Supaprastinto žemės dirbimo įtaka kukurūzų agrocenozei

• Main Author: Baršauskas, Dovydas
• Other Authors: Romaneckas, Kęstutis
• Format: Article in Journal/Newspaper
• Language: Lithuanian; English
• Published: 2016
• Subjects: Subarctic
• Online Access: http://asu.lvb.lt/ASU:ELABAPDB29581423&prefLang=en_US

The long-term stationary field experiment was carried out at the Experimental Station of the Aleksandras Stulginskis University (ASU) in 2012. Soil of field experiment was silty loam Luvisol (Calc(ar)i-Epihypogleyic Luvisol, LVg-p-w-cc(sc)). Climate of experimental site is subarctic, transitional maritime-continental. Average annual temperature is 6.2° C. The aim of the experiment was to establish the influence of reduced primary (in autumn) soil tillage on maize productivity. The plots of experiments were: 1. conventionally (23-25 cm) ploughed by mouldboard plough; 2. shallowly (12-15 cm) ploughed by mouldboard plough; 3. deeply (23-25 cm) tilled by chisel cultivator; 4. shallowly (12-15 cm) tilled by disc harrow; 5. no-till The most types of weed were found in the soil that was hoed shallowly (107,5 units/m-2), and the least types of weed were found in the soil that was hoed deeply (62,0 units./m-2). In the fields that were cultivated normally and shallowly – 78,8 and 85,0 or more than in the fields that were hoed deeply but less than in the fields that wee hoed shallowly. Perennial weed was found in the soil that was hoed shallowly and uncultivated. There was 13 times more weed of that kind, compared to the soil that was cultivated normally. Essential differences were found between repetitions. The mass of the short-lived weed was essentially the biggest in the soil that was hoed shallowly and uncultivated (144,7* g m-2 and 195,6** g m-2). The mass of weed in the fields that were cultivated normally was the least, only 41,2 g m-2. In the fields that were cultivated shallowly and hoed deeply, the mass of weed was almost twice bigger than in the case of an ordinary cultivating. It was observed, that, as the intensity of the main working of the soil decreased, the mass of perennial weed gradually increased, and it peaked in the fields that were hoed shallowly and uncultivated.