A comparison of the isotope recovery and difference methods for determining nitrogen fertilizer efficiency

1988 ◽  
Vol 105 (1) ◽  
pp. 55-67 ◽  
Author(s):  
K. Harmsen ◽  
J. T. Moraghan
Keyword(s):  
Nitrogen Fertilizer ◽  
Fertilizer Efficiency ◽  
Difference Methods

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.

scholarly journals Improving nitrogen fertilizer efficiency with the addition of compost extracts to kailan (Brassica oleracea L.) plants with wick hydroponic cultivation

2020 ◽  
Vol 17 (2) ◽  
pp. 122
Author(s):  
Tri Fitriani ◽  
Darwin Habinsaran Pangaribuan ◽  
Ainin Niswati ◽  
Sri Yusnaini
Keyword(s):  
Nitrogen Fertilizer ◽  
N Uptake ◽  
Maximum Growth ◽  
Nitrogen Fertilizers ◽  
Fertilizer Efficiency ◽  
Root Weight ◽  
Plant Weight ◽  
The Impact ◽  
Leaf Greenness ◽  
Compost Extract

<p>The goal of this research was to observe the impact of the application of the forms of compost extract and urea fertilizer on the development of kailan plants in the hydroponic wick method. The experiment consisted of a quasi- experimental factorial design with the first element reflecting the compost type: no compost extract, cow manure compost extract, rice straw compost extract, and vermicompost extract. The second element was the use of 0, 100 and 200 kg ha<sup>-1</sup> nitrogen fertilizers. The usage of vermicompost extract shows the maximum growth (59.27 cm), amount of leaves (23.00), overall plant weight (93.92 g plant<sup>-1</sup>), canopy weight (61.37 g plant<sup>-1</sup>), dried foliage weight (7.17 g plant<sup>-1</sup>), fresh root weight (33.40 g plant<sup>-1</sup>), leaf greenness (183.80 SPAD) and nutrient uptake (6.32 g plant<sup>-1</sup>). (6.32 g plant<sup>-1</sup>). The optimal nitrogen fertilizer application was found to be 200 kg ha<sup>-1</sup>, which culminated in the maximum plant height (42.18 cm), number of leaves (17.75), overall plant weight (60.42 g plant<sup>-1</sup>), leaf greenness (166.23 SPAD) and N uptake (3.73 g plant<sup>-1</sup>). With the addition of 100 kg of urea ha<sup>-1</sup>, Vermicompost extract achieved the maximum N adhesion strength of 112.05 per cent. The use of vermicompost extract in the production of crops with a hydroponic wick method could fulfill the nutrient requirements of plants.</p>

scholarly journals Pyraclostrobin effect for nitrogen fertilizer efficiency on maize

2019 ◽  
Vol 6 (4) ◽  
pp. 1857-1860
Author(s):  
Setyono Yudho Tyasmoro ◽  
Karuniawan Puji Wicaksono ◽  
Paramyta Nila Permanasari ◽  
Akbar Saitama ◽  
Akbar Hidayatullah Zaini
Keyword(s):  
Nitrogen Fertilizer ◽  
Fertilizer Efficiency

scholarly journals Efficiency of nitrogen fertilizer applied at corn sowing in contrasting growing seasons in Paraguay

2013 ◽  
Vol 37 (6) ◽  
pp. 1641-1650 ◽  
Author(s):  
Telmo Jorge Carneiro Amado ◽  
Enrique Oswin Hahn Villalba ◽  
Rafael Pivotto Bortolotto ◽  
Antônio Luis Santi ◽  
Enrique Asterio Benítez León ◽  
...  
Keyword(s):  
Nitrogen Fertilizer ◽  
Weather Conditions ◽  
N Fertilizer ◽  
Fertilizer Efficiency ◽  
Corn Yield ◽  
Fertilizer Rate ◽  
Growing Seasons ◽  
Use Efficiency ◽  
Fertilizer Rates ◽  
N Fertilizer Rate

In order to select soil management practices that increase the nitrogen-use efficiency (NUE) in agro-ecosystems, the different indices of agronomic fertilizer efficiency must be evaluated under varied weather conditions. This study assessed the NUE indices in no-till corn in southern Paraguay. Nitrogen fertilizer rates from 0 to 180 kg ha-1 were applied in a single application at corn sowing and the crop response investigated in two growing seasons (2010 and 2011). The experimental design was a randomized block with three replications. Based on the data of grain yield, dry matter, and N uptake, the following fertilizer indices were assessed: agronomic N-use efficiency (ANE), apparent N recovery efficiency (NRE), N physiological efficiency (NPE), partial factor productivity (PFP), and partial nutrient balance (PNB). The weather conditions varied largely during the experimental period; the rainfall distribution was favorable for crop growth in the first season and unfavorable in the second. The PFP and ANE indices, as expected, decreased with increasing N fertilizer rates. A general analysis of the N fertilizer indices in the first season showed that the maximum rate (180 kg ha-1) obtained the highest corn yield and also optimized the efficiency of NPE, NRE and ANE. In the second season, under water stress, the most efficient N fertilizer rate (60 kg ha-1) was three times lower than in the first season, indicating a strong influence of weather conditions on NUE. Considering that weather instability is typical for southern Paraguay, anticipated full N fertilization at corn sowing is not recommended due the temporal variability of the optimum N fertilizer rate needed to achieve high ANE.

scholarly journals High-Yielding and Heavy Manuring Rice Cultivation in Jiangsu Province, China, in Relation to the Amount of Nitrogen Fertilizer Applied and Nitrogen Fertilizer Efficiency

2012 ◽  
Vol 81 (4) ◽  
pp. 453-455 ◽  
Author(s):  
Akira Miyazaki ◽  
Toshiaki Kokubo ◽  
Jing Ju ◽  
Zujian Zhang ◽  
Buhong Zhao ◽  
...  
Keyword(s):  
Nitrogen Fertilizer ◽  
Jiangsu Province ◽  
Rice Cultivation ◽  
Fertilizer Efficiency
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