The use of hand-held chlorophyll meters as a tool to assess the nitrogen status and to guide nitrogen fertilization of potato crop

2004 ◽  
Vol 47 (1-2) ◽  
pp. 35-80 ◽  
Author(s):  
G. Gianquinto ◽  
J. P. Goffart ◽  
M. Olivier ◽  
G. Guarda ◽  
M. Colauzzi ◽  
...  
Keyword(s):  
Nitrogen Fertilization ◽  
Potato Crop ◽  
Nitrogen Status

scholarly journals SPAD index in the diagnosis of nitrogen status in cauliflower as a function of nitrogen fertilization

Científica ◽  
2018 ◽  
Vol 46 (3) ◽  
pp. 307
Author(s):  
Sanzio Mollica Vidigal ◽  
Iza Paula De Carvalho Lopes ◽  
Mário Puiatti ◽  
Marcelo Resende de Freitas Ribeiro ◽  
Maria Aparecida Nogueira Sediyama
Keyword(s):  
Nitrogen Fertilization ◽  
Nitrogen Status

scholarly journals Leaf area index of potato (Solanum tuberosum L.) crop under three nitrogen fertilization treatments

2017 ◽  
Vol 35 (2) ◽  
pp. 171-175 ◽  
Author(s):  
Pedro Manuel Villa ◽  
Lina Sarmiento ◽  
Fermín José Rada ◽  
Daniel Machado ◽  
Alice Cristina Rodrigues
Keyword(s):  
Leaf Area Index ◽  
Leaf Area ◽  
Nitrogen Fertilization ◽  
Growth Parameters ◽  
Solanum Tuberosum L ◽  
Potato Crop ◽  
Block Design ◽  
Growth And Yield ◽  
Phenological Stages ◽  
Area Index

Nitrogen fertilization has considerable effects on growth and yield of potato crop. Leaf expansion is one of the most important growth parameters that can be used to optimize nitrogen fertilization management in agroecological practices. We evaluated the effect of nitrogen fertilization on the leaf area index (LAI) of potato crop during different phenological stages by two different methods. Experimental plots were established in a randomized block design with the following treatments: no nitrogen supply (0-N), 133 kg N ha-1 (133-N), and 400 kg N ha-1 (400-N), using the Granola variety, at the Andes region, Merida city, Venezuela. We measured leaf area at the main phenological stages of the crop using a plant canopy analyzer. LAI showed significant differences among treatments and phenological stages, except during the emergence stage. The maximum LAI values were obtained 55 days after emergence: 400-N (1.42±0.16) > 133-N (0.92±0.21) > 0-N (0.34±0.08). Nitrogen fertilization had a significant effect on the development of LAI in potato crop along its different phenological stages.

scholarly journals Efficiency of split nitrogen fertilization with adjusted irrigation on potato

2002 ◽  
Vol 11 (1) ◽  
pp. 59-74 ◽  
Author(s):  
P. KUISMA
Keyword(s):  
Single Dose ◽  
Soil Nitrogen ◽  
Nitrogen Fertilization ◽  
Potato Crop ◽  
Nitrogen Sources ◽  
Organic Soil ◽  
Potato Research ◽  
Split Application ◽  
Fertilizer Nitrogen ◽  
Yield Quality

The split application of fertilizer nitrogen and adjusted irrigation were studied at Potato Research Institute in Lammi in 1993-1995. Independent of year, variety or irrigation, the split application of nitrogen had no benefit on yield or yield quality compared to a single dose at planting on the levels of recommended nitrogen fertilization. The highest yields were received with the highest dose 110 kg ha-1 N, given all at planting, followed by 80, 50+30+30, 50+30 and 50 kg ha-1 N. The yields without fertilizer nitrogen averaged 24.8 t ha-1. The adjusted irrigation increased tuber yields 17%. The utilization of fertilizer and organic soil nitrogen was good on potato crop if water supply was taken care of. Some values of apparent fertilizer nitrogen recovery exceeded 1.0 thus suggesting that the moderate fertilization improved the ability of potato crop to utilize the natural nitrogen sources in soils.

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