Abstract
To evaluate the effects of sulfur and iron fertilizers on yield, yield components and nutrient uptake in sesame (Sesamum indicum L.) under water stress, a field experiment was conducted as split factorial design with three replication at Dezful, Khuzestan, Iran. Two irrigation regimes were used (well-watered and water-limited) as the main plots and subplot consisted of three levels of sulfur (B1 = 0, B2 = 100 and B3 = 200 kg.ha-1) and three foliar application of iron (C1 = 0, C2 = 3 and C3 = 6*1000 concentrations). The results showed that water stress significantly reduced biological yield (10.26%) and number of capsule per plant. Interaction between water stress and combination of iron and sulfur fertilizers had significant effect on grain yield. The highest grain yield was obtained by well water treatment and b2c2fertilizers treatment. Interaction between water stress and combination of iron and sulfur fertilizers had significant effect on nitrogen and iron content in the seeds. The highest iron content of seeds was obtained at water stress treatment and b1c2, and highest nitrogen content was at b1c2 and b1c3 fertilizers treatments. Key words: Sesame, water stress, sulfur, iron, yield, nutrients content.
Highlights
Drought is known to limit plant productivity in many regions of the world
The objective of this study was to investigate the effect of iron and sulfur application on growth, yield, yield components and nutrient uptake of sesame (Sesamum indicum L.) plants grown under water stress conditions
Analysis of variance revealed a significant effect of water stress on biological yield, number of capsule per plant and harvest index in sesame (Table 2)
Summary
Drought is known to limit plant productivity in many regions of the world. The extent to which photosynthetic capability is maintained during periods of water stress and the ability of rapid recovery of photosynthesis after rewatering may play an important role in plant adaptation to drought environments. Crop production in arid and semi-arid regions is restricted by soil deficiencies in moisture and plant nutrients. High yielding crops need large and regular supply of macro and micro nutrient elements to develop high photosynthetic capacity and maintain the proper elements concentration in the leaves (Lawlor, 1995). The importance of sulfur fertilezation in increasing wheat production and other crops has been well documented, but still it is difficult to determine the quantities to apply under water stress conditions. Sulfur (S) is one of the essential macro elements of plant and is regarded as the fourth key element after N, P and K (Lewandowska and Sirko, 2008)
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