Tiesioginės sėjos ir supaprastinto žemės dirbimo poveikis žieminių rapsų pasėliui

Abstract

ranged from 1.47 to 1.78 cm. The minimum height of the apical bud was set in the shallow plowing and shallow hoeing (1.47 cm) fields, that is 0.24 cm less than in the normal plowing fields (1.71 cm). The maximum height of the apical bud was set in the fourth sowing no-till soil fields (1.78 cm). Major differences between the options were not identified. The study showed that under the direct sowing in no-till soil fields the emergence and the density of winter rape crop substantially decreased during the vegetation period. Meanwhile, deep and shallow loosening affected only during winter rape germination stage. Winter rapeseed crop yields ranged from 1.16 t ha-1 to 1.75 t ha -1. Substantially lower yields (1.3 times) was set to no-till seeding soil fields (1.16 t ha-1) compared to conventional plowing fields (1.53 t ha-1). In other option‘s fields yield non-essential differences were set. When assessing crop yields, it should be taken into account that during plants growing period there were poor meteorological conditions. The investigations were carried out over the period of 2015–2016 at the experimental station of the Aleksandras Stulginskis University. The soil of the experimental site was (Calc(ar)i-Endohypogleyic Luvisol). The aim of the experiment was to set of varying intensity cultivation of rape (Brassica napus) winter varieties ׳CULT ׳ preparation for winter indicators, crop density and yield. The longest rape roots developed in direct seeding no-till soil fields. Changing the conventional ploughing shallow plowing, deep loosening and shallow loosening winter rape roots were shorter (SP – 0,17 cm, DL – 0,41 cm, SL – 0,07 cm) however, no substantial differences between the options were identified. Assessing the diameter of root collar, the smallest diameter of the root collar was identified to the winter rape grown in the conventional plowing fields (0.30 cm). After changing it to shallow loosening or No-till drilling, root collar‘s diameter set was substantially higher. The biggest number of plant‘s formed leaves was found in normal plowing fields (5.4 pc.). However, substantial differences between the options were not identified. While analyzing the rape apical bud‘s height, it was observed that it