NITRATE LOSSES IN DRAINED PADDY FIELDS DURING RICE AND CANOLA GROWING SEASONS

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DOUSTIPASHAKOLAEE S.; SHAHNAZARI A.; JAFARI TALUKOLAEE M.

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Journal: Journal of Water Research in Agriculture Year:2017 | Volume:31 | Issue:1 Page(s): 59-73

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Title

NITRATE LOSSES IN DRAINED PADDY FIELDS DURING RICE AND CANOLA GROWING SEASONS

Author(s)

DOUSTIPASHAKOLAEE S. | SHAHNAZARI A. | JAFARI TALUKOLAEE M. | Issue Writer Certificate

Keywords

DRAIN DEPTHQ1

DRAIN DISCHARGEQ1

DRAIN SPACINGQ1

PIEZOMETERQ1

SOIL DEPTHQ1

Abstract

Subsurface drainage is a prerequisite to growing winter crops and improving water management in rice season in the consolidated paddy ﬁelds in Northern Iran. Based on different cultivation condition, to decrease nutrient loss from subsurface drainage in these fields, adopting suitable strategies will decrease the pollution of water resources. A research was conducted in pilot farm of Sari Agricultural Sciences and Natural Resources University from May 2015 to April 2016 (during two successive rice-canola growing seasons) to evaluate the effect of subsurface drainage systems on nitrate loss and nitrate concentration in different SOIL DEPTHs. The subsurface drainage treatments were three existing subsurface drainage systems with mineral envelopes, including systems with 30-m spacing and 0.9 m depth, a drainage system with 30-m spacing and 0.65 m depth, a drainage system with 15-m spacing and 0.65 m depth, and a bi-level subsurface drainage system with DRAIN SPACING of 15 m and DRAIN DEPTHs of 0.65 and 0.9 m as alternate depths (bi-level). The nitrate concentration was monitored in drainage water and at depths of 0.4, 0.9, 2 and 5 m during the study period. The results showed that the nitrate concentration and the total nitrate loss during rice growing season was 33-80% and 91-99 %, respectively, less than that in canola growing season. Also, the nitrate concentration in drainage water for drains with 0.9 m depth was more than that in drains with 0.65 m depth. On the other hand, nitrate concentration in surface depth was higher than lower depths in all treatments. Overall, in both seasons, drainage system with wider spacing and shallower depth drained out less nitrate than the other systems.

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APA: Copy

DOUSTIPASHAKOLAEE, S., SHAHNAZARI, A., & JAFARI TALUKOLAEE, M.. (2017). NITRATE LOSSES IN DRAINED PADDY FIELDS DURING RICE AND CANOLA GROWING SEASONS. IRANIAN JOURNAL OF WATER RESEARCH IN AGRICULTURE (FORMERLY SOIL AND WATER SCIENCES), 31(1), 59-73. SID. https://sid.ir/paper/196800/en

Vancouver: Copy

DOUSTIPASHAKOLAEE S., SHAHNAZARI A., JAFARI TALUKOLAEE M.. NITRATE LOSSES IN DRAINED PADDY FIELDS DURING RICE AND CANOLA GROWING SEASONS. IRANIAN JOURNAL OF WATER RESEARCH IN AGRICULTURE (FORMERLY SOIL AND WATER SCIENCES)[Internet]. 2017;31(1):59-73. Available from: https://sid.ir/paper/196800/en

IEEE: Copy

S. DOUSTIPASHAKOLAEE, A. SHAHNAZARI, and M. JAFARI TALUKOLAEE, “NITRATE LOSSES IN DRAINED PADDY FIELDS DURING RICE AND CANOLA GROWING SEASONS,” IRANIAN JOURNAL OF WATER RESEARCH IN AGRICULTURE (FORMERLY SOIL AND WATER SCIENCES), vol. 31, no. 1, pp. 59–73, 2017, [Online]. Available: https://sid.ir/paper/196800/en

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