spacing and planting density on the structure of potato plants of various earliness in the period of florescence and harvesting. A three-factor experiment was carried out using a subblock method. The investigated factors were: 1) interrow width: 62.5; 75.0; 90.0 cm; 2) planting density in a row: 30 and 40 cm; 3) varieties: very early — Orlik and midlate — Arkadia. At the florescence stage both varieties showed a tendency to increase both a number and mass of shoots, leaves, stolons and tubers with the increased row spacing to 90 cm and planting density to 40 cm in a row. A medium late variety Arkadia compared to var. Orlik was characterized by the higher number and the greater mass of shoots, leaves, roots and stolons per plant. In turn, plants of var. Orlik produced more tubers on stolons and the greater tuber mass per plant. A number of shoots per hectare was higher in var. Arkadia, and decreased with widening row spacing. Moreover, it was smaller at a lower planting density. The percentage content of dry matter and starch in tubers during flowering was low and depended on the features of the investigated varieties. At the harvest stage a wider row spacing and lower plant density resulted in the slightly greater number and mass of stems and tubers per plant. The very early variety Orlik developed both a smaller number of shoots and smaller mass of stems and tubers per plant than midlate var. Arkadia, but yielded the larger average weight of one tuber. The content of dry matter was higher in tubers produced by var. Arkadia, whereas the total protein content was higher in tubers harvested from var. Orlik plants.
Keywords:
planting density, intercrop, plant structure, potatoReferences
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Authors
Maria Pytlarz-Kozickaiaipr@upwr.edu.pl
Katedra Szczegółowej Uprawy Roślin, Akademia Rolnicza, Wrocław Poland
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