Improving maize nitrogen nutrition index prediction using leaf fluorescence sensor combined with environmental and management variables

2021 ◽  
Vol 269 ◽  
pp. 108180
Author(s):  
Rui Dong ◽  
Yuxin Miao ◽  
Xinbing Wang ◽  
Zhichao Chen ◽  
Fei Yuan
Keyword(s):  
Nitrogen Nutrition ◽  
Fluorescence Sensor ◽  
Nitrogen Nutrition Index

scholarly journals Soil Monitoring Methods to Assess Immediately Available Soil N for Fertigated Sweet Pepper

Agronomy ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 2000
Author(s):  
Alejandra Rodríguez ◽  
M. Teresa Peña-Fleitas ◽  
Francisco M. Padilla ◽  
Marisa Gallardo ◽  
Rodney B. Thompson
Keyword(s):  
Soil Solution ◽  
Nitrogen Nutrition ◽  
Sweet Pepper ◽  
Vegetable Production ◽  
Soil N ◽  
Monitoring Methods ◽  
N Application ◽  
Nitrogen Nutrition Index ◽  
Greenhouse Vegetable ◽  
Combined Data

Excessive N application occurs in greenhouse vegetable production. Monitoring methods of immediately available soil N are required. [NO3−] in soil solution, sampled with ceramic cup samplers, and [NO3−] in the 1:2 soil to water (v/v) extract were evaluated. Five increasing [N], from very N deficient (N1) to very N excessive (N5) were applied throughout three fertigated pepper crops by combined fertigation/drip irrigation. The crops were grown in soil in a greenhouse. Soil solution [NO3−] was measured every 1–2 weeks, and extract [NO3−] every 4 weeks. Generally, for treatments N1 and N2, both soil solution and extract [NO3−] were continually close to zero, and increased with applied [N] for treatments N3–5. The relationships of both methods to the nitrogen nutrition index (NNI), an indicator of crop N status, were assessed. Segmented linear analysis gave R2 values of 0.68–0.70 for combined data from entire crops, for both methods. NNI was strongly related to increasing [NO3−] up to 3.1 and 0.9 mmol L−1 in soil solution and extracts, respectively. Thereafter, NNI was constant at 1.04–1.05, with increasing [NO3−]. Suggested sufficiency ranges were derived. Soil solution [NO3−] is effective to monitor immediately available soil N for sweet pepper crops in SE Spain. The extract method is promising.

Critical Nitrogen Curve and Nitrogen Nutrition Index for Potato in Eastern Canada

2001 ◽  
Vol 78 (5) ◽  
pp. 355-364 ◽  
Author(s):  
G. Bélanger ◽  
J. R. Walsh ◽  
J. E. Richards ◽  
P. H. Milburn ◽  
N. Ziadi
Keyword(s):  
Nitrogen Nutrition ◽  
Eastern Canada ◽  
Nitrogen Nutrition Index

Using simple RGB Camera to estimate Nitrogen Uptake, Nitrogen Nutrition Index (NNI) and critical Nitrogen: Spring wheat case study.

2020 ◽  
Author(s):  
Jiftah Ben-Asher
Keyword(s):  
Spring Wheat ◽  
Dry Matter ◽  
Nitrogen Nutrition ◽  
N Uptake ◽  
Maximum Yield ◽  
Digital Camera ◽  
Growth Period ◽  
Growth Cycle ◽  
Nitrogen Nutrition Index ◽  
Grain Unit

<p>The first Nc dilution curve was based on dry matter (DM) power function. This model is limited to  point of singularity near zero. Another disadvantage was that it required meaasurements of DM which is time and labor consuming. Alternatively we proposed a logistic model that starts at zero and on the abscissa assumed a linear relationship between days after emergence (DAE) and DM throughout the relevant stages of wheat growth cycle.  </p><p>The Objectives of this study were to: 1) To demonstrate the feasibility of digital camera to replace laboratory tests. 2) To Determine critical N (Nc) and Nitrogen nutrition Index(NNI) of spring wheat and 3) Use N% and dry matter yield in order to calculate N uptake by wheat. This last is expected to be a tool to calculate the required amount of nitrogen to obtain maximum yield.</p><p>Wheat experiments were conducted in greenhouse lysimeters. Varied rates of N fertilizer (equivalent to 0–180 kg ha<sup>-1</sup>) and several  cultivars varying from shortest to longest ripening growth period. Nc reduced gradually from about 6% to 2%  ( =60-20 gr/Kg) when DM increased with DAE  from 0 to 14,000 kg/ha during 80 growing days.  NNI was stable and clearly distinct between   maximal index (1.0  and minimal index (0.2) when (DAE) was about 60;   Photographs succeeded to replicate laboratory measurements and obtained a linear regression curve with a unity  slop and r<sup>2</sup>=0.93. Nitrogen.  use efficiency (NUE) ranged from 50 to 65 kg  DM/unit N and from 30 to 50 Kg grain /unit N .</p>

scholarly journals Simple Assessment of Nitrogen Nutrition Index in Summer Maize by Using Chlorophyll Meter Readings

2018 ◽  
Vol 9 ◽  
Author(s):  
Ben Zhao ◽  
Syed Tahir Ata-Ul-Karim ◽  
Zhandong Liu ◽  
Jiyang Zhang ◽  
Junfu Xiao ◽  
...  
Keyword(s):  
Nitrogen Nutrition ◽  
Summer Maize ◽  
Chlorophyll Meter ◽  
Nitrogen Nutrition Index

scholarly journals SPAD Values and Nitrogen Nutrition Index for the Evaluation of Rice Nitrogen Status

2014 ◽  
Vol 17 (1) ◽  
pp. 81-92 ◽  
Author(s):  
Hu Yang ◽  
Jingping Yang ◽  
Yamin Lv ◽  
Junjun He
Keyword(s):  
Nitrogen Nutrition ◽  
Nitrogen Status ◽  
Nitrogen Nutrition Index

scholarly journals Assessment of yield, quality and nitrogen index of Agrostietum capillaris grassland as affected by fertilizations

2020 ◽  
Vol 36 (1) ◽  
pp. 101-113
Author(s):  
Aleksandar Simic ◽  
Violeta Mandic ◽  
Savo Vuckovic ◽  
Zorica Bijelic ◽  
Rade Stanisavljevic ◽  
...  
Keyword(s):  
Crude Protein ◽  
Dry Matter ◽  
Nitrogen Nutrition ◽  
N Uptake ◽  
Forage Yield ◽  
Protein Yield ◽  
Mineral Fertilizers ◽  
Dry Matter Yield ◽  
Nitrogen Nutrition Index ◽  
Yield Quality

Managing N, P and K inputs in semi-natural meadow production systems is important for achieving maximum yields in livestock farming. The objective of the present study was to estimate the effect of different NPK levels (N0P0K0, N50P50K50, N100P50K50, N100P100K100, N150P100K100 and N200P150K150 kg ha-1 yr-1) on the yield, quality and nitrogen nutrition index (NNI) in a grassland community of Agrostietum capillaris (semi-natural meadow) in western Serbia. The study was conducted during the seasons of 2005-2008. The values of the investigated parameters, except for the unit N uptake, were the highest in 2004/2005 due to favorable climate conditions. The levels of nitrogen significantly increased all of the studied parameters compared to the control treatment, except for unit N uptake. Mineral fertilizers at N200P150K150 provided the highest green forage yield (25.12 t ha-1), dry matter yield (8.12 t ha-1), crude protein yield (876.3 kg ha-1), nitrogen uptake (140.2 kg ha-1) and nitrogen nutrition index (70.2%), and the lowest unit N uptake (0.0022 kg N kg DMY-1). The use of mineral fertilizers increased green forage yield, dry matter yield and crude protein yield, increasing fertilizer from lowest to highest rate increased fresh and dry matter yield, as well as protein yield. Based on the results of the study, monitoring of nutrition indices would be necessary in order to increase productivity and economic benefits.

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