Growth and Chemical Composition of Rice as Affected by Nitrogen Sources and Rates of Zinc

Document Type : Research Paper

Authors

1 Member of scientific staff of Hormozgan Agricultural Research Center (Currently a Ph D. student in Soils, Tarbiat Modarres University)

2 Professor in Soils Department, School of Agriculture, shiraz University, respectively.

Abstract

Nitrogen use efficiency (NUE) is usually lower in paddy rice (Oryza sativa L.) than upland crops. This is due to nitrogen leaching, denitrification and volatilization. Attempts have been made to increase NUE through the use of different nitrogen (N) carriers, rice cultivars and nitrification and urease inhibitors. Moreover, zinc deficiency is the most important nutrient deficiencies in waterlogged calcareous soils, which causes yield reduction. This greenhouse experiment was conducted to study the effect of four nitrogen sources [urea (U), sulfur-coated urea (SCU), ammonium sulfate (AS) and ammonium chloride (AC) at a nitrogen rate of 200 mg N.kg-1soil] and three Zn rates (0, 5 and 10 mg.kg-1 soil as zinc sulphate). The experiment was factorially arranged in a randomized complete block design with three replications. Application of 20 mg Zn kg-1 soil increased rice growth significantly. The highest top dry weight was obtained with SCU and was  followed by AS, AC and U. The highest increase in N concentration was obtained with AS in comparison with other sources. Application of Zn increased N and Zn concentration and uptake. Nitrogen sources and Zn rates had no significant effect on chlorophyll content. Application of 5 mg Zn kg-1 soil, however, increased leaf area significantly.

Keywords


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