Response of sunflower to organic and chemical fertilizers in different drought stress conditions

Abstract

<p>The main objectives of this research were to determine the effects of applying organic and chemical fertilizers under different irrigation regimes on sunflower (<em>Helianthus annuus</em> L.) morphological traits, yield components, grain yield and grain quality. The experiment was conducted as spilt plots based on a randomized complete block design with three replicates. Irrigation treatments at three levels (well-irrigated, mild and severe drought stress) were allocated to main plots and eight fertilizer treatments (urea (F1), urea + composted cattle manure (F2), zeocompost (F3), vermicompost (F4), zeolite-amended chicken manure (Z-ACM) (F5), zeocompost + vermicompost (F6), zeocompost + Z-ACM (F7) and vermicompost + Z-ACM (F8)) were randomized in sub-plots. The results showed that irrespective of the drought stress intensity, organic fertilizer treatments produced more dry matter, heavier and greater grain than did chemical treatments. In well-irrigated plots, the highest grain yield was obtained from F6, F7 and F8 treatments. Under drought stress conditions, the highest grain yield was obtained from the high zeolite content organic fertilizers i.e. F3, F5 and F7. We concluded that amending soil with organic fertilizers in combination with zeolite<em> </em>can be a beneficial approach for decreasing chemical fertilizer application rates and improving the sustainability of agricultural systems.</p>

Effect of Organic and Inorganic Fertilizers on Soil Properties, Growth Yield, and Physiochemical Properties of Sunflower Seeds and Oils

“…Therefore, producers have started to use organic fertilizers to improve the physical and chemical structure of soils. The use of organic fertilizers should be expanded to reduce environmental pollution and guarantee sustainable soils and reduce inorganic fertilizer use; especially as there are huge amounts of agriculture wastes produced every year in Egypt that could be effectively turned into organic fertilizer production [14]. The rated amount of agricultural wastes in Egypt ranges from 22 to 26 million dry tons per year and can cause numerous problems to rural areas in Egypt.…”

Sulfate-Based Fertilizers Regulate Nutrient Uptake, Photosynthetic Gas Exchange, and Enzymatic Antioxidants to Increase Sunflower Growth and Yield Under Drought Stress

“…However, severe arid or dry conditions drastically affect the early flowering and anthesis phase and may reduce the seed yield up to 80% (Pekcan et al 2015;Hussain et al 2016). The negative effects of drought stress on sunflower oil yield and quality are further aggravated by insufficient or imbalanced supply of mineral fertilizers (Khodaei-Joghan et al 2018). Hence, the use of optimal fertilization practices is essential to achieve sustainable oilseed productivity in dry arid regions of the world (Yousaf et al 2017).…”

Using pyrimidinecarboxylic acids as growth stimulants for Rhododendron ledebourii Pojark and Rhododendron smirnowii Trautv.

“…Over the past few years, the cultivation of plants has been facing a number of challenges, including a dramatic increase in temperatures, lack of soil water, and the need for more resistant and hardy plants, which grow even under the harshest conditions. It is therefore vital to minimise the time required for the growth of planting material, which can be done using growth and germination stimulants, including synthesised chemical compounds Pentelkina, 2003;Vasin et al, 2008Vasin et al, , 2009Ostroshenko and Ostroshenko, 2011;Schuchka, 2006;Baranova, 2013a;Khodaei-Joghan et al, 2018;Nesterkina et al, 2019) and other original modes (Shibaeva et al, 2018).…”