Improving nitrogen fertilizer efficiency in lowland rice in tropical Asia

1986 ◽  
pp. 171-186 ◽  
Author(s):  
S K De Datta
Keyword(s):  
Nitrogen Fertilizer ◽  
Lowland Rice ◽  
Fertilizer Efficiency ◽  
Tropical Asia

scholarly journals High Nitrogen Fertilization Modulates Morpho-Physiological Responses, Yield, and Water Productivity of Lowland Rice under Deficit Irrigation

Agronomy ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 1291
Author(s):  
Nasr M. Abdou ◽  
Mohamed A. Abdel-Razek ◽  
Shimaa A. Abd El-Mageed ◽  
Wael M. Semida ◽  
Ahmed A. A. Leilah ◽  
...  
Keyword(s):  
Nitrogen Fertilizer ◽  
Irrigation Water ◽  
Nitrogen Fertilization ◽  
Deficit Irrigation ◽  
Physiological Responses ◽  
Water Productivity ◽  
Water Shortage ◽  
Rice Production ◽  
Lowland Rice ◽  
Nitrogen Fertilizers

Sustainability of rice production under flooding conditions has been challenged by water shortage and food demand. Applying higher nitrogen fertilization could be a practical solution to alleviate the deleterious effects of water stress on lowland rice (Oryza sativa L.) in semi-arid conditions. For this purpose, field experiments were conducted during the summer of 2017 and 2018 seasons. These trials were conducted as split-split based on randomized complete blocks design with soil moisture regimes at three levels (120, 100 and 80% of crop evapotranspiration (ETc), nitrogen fertilizers at two levels (N1—165 and N2—200 kg N ha−1) and three lowland Egyptian rice varieties [V1 (Giza178), V2 (Giza177) and V3 (Sakha104)] using three replications. For all varieties, growth (plant height, tillers No, effective tillers no), water status ((relative water content RWC, and membrane stability index, MSI), physiological responses (chlorophyll fluorescence, Relative chlorophyll content (SPAD), and yield were significantly increased with higher addition of nitrogen fertilizer under all water regimes. Variety V1 produced the highest grain yield compared to other varieties and the increases were 38% and 15% compared with V2 and V3, respectively. Increasing nitrogen up to 200 kg N ha−1 (N2) resulted in an increase in grain and straw yields by 12.7 and 18.2%, respectively, compared with N1. The highest irrigation water productivity (IWP) was recorded under I2 (0.89 kg m−3) compared to (0.83 kg m−3) and (0.82 kg m−3) for I1 and I3, respectively. Therefore, the new applied agro-management practice (deficit irrigation and higher nitrogen fertilizer) effectively saved irrigation water input by 50–60% when compared with the traditional cultivation method (flooding system). Hence, the new proposed innovative method for rice cultivation could be a promising strategy for enhancing the sustainability of rice production under water shortage conditions.

scholarly journals Sustainable Agriculture by Increasing Nitrogen Fertilizer Efficiency Using Low-Resolution Camera Mounted on Unmanned Aerial Vehicles

2019 ◽  
Vol 16 (20) ◽  
pp. 3893 ◽  
Author(s):  
Kim ◽  
Min ◽  
Kim ◽  
Silva ◽  
Hyun ◽  
...  
Keyword(s):  
Chlorophyll Content ◽  
Nitrogen Fertilizer ◽  
Precision Agriculture ◽  
Vegetation Index ◽  
Normalized Difference Vegetation Index ◽  
Nitrogen Deficiency ◽  
Underground Water ◽  
Fertilizer Efficiency ◽  
Low Resolution ◽  
Effective Manner

Nitrogen use efficiency in modern agriculture is very low. It means that a lot of synthetic chemicals are wasted rather than utilized by crops. This can cause more problems where the soil surface is thin and rocky like Jeju Island in the Republic of Korea. This is because overly used nitrogen fertilizer can be washed into the underground water and pollute it. Thus, it would be important to monitor the nitrogen deficiency of crops in the field to provide the right amount of nitrogen in a timely manner so that nitrogen waste can be limited. To achieve this, the normalized difference vegetation index (NDVI) was used to monitor chlorophyll content, which is tightly associated with nitrogen content in the buckwheat field. The NDVI was calculated with the data obtained by a low-resolution camera mounted on an unmanned aerial vehicle. The results showed that the NDVI can estimate the chlorophyll content of buckwheat. These simple but clear results imply that precision agriculture could be achieved even with a low-resolution camera in a cost-effective manner to reduce the pollution of underground water.

Results from recent studies on nitrogen fertilizer efficiency in wetland rice

1983 ◽  
Vol 12 (3) ◽  
pp. 125-134 ◽  
Author(s):  
S. K. De Datta ◽  
I. R. P. Fillery ◽  
E. T. Craswell
Keyword(s):  
Nitrogen Fertilizer ◽  
Fertilizer Efficiency ◽  
Wetland Rice ◽  
Grain Production ◽  
Factors Affecting ◽  
Farming Practice ◽  
Mode Of Application

Yields of rice can be substantially increased by the use of nitrogenous fertilizers, but the return to the producer depends very much on the mode of application. This article reviews the factors affecting the uptake of nitrogen by wetland rice, in terms of grain production, and the means by which experimentally achieved results can be translated into everyday farming practice.

Variety-Specific Nitrogen Fertilizer Recommendation for Lowland Rice

2005 ◽  
Vol 35 (13-14) ◽  
pp. 1891-1903 ◽  
Author(s):  
M. A. Saleque ◽  
U. A. Naher ◽  
N. N. Choudhury ◽  
A. T. M. S. Hossain
Keyword(s):  
Nitrogen Fertilizer ◽  
Lowland Rice ◽  
Fertilizer Recommendation
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