scholarly journals Recovery of 15N Labeled Nitrogen Fertilizer by Fertigated and Drip Irrigated Greenhouse Vegetable Crops

Agronomy ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 741 ◽  
Author(s):  
Carolina Martínez-Gaitán ◽  
María Rosa Granados ◽  
María Dolores Fernández ◽  
Marisa Gallardo ◽  
Rodney B. Thompson
Keyword(s):  
Vegetative Growth ◽  
Irrigation Management ◽  
Fertilizer Application ◽  
Sweet Pepper ◽  
Fruit Production ◽  
N Fertilizer ◽  
Soil Parameters ◽  
Vegetable Crops ◽  
Mineral N ◽  
Conventional Management

The stable isotope 15N was used to assess the recovery of mineral N fertilizer applied to fertigated and drip-irrigated spring muskmelon and autumn-winter sweet pepper crops grown in greenhouse soil plots. They received 92–96% of mineral N fertilizer as NO3−. 15N-labeled Ca (NO3)2 fertilizer was applied to crops during vegetative growth and fruit production phases. Crops were grown with either conventional management or combined improved N and irrigation management. Improved management for both irrigation and N was based on the combined use of models, to estimate crop requirements, and of monitoring of soil parameters. In sweet pepper, from conventional management, 15N recoveries from the 15N applications made during vegetative growth and fruit production were 66% and 58%, respectively. With improved management in sweet pepper, the corresponding 15N recoveries were 82% and 77%. In muskmelon, 15N recoveries from conventional management from the 15N applications made during vegetative growth and fruit production were 71% and 42%, respectively. With improved management, the corresponding 15N recoveries were 68% and 44%, respectively. The results demonstrated that combined drip irrigation and fertigation systems with frequent irrigation and N fertilizer application can have very high recovery of applied N fertilizer, of 77–82%.

scholarly journals Growth and Yield Responses of Cowpea and Groundnut to Five Rhizobial Inoculant Strains in the Guinea Savanna Zone of Ghana

2020 ◽  
Vol 2020 ◽  
pp. 1-8
Author(s):  
F. Mintah ◽  
Y. Z. Mohammed ◽  
S. Lamptey ◽  
B. D. K. Ahiabor
Keyword(s):  
Block Design ◽  
Dry Weight ◽  
Fertilizer Application ◽  
N Fertilizer ◽  
Growth And Yield ◽  
Mineral N ◽  
Guinea Savanna ◽  
Rhizobial Inoculation ◽  
Yield Responses ◽  
Savanna Zone

Inoculating groundnut and cowpea with highly effective and competitive rhizobial strain improves nodulation. A field experiment was carried out at the experimental field of the Faculty of Agriculture, University for Development Studies, Nyankpala, to evaluate the growth and yield responses of cowpea and groundnut to five rhizobial inoculant strains in the Guinea Savanna zone. The experiment was laid out in a randomized complete block design (RCBD) with eight (8) treatments replicated four (4) times. The treatments included five rhizobial inoculant strains (NC 92, KNUST 1002, KNUST 1003, KNUST 1006, and BR 3267), two N fertilizer levels (20 kg·N/ha and 40 kg·N/ha), and a control. The results showed that rhizobial inoculation and N fertilizer application increased nodulation, biomass yield, pod number, pod weight, hundred seed weight, nodule dry weight, and pod yield of groundnut compared with the control. Rhizobial inoculation averagely increased the nodulation and yield by 63 and 67%, respectively, compared with the control. Mineral N fertilizer (20 kg N/ha) on average increased the nodulation and yield by 24 and 25%, respectively, compared with the control plots. It can be recommended from this study that, in the absence of highly competitive rhizobial strains such as KNUST 1006 and NC 92 as biofertilizers for increasing the nodulation and yield of cowpea and groundnut, 20 kg·N/ha can be used for the purpose. Further research is recommended using these rhizobial strains in combination with lower rates of N fertilizers (<20 kg·ha−1).

Impact of mineral N fertilizer application rates on N2O emissions from arable soils under winter wheat

2014 ◽  
Vol 100 (1) ◽  
pp. 111-120 ◽  
Author(s):  
Ulrike Lebender ◽  
Mehmet Senbayram ◽  
Joachim Lammel ◽  
Hermann Kuhlmann
Keyword(s):  
Winter Wheat ◽  
Fertilizer Application ◽  
N Fertilizer ◽  
N2o Emissions ◽  
Arable Soils ◽  
Mineral N ◽  
Application Rates

scholarly journals A New Local Sustainable Inorganic Material for Soilless Culture in Spain: Granulated Volcanic Rock

HortScience ◽  
2014 ◽  
Vol 49 (12) ◽  
pp. 1537-1541 ◽  
Author(s):  
Judith Pozo ◽  
Juan E. Álvaro ◽  
Isidro Morales ◽  
Josefa Requena ◽  
Tommaso La Malfa ◽  
...  
Keyword(s):  
Volcanic Rock ◽  
Sweet Pepper ◽  
Fruit Production ◽  
Pollutant Emissions ◽  
Limiting Factor ◽  
Vegetable Crops ◽  
Physical Chemical ◽  
Geological Origin ◽  
The University

Volcanic rock has been used for decades as a horticultural substrate worldwide. In Spain, the use of this material as a substrate is ancient; it was initially used in the Canary Islands because of its volcanic geological origin. At the University of Almería (Almería, Spain), three independent vegetable crops were grown under greenhouse conditions: sweet pepper, tomato, and melon. The volcanic rock came from a location in the geographic center of Spain, which facilitated logistics. Bags of volcanic rock (25 L) were used and were compared with a commercial coconut fiber substrate of an equal volume. All physical, physical–chemical, and chemical parameters of the volcanic rock were determined using European standard analytical procedures. Fertigation was applied, independently adapted to the physical, physical–chemical, and chemical characteristics of each substrate. The cultures were performed under a randomized complete block experimental design. Fertigation parameters, pollutant emissions, fruit production, and the quality of each culture were measured. The results showed that the assessed parameters of the volcanic rock substrate are not a limiting factor for its use as a horticultural substrate. The resultant production and quality were very similar among the three crops compared with a widely used commercial control. Therefore, volcanic rock emerges as a local, sustainable alternative to be used for soilless crop cultivation.

Dependence of soil mineral N on N-fertilizer application

1986 ◽  
Vol 91 (3) ◽  
pp. 417-420 ◽  
Author(s):  
J. J. Neeteson ◽  
D. J. Greenwood ◽  
E. J. M. H. Habets
Keyword(s):  
Fertilizer Application ◽  
N Fertilizer ◽  
Soil Mineral N ◽  
Soil Mineral ◽  
Mineral N

scholarly journals Supplemental Fertilizer Application in the BMP Era for Vegetable Crops Grown in Florida in the BMP Era

EDIS ◽  
1969 ◽  
Vol 2003 (4) ◽  
Author(s):  
Eric Simonne ◽  
George Hochmuth
Keyword(s):  
Production Management ◽  
Irrigation Management ◽  
Fertilizer Application ◽  
Cooperative Extension Service ◽  
Extension Service ◽  
Publication Date ◽  
Vegetable Production ◽  
Vegetable Crops ◽  
Global Approach ◽  
University Of Florida

This publication is one of a series entitled Fertilizer and Irrigation Management in the BMP Era. This series is divided into nine principles described in the Introduction Chapter (HOS-897). This publication is part of Principle 3, "Monitor Crop Nutritional Status and Discover How Healthy the Plants Are." BMP implementation requires a global approach to production management. However, for presentation purposes, each aspect of vegetable production is described in a separate publication. This document is HS906, one of a series of the Horticultural Sciences Department, Florida Cooperative Extension Service, Institute of Food and Agricultural Sciences, University of Florida. Publication date: January 2003. https://edis.ifas.ufl.edu/hs163

Nutrient management in a Pinusradiata plantation after thinning: the effect of nitrogen fertilizer on soil nitrogen fluxes and tree growth

1995 ◽  
Vol 25 (10) ◽  
pp. 1673-1683 ◽  
Author(s):  
J.C. Carlyle
Keyword(s):  
N Uptake ◽  
Fertilizer Application ◽  
N Fertilizer ◽  
Soil Mineral N ◽  
Fertilizer N ◽  
Soil Mineral ◽  
Mineral N ◽  
N Fluxes ◽  
Highly Correlated ◽  
The Relationship

The influence of N fertilizer on soil mineral N fluxes, canopy development, and tree growth was studied in a thinned 11-year-old Pinusradiata D. Don plantation. Ammonium sulphate and single superphosphate were applied in an incomplete factorial design, but only the main effects of N application at 0 (control) or 200 kg N•ha−1 are considered here. Spring application of fertilizer increased the quantity of mineral N in the forest floor plus surface soil (0–0.30 m) from 1.2 to 194 kg•ha−1. Within 51 weeks this had fallen to 8.3 kg•ha−1, and after 89 weeks had returned to prefertilizer levels. In the unfertilized soil, rates of net mineralization were low with little seasonal variation. Nitrogen fertilizer increased N mineralization; over the 2 years of measurement fertilized and unfertilized soils mineralized 155 and 77 kg N•ha−1, respectively. There was no net immobilization of fertilizer N. There was no leaching of mineral N from the unfertilized soil whereas 149 kg N•ha−1 was leached below 0.30 m during the 2 years after fertilizer application. Nitrogen uptake increased from 71 kg•ha−1 in the control to 203 kg•ha−1 in the fertilized treatment. Fifty-one percent (103 kg•ha−1) of N uptake by trees in the fertilized treatment occurred within 20 weeks of fertilizer application. Fertilized trees took up 58% of the available N (N added as fertilizer plus N mineralized), while 42% was leached. Ammonium dominated the soil mineral N pool and mineral N fluxes, with nitrate generally accounting for less than 10% of mineral N in both fertilized and unfertilized soils. Leaching of mineral N from the fertilized soil (Nleach, kg•ha−1•week−1) was highly correlated (r2 = 0.92) with soil mineral N content (Nstart, kg•ha−1) and effective rainfall (rainfall minus evaporation, Reff, mm•week−1) according to the relationship Nleach = aNstart + bReff, while N uptake (kg•ha−1•week−1) was highly correlated (r2 = 0.91) with soil mineral N content and N mineralization (Nmin, kg•ha−1•week−1) according to the relationship Nuptake = aNstart + bNmin. Fertilizer increased needle N concentrations and content by 52 and 87%, respectively, after 58 weeks, and resulted in a 17% increase in leaf area index after 71 weeks. These differences were reflected by an increase in basal area increment of 23% during the 2 years since fertilizer application. The rapid uptake of N fertilizer was associated with storage in existing biomass. Uptake of fertilizer N should, therefore, increase with plantation biomass. Consequently, it should be possible to increase the uptake of N fertilizer, and minimize leaching, by applying fertilizer before, rather than after, thinning. Such a strategy may be particularly appropriate for soils that have a low capacity to retain applied N.

A meta-analysis of sugarbeet yield responses to nitrogen fertilizer measured in England since 1980

2009 ◽  
Vol 147 (3) ◽  
pp. 287-301 ◽  
Author(s):  
K. W. JAGGARD ◽  
A. QI ◽  
M. J. ARMSTRONG
Keyword(s):  
Nitrogen Fertilizer ◽  
Meta Analysis ◽  
Peat Soil ◽  
Summer Rainfall ◽  
Sowing Date ◽  
Fertilizer Application ◽  
N Fertilizer ◽  
Fibrous Root ◽  
Mineral N ◽  
Available N

SUMMARYThe data from 161 experiments testing the response of sugarbeet yield to nitrogen fertilizer were assembled in a database. Three commonly used N response models (Mitscherlich, linear plus exponential and bilinear) were fitted to each set of fertilizer application rates and the models were then assessed on how well they fitted all the data. The bilinear model was judged the most appropriate model for fitting to beet root yield adjusted to a standard sugar concentration. The optimum N application was determined for each experiment. Attempts were then made to correlate these optima with factors associated with the site and the season (winter rainfall, soil texture, amount of soil mineral N at sowing, sowing date, summer rainfall and harvest date). Beet grown in peat soil never responded significantly to any applied N fertilizer and neither did crops treated recently with organic manure supplying large amounts (>150 kg N/ha) of available N. Variation in N optima between other sites could not be explained by factors that could be used to predict the amount of fertilizer to apply. In the absence of any method to make reliable predictions of variations in fertilizer need, the most economical uniform amount was calculated. At present fertilizer prices and beet values, this amount is between 100 and 110 kg N/ha. It is possible that the N fertilizer need of beet crops does not vary predictably because this variation is an experimental error. The crop needs a reasonably standard application of fertilizer because much N has to be taken up early in the crop's development, rapidly and predominantly from the topsoil that, at this stage, contains most of the small fibrous root system.

Sign in / Sign up

Export Citation Format

Share Document