The effect of simultaneous management of nitrogen fertilizer and time and duration of mid-drainage on rice cultivation and drainage water quality

Document Type : Research Paper

Authors

1 Water Eng. Department, Faculty of Agricultural Sciences, University of Guilan, Rasht, Iran

2 Water Engineering Department- Faculty of Agricultural Sciences-University of Guilan- Rasht- Iran

Abstract

This research was carried out to determine the simultaneous optimal management of nitrogen (N) fertilizer and the time and duration of mid-season drainage (MSD) of rice from an environmental point of view. This experiment was conducted in three treatments: application of N fertilizer and then drainage 7 days later for 7 days (T1), drainage for 7 days and then application of N fertilizer (T2), and drainage for 10 days and then application of N fertilizer (T3). The control treatment included fertilization at the same time as T1 treatment and without mid-season drainage.The quality parameters of drain water were measured. The results indicated that the time of applying fertilizer and drainage has a direct effect on pH. The average EC during the growth period in T2 and T3 decreased by 46 and 73%, respectively, compared to T1. The trend of NH4+ changes was upward before MSD, but after MSD, it decreased by 23% in T1 and 54% on average in T2 and T3. The average concentration of NO3- in the end season in T1, T2, and T3 was 22, 36, and 69% lower, respectively, and PO43- was 29, 31, and 67% lower than in MSD. The statistical analysis showed that the effect of time and treatments on SAR, and Cl- was insignificant. Applying fertilizer after drainage for 10 days has lower negative impact on environment. Compating yield and component yield in treatments show that T2 (7 days mid drainage and then appling nitrogen fertilizer) is a more appropriate option.

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Iranian Journal of Soil and Water Research

Articles in Press, Accepted Manuscript
Available Online from 17 April 2024

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