ИЗСЛЕДВАНИЯ ВЪРХУ ПОЛСКИТЕ КУЛТУРИ
издание на
ДОБРУДЖАНСКИ ЗЕМЕДЕЛСКИ ИНСТИТУТ
гр. Генерал Тошево
 

търсене по автор

НАЧАЛО
Условия за публикуване
Редакционна колегия
Изисквания към авторите
Етични правила
Том XIV, 2021
Книжка 1
Книжка 2-3-4
1 статия   9 - 16
2 статия   17 - 26
3 статия   27 - 42
4 статия   43 - 56
5 статия   57 - 64
6 статия   65 - 72
7 статия   73 - 90
8 статия   91 - 98
9 статия   99 - 106
10 статия   107 - 120
11 статия   121 - 126
12 статия   127 - 136
13 статия   137 - 142
Том XIII, 2020
Том XII, 2019
Том XI, 2018
Том X, 2016
Том IX, 2014
Том VIII, 2012
Том VII, 2011
Том VI, 2010
Том V, 2009
Том IV, 2007
Том III, 2006
Том II, 2005
Том I, 2004
Публикационнен процес
Статия
 Пълна версия ORIGINAL PAPER
 
Influence of crop density on the productivity of some sunflower hybrids (Helianthus annuus L.) in the conditions of Dobrudzha
  Mariyana Stoeva1 • Petar Yankov2  

1Dobrudzha Agricultural Institute - General Toshevo, 9521, General Toshevo, Bulgaria

2Technical University - Varna, Department of Plant Production, 9010, Varna, Bulgaria

 
     Резюме
 
The study was carried out on the land of the Dobrudzha Agricultural Institute - General Toshevo in the period 2020-2021. The experiment is based on the method of fractional plots, in threefold repeatability of the variants and the size of the harvest plot of 20 m2. The tillage and weed control are carried out using the traditional technology of growing the crop for the conditions of the area. Sunflower hybrids were fertilized with 6 kg N/da and 12 kg P2O5/da. The sowing was done mechanized with a planter for precise sowing at a sowing rate of 5000, 6500 and 8000 plants per decare. The hybrids Deveda (conventional linoleic hybrid), Enigma CLP (imi-resistant hybrid), Dara (sulfo-resistant hybrid) both breeding of DZI - Gen. Toshevo and P64HE144 (high oleic hybrid) from Pioneer (Corteva Agriscience) were selected for the study. Seed yield in Deveda and P64HE144 hybrids increases with increasing crop density. The Dara hybrid has the highest productivity at 5000 plants per da. Seed yield in Enigma hybrid is relatively the same in the studied crop densities.

Key words: Sunflower, Crop density, Yield