Hasan Neisi; Mohammad Rafieiolhossaini; Mahmoud Reza Tadayon; Sayed Reza Ahmadpour; Akbar Karimi
Abstract
Nitrogen is the most important nutritional element required by the rice plant, and a large part of it is lost in paddy fields through leaching, which can lead to environmental problems and reduce the efficiency of urea fertilizer use in rice cultivation. Therefore, the present experiment was conducted ...
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Nitrogen is the most important nutritional element required by the rice plant, and a large part of it is lost in paddy fields through leaching, which can lead to environmental problems and reduce the efficiency of urea fertilizer use in rice cultivation. Therefore, the present experiment was conducted with the aim of investigating the effect of using different organic and chemical nitrogen fertilizers in order to reduce or solve this problem in 2021, in a split plot experiment based on a randomized complete blocks design with three replications was implemented.The main factor including humic acid, fulvic acid and application of nitrogen fertilizer (granular urea, sulfur coated urea, ammonium sulfate, urea and ammonium nitrate, combination of sulfur coated urea and granular urea, and control) were considered as secondary factors. Comparison of the average of simple effects showed that the highest yield of paddy was obtained with the application of humic acid, which increased by 19% compared to the control. The highest plant height and biological yield were obtained by applying sulfur coated urea or sulfur coated urea with granulated urea. The highest dry weight of the cluster per plant, a single plant dry weight and the number of fertile tillers in plant belonged to the application of sulfur coated urea or the co-application of sulfur coated urea with granular urea with humic acid application. Therefore the fertigation of humic acid can be useful in improving the growth of rice in rice-cultivated soils in Khuzestan.