Impact of the predecessors on the phytosanitary status and the productivity of wintering oats (Avena sativa L.) in the organic farming
Dina Atanasova • Vasilina Maneva • Milen Chanev
Institute of Agriculture - Karnobat, Karnobat, Bulgaria
Резюме
The Certified Organic Field was conducted an experience with wintering oat
variety Kehlibar, sown after chickpeas, lentils, potatoes and pumpkins. The aim of
the experiment was to assess the influence of the predecessors on the productivity
and phytosanitary status of wintering oats in organic farming. For organic wintering
oats, the best predecessor was a lentils (366 kg.da-1), followed by chickpeas (345
kg.da-1). The yield was high and the level of weed infestation was relatively low.
The lowest yield and the highest level of weed infestation were after the predecessors
potatoes (295 kg.da-1) and pumpkins (261 kg.da-1). During the study period, there
was no tendency for the predecessor to influence the disease attack. At the highest
density, the pests of the three ranks were seen after predecessors of chickpeas and
lentils. The greatest differences in the attack after the predecessors were observed in the order of Hemiptera. Predecessors do not affect the species composition of the
pests, but mainly their density.