Replacing nitrogen fertilizer with nitrogen-fixing cyanobacteria reduced nitrogen leaching in red soil paddy fields

The use of water-saving irrigation techniques has been encouraged in rice fields in response to irrigation water scarcity. Straw return is an important means of straw reuse. However, the environmental impact of this technology, e.g., nitrogen leaching loss, must be further explored. A two-year (2017–2018) experiment was conducted to investigate the vertical migration and leaching of nitrogen in paddy fields under water-saving and straw return conditions. Treatments included traditional flood irrigation (FI) and two water-saving irrigation regimes: rain-catching and controlled irrigation (RC-CI) and drought planting with straw mulching (DP-SM). RC-CI and DP-SM both significantly decreased the irrigation input compared with FI. RC-CI increased the rice yield by 8.23%~12.26%, while DP-SM decreased it by 8.98%~15.24% compared with FI. NH4+-N was the main form of the nitrogen leaching loss in percolation water, occupying 49.06%~50.97% of TN leaching losses. The NH4+-N and TN concentration showed a decreasing trend from top to bottom in soil water of 0~54 cm depth, while the concentration of NO3−-N presented the opposite behavior. The TN and NH4+-N concentrations in percolation water of RC-CI during most of the rice growth stage were the highest among treatments in both years, and DP-SM showed a trend of decreasing TN and NH4+-N concentrations. The NO3−-N concentrations in percolation water showed a regular pattern of DP-SM > RC-CI > FI during most of the rice growth stage. RC-CI and DP-SM remarkably reduced the amount of N leaching losses compared to FI as a result of the significant decrease of percolation water volumes. The tillering and jointing-booting stages were the two critical periods of N leaching (accounted for 74.85%~86.26% of N leaching losses). Great promotion potential of RC-CI and DP-SM exists in the lower reaches of the Yangtze River, China, and DP-SM needs to be further optimized.

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Ecophysiology of drill-seeded rice under reduced nitrogen fertilizer and reduced irrigation during El Niño in Central Colombia

Plant Production Science ◽

10.1080/1343943x.2021.1881407 ◽

2021 ◽

pp. 1-15

Author(s):

Vivek Deshmukh ◽

Akihiko Kamoshita ◽

Lorena Lopez-Galvis ◽

Dario Pineda

Keyword(s):

Nitrogen Fertilizer ◽

El Niño ◽

El Nino ◽

Reduced Nitrogen

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Effects of nitrogen fertilizer and water management practices on nitrogen leaching from a typical open field used for vegetable planting in northern China

Agricultural Water Management ◽

10.1016/j.agwat.2018.12.015 ◽

2019 ◽

Vol 213 ◽

pp. 913-921 ◽

Cited By ~ 7

Author(s):

Dongyan Wang ◽

Liping Guo ◽

Lei Zheng ◽

Yigong Zhang ◽

Rongquan Yang ◽

...

Keyword(s):

Water Management ◽

Open Field ◽

Nitrogen Fertilizer ◽

Management Practices ◽

Northern China ◽

Nitrogen Leaching

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Use of Genetically Improved Nitrogen-Fixing Cyanobacteria in Rice Paddy Fields: Prospects as a Source Material for Engineering Herbicide Sensitivity and Resistance in Plants

Botanica Acta ◽

10.1111/j.1438-8677.1998.tb00693.x ◽

1998 ◽

Vol 111 (3) ◽

pp. 176-190 ◽

Cited By ~ 12

Author(s):

A. Vaishampayan ◽

R. P. Sinha ◽

D.-P. Häder

Keyword(s):

Rice Paddy ◽

Source Material ◽

Paddy Fields ◽

Nitrogen Fixing ◽

Genetically Improved ◽

Rice Paddy Fields

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Nitrogen Fertilizer Recommender for Paddy Fields

Communications in Computer and Information Science - Soft Computing in Data Science ◽

10.1007/978-981-10-7242-0_20 ◽

2017 ◽

pp. 230-240 ◽

Cited By ~ 2

Author(s):

Mohamad Soffi Abd Razak ◽

Shuzlina Abdul-Rahman ◽

Sofianita Mutalib ◽

Zalilah Abd Aziz

Keyword(s):

Nitrogen Fertilizer ◽

Paddy Fields

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Rice production with minimal irrigation and no nitrogen fertilizer by intensive use of treated municipal wastewater

Water Science & Technology ◽

10.2166/wst.2014.250 ◽

2014 ◽

Vol 70 (3) ◽

pp. 510-516 ◽

Cited By ~ 6

Author(s):

Ayumi Muramatsu ◽

Toru Watanabe ◽

Atsushi Sasaki ◽

Hiroaki Ito ◽

Akihiko Kajihara

Keyword(s):

Nitrogen Fertilizer ◽

Municipal Wastewater ◽

Irrigation System ◽

Nitrogen Supply ◽

Rice Production ◽

Paddy Fields ◽

Treated Wastewater ◽

Cultivation System ◽

Treated Municipal Wastewater ◽

New System

We designed a new cultivation system of rice with circulated irrigation to remove nitrogen from treated municipal wastewater effectively and assessed the possibility of nitrogen removal in the new system without any adverse effects on rice production through bench-scale experiments through two seasons. Overgrowth of the rice plant, which can lead to lodging and tasteless rice, was found in the first season probably because nitrogen supply based on standard practice in normal paddy fields was too much in the closed irrigation system. In the second season, therefore, the amount of treated wastewater initially applied to the system was reduced but this resulted in a considerably decreased yield. On the other hand, the taste of the rice was significantly improved. The two-season experiments revealed that the new system enabled rice production with minimal irrigation (approximately 50% on the yield base compared to normal paddy fields) and no nitrogen fertilizer. The system also achieved >95% removal of nitrogen from the treated wastewater used for circulated irrigation. The accumulation of harmful metals in the rice was not observed after one season of cultivation in the new system. The accumulation after cultivation using the same soil repeatedly for a longer time should be examined by further studies.

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