NITROGEN FERTILISATION OF LETTUCE, PROCESSING TOMATO AND SWEET PEPPER: YIELD, NITROGEN UPTAKE AND THE RISK OF NITRATE LEACHING

1999 ◽  
pp. 61-68 ◽  
Author(s):  
F. Tei ◽  
P. Benincasa ◽  
M. Guiducci
Keyword(s):  
Nitrogen Uptake ◽  
Nitrate Leaching ◽  
Sweet Pepper ◽  
Nitrogen Fertilisation ◽  
Processing Tomato

A computational history and outlook of nitrogen use efficiency and precipitation-optimal fertilisation timings in agriculture

2021 ◽  
Author(s):  
Daniel McKay Flecher ◽  
Siul Ruiz ◽  
Tiago Dias ◽  
Katherine Williams ◽  
Chiara Petroselli ◽  
...  
Keyword(s):  
Soil Moisture ◽  
Nitrogen Uptake ◽  
Nitrogen Use Efficiency ◽  
Nitrogen Efficiency ◽  
Nitrogen Use ◽  
Plant Nitrogen ◽  
Nitrogen Fertilisation ◽  
Plant Nitrogen Uptake ◽  
Use Efficiency ◽  
Rainfall Patterns

<p>Half of the nitrogen applied to arable-fields is lost through several processes linked to soil moisture. Low soil moisture limits nitrogen mobility reducing nitrogen-uptake while wetter conditions can increase nitrogen leaching. Rainfall ultimately governs soil moisture and the fate of nitrogen in soil. However, the interaction between rainfall and nitrogen use efficiency (NUE) remains poorly understood.</p> <p>We developed a field-scale modelling platform that describes coupled water and nitrogen transport, root growth and uptake, rainfall, the nitrogen-cycle and leaching to assess the NUE of split fertilisations with realistic rainfall patterns. The model was solved for every possible split fertilisation timing in 200+ growing seasons to determine optimal timings. Two previous field trials regarding rainfall and NUE had contrasting results: wetter years have enhanced fertiliser loss and drier years reduced plant nitrogen uptake. By choosing appropriate fertilisation timings in the model we could recreate the two contrasting trends and maintain variability in the data. However, we found by choosing other fertilisation timings we could mitigate the leaching in wetter years. Optimised timings could increase plant nitrogen uptake by up to 35% compared to the mean in dry years. Plant uptake was greatest under drier conditions due to mitigated leaching, but less likely to occur due to low nitrogen mobility. Optimal fertilisation timings varied dramatically depending on the rainfall patterns. Historic and projected rainfall patterns from 1950-2069 were used in the model. We found optimal NUE has a decrease from 2022-2040 due to increased heavy rainfall events and optimal fertilisation timings are later in the season but varied largely on a season-to-season basis.</p> <p>The results are a step towards achieving improved nitrogen efficiency in agriculture by using the ‘at the right time’ agronomic-strategy in the ‘4Rs’ of improved nitrogen fertilisation. Our results can help determine nitrogen fertilisation timings in changing climates.</p>

High fertigation frequency improves nitrogen uptake and crop performance in processing tomato grown with high nitrogen and water supply

2015 ◽  
Vol 154 ◽  
pp. 52-58 ◽  
Author(s):  
Michela Farneselli ◽  
Paolo Benincasa ◽  
Giacomo Tosti ◽  
Eric Simonne ◽  
Marcello Guiducci ◽  
...  
Keyword(s):  
Water Supply ◽  
Nitrogen Uptake ◽  
High Nitrogen ◽  
Processing Tomato ◽  
Crop Performance

Nitrogen uptake, nitrate leaching and root development in winter-grown wheat and fodder radish

2017 ◽  
Vol 33 (2) ◽  
pp. 233-242 ◽  
Author(s):  
L. J. Munkholm ◽  
E. M. Hansen ◽  
I. K. Thomsen ◽  
E. M. Wahlström ◽  
H. S. Østergaard
Keyword(s):  
Root Development ◽  
Nitrogen Uptake ◽  
Nitrate Leaching ◽  
Fodder Radish

Nitrate leaching under phalaris, cocksfoot, and annual ryegrass pastures and implications for soil acidification

1999 ◽  
Vol 50 (1) ◽  
pp. 55 ◽  
Author(s):  
A. M. Ridley ◽  
R. J. Simpson ◽  
R. E. White
Keyword(s):  
Nitrogen Uptake ◽  
Nitrate Leaching ◽  
Soil Acidification ◽  
Perennial Grasses ◽  
Annual Ryegrass ◽  
Management Option ◽  
North Eastern ◽  
Lime Application ◽  
High Concentrations ◽  
Bare Fallow

Nitrogen uptake and nitrate (NO-3) leaching below 1.1 m was estimated under phalaris, cocksfoot, and annual ryegrass pastures and under bare fallow in a 4-year field experiment under control and high N (500 kg N/ha) treatments in north-eastern Victoria (693 mm/year rainfall for the study period). The perennial grasses, particularly phalaris, took up more N in herbage than annual ryegrass. High concentrations of NO3-N were measured at 1 m depth below all treatments, suggesting that NO3- losses from pastures have potential to contaminate streams and/or groundwater. Perennial pastures were only able to reduce NO3- leaching compared with annuals in drier than average years. Values calculated for acid addition due to NO3-leaching resulted in a net annual input of approximately 1 kmol H +/ha.year under the phalaris pasture compared with 2 kmol H +/ha.year under annual ryegrass. Adding these figures to carbon cycle addition data of 1 kmol H+/ha.year (measured in a previous study) corresponds to a lime rate of 100 and 150 kg lime/ha.year being required to stop further acidification under these pasture types. A 1 unit pH decline to 30 cm depth was estimated to take 42 years under annual pasture or 67 years under perennial grasses. Whilst perennial pastures have a role in reducing soil acidification, lime application is the most important management option in balancing soil acidification caused by agriculture.

Effects of Polymer-coated Urea on Nitrate Leaching and Nitrogen Uptake by Potato

2010 ◽  
Vol 39 (2) ◽  
pp. 492-499 ◽  
Author(s):  
Melissa L. Wilson ◽  
Carl J. Rosen ◽  
John F. Moncrief
Keyword(s):  
Nitrogen Uptake ◽  
Nitrate Leaching ◽  
Coated Urea ◽  
Polymer Coated Urea
Sign in / Sign up

Export Citation Format

Share Document