Dry matter accumulation and nitrogen use efficiency response of rice cultivars to nitrogen management
Journal Title: Journal of Biodiversity and Environmental Sciences (JBES) - Year 2014, Vol 4, Issue 3
Abstract
Irrigated rice in Iran involves global rice production and global nitrogen (N) consumption. The low agronomic N use efficiency (kg grain yield increase per kg N applied) of this system is below. So the objective of this study was to determine the possibility to improve the N use efficiency of irrigated rice in Iran by comparing the farmers’ Nfertilizer contents usage. Field experiments were conducted three rice cultivars (Hashemi, Kazemi, Khazar) in a completely randomized block design with 3 replications were used to study the effects of nitrogen fertilizer on nitrogen use efficiency, yield and characteristics of nitrogen uptake during two years (2008-2009) in paddy soil in Guilan province, Iran. In this experiment, four treatments including: N1-control (no N fertilizer); N2- 30 kg ha- 1 N (at transplanting time); N3- 60 kg ha-1 N (at transplanting, and tillering times); N4- 90 kg ha-1 N were compared. Results showed that the effect of N application on yield increasing was remarkable whereas N4 created the highest yield (3662kg ha-1). Dry matter, total N uptake, physiological Nitrogen use efficiency (PNUE), apparent nitrogen recovery efficiency (ANRE) and agronomic nitrogen use efficiency (ANUE) was varied in different cultivars significantly and Khazar variety had the highest contents. Maximum dry matter and total N uptake were achieved mostly at 90 kg N ha-1, which were significantly higher than other treatments .Physiological N use efficiency (PNUE), agronomic nitrogen recovery efficiency (ANRE) increased from zero nitrogen to 30kg N ha-1 significantly and the result were reversed from N2 to high content of nitrogen application (90 kg N ha-1).
Authors and Affiliations
MandanaTayefe
Keywords
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