Document Type : Research Paper

Authors

1 PhD student, Departmant of Agronomy and Plant Breeding, Faculty of Agriculture, Lorestan University. Khoramabad, Iran.

2 Assistant Professor, Departmant of Agronomy and Plant Breeding, Faculty of Agriculture, Lorestan University. Khoramabad, Iran.

3 Assistant Professor, Department of Production Engineering and Plant Genetics, Faculty of Agriculture, Lorestan University, Khorramabad, Iran.

4 Associate Professor, Department of Biology, Faculty of Science, University of Isfahan, Isfahan, Iran.

Abstract

Objective: To investigate the potential for increasing the yield and quality of sweet sorghum (Sorghum bicolor (L.) Moench) by utilizing nanochelates in low irrigation conditions.
Method: This experiment was conducted using split plots with three repetitions over two years, 2016-2017 and 2017-2018. The irrigation regime was compared at two levels: 90% (normal irrigation) and 50% (deficient irrigation) of the field capacity in the main plots. Additionally, foliar spraying of Khazra iron nano chelate fertilizer was applied at five levels of 0, 2, 4, 6 and 8 per thousand in the secondary plots. At the end, the characteristics of leaf relative water content, photosynthesis and transpiration rate, mesophyll conductance, the amount of photosynthetic pigments chlorophyll a and b, carotenoids, biological yield, seed yield and harvest index were evaluated. Photosynthesis rate, transpiration rate and mesophyll conductance were measured using a photosynthesizer (model CI-304 made in America) during the flowering stage on the youngest fully opened leaf between 10 am and 2 pm. Chlorophyll a, b and carotenoid levels were measured through randomly sampling mature leaves and extracting them using acetone.
Results: The interaction between irrigation and iron nano-fertilizer (INF) had a significant impact on transpiration rate, mesophilic conductance, chlorophyll b, carotenoid content, and grain yield at a 1% significance level, and on biological yield at a 5% significance level. The application of iron nano chelate helped alleviate the negative effects of water deficit on grain yield traits, biological performance, chlorophyll b and carotenoid pigments, transpiration rate and mesophilic conductance. The combined effects of irrigation and fertilizer on mesophilic conductivity showed that there was no significant difference between irrigation regimes at 50% and 90% of field capacity for any levels of iron fertilizer except at the 4 per thousand level. Similarly, when comparing  the interactive effects of water and fertilizer on transpiration rate and chlorophyll b characteristics of the plant, similar results were observed with mesophilic guidance. The use of 4 parts per thousand iron nano-fertilizer increased biological yield under 50% field capacity irrigation compared to the same irrigation without iron nano-fertilizer. Furthermore, grain yield in the 50% field capacity irrigation was 17% higher with iron nano-fertilizer application compared to without it.
Conclusions: The foliar application of nano-chelated iron fertilizer, combined with irrigation at 50% of field capacity and a concentration of 4 per thousand of this fertilizer, is considered the most effective treatment for sweet sorghum in regions with deficiently irrigated conditions.

Keywords

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