Effect of Nitrogen Fertilizer and Zinc Sulfate on Quantitative and Qualitative Yield of Forage Maize under Deficit Irrigation Stress

Subject Areas : Journal of Crop Ecophysiology

Abdollah Gholami ¹ , Abbas Maleki ^{2 *} , Mohammad Mirzaeiheydari ³ , Farzad Babaei ⁴

1 - Ph.D. Student, Faculty of Agronomy, Ilam Branch, Islamic Azad University, Ilam, Iran
2 - Associate Professor, Department of Agronomy, Faculty of Agriculture, Ilam Branch, Islamic Azad University, Ilam, Iran
3 - Associate Professor, Department of Production Engineering and Plant Genetics, Isfahan (Khorasgan) Branch, Islamic Azad University, Isfahan, Iran
4 - Assistant Professor, Department of Agronomy, Faculty of Agriculture, Ilam Branch, Islamic Azad University, Ilam, Iran

Received: 2022-01-09 Accepted : 2022-07-17 Published : 2022-09-07

Keywords: Deficit irrigation, Ash, Protein, Forage yield, Micronutrients,

Abstract :

In order to investigate the effect of nitrogen and zinc sulfate fertilizers on the quantitative and qualitative yield of forage maize under low irrigation stress, this experiment was conducted as a split-factorial randomized complete block design with 4 replications in Ilam province during the two crop years of 2019 and 2020 was implemented. Three levels of irrigation including full irrigation (control or 90% of field capacity), irrigation based on 75% of field capacity (25% soil moisture discharge) and irrigation based on 50% of field capacity (50% soil moisture discharge) in the main plots Done. Factorial wetting of three levels of nitrogen from urea source, including zero (control), 150 and 300 kg ha-1 urea fertilizer; and foliar application of zinc sulfate at 3 levels of 0, 2 and 4 per thousand as the second factor in random was randomized. The results of combined analysis of variance showed that the interaction of year deficit irrigation stress×foliar application of zinc sulfate and the interaction of year deficit irrigation stress×nitrogen on total fresh yield were significant. The interaction of year deficit irrigation stress, year. Nitrogen fertilizer, year and foliar application of zinc sulfate, low irrigation stress×foliar application of zinc sulfate and the interaction of low irrigation stress×nitrogen fertilizer on the concentration of digestible dry matter were significant. Wet forage yield in full irrigation and consumption of 150 kg urea per hectare was 77728 kg.ha-1. Wet forage yield was obtained in complete irrigation treatment and consumption of 4 per thousand zinc sulfate in the amount of 78163 kg.ha-1. At irrigation levels based on the presence of 75% and 50% of field capacity, consumption of 4 per thousand zinc sulfate increased this index, so that in the mentioned treatments wet yield was obtained at 67460 and 49855 kg.ha-1, respectively. Irrigation treatment based on 50% of field capacity, application of 300 kg of urea fertilizer and 2 per thousand zinc sulfate resulted in grain protein content of 8.6%. Due to the lack of significant differences between treatments 2 and 4 per thousand zinc sulfate in different levels of nitrogen fertilizer, so the use of 300 kg of urea fertilizer per hectare and 2 per thousand zinc sulfate has good performance and economic justification and as the superior compound was selected to counteract the harmful effects of dehydration.

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