scholarly journals Effect of urea modified hydroxyapatite nano fertilizer on nitrogen release pattern in red soil

2021 ◽  
Vol 17 (2) ◽  
pp. 271-275
Author(s):  
C.M. Rashmi ◽  
S.S. Prakash
Keyword(s):  
Similar Pattern ◽  
Sampling Interval ◽  
Red Soil ◽  
Nitrogen Release ◽  
College Of Agriculture ◽  
Laboratory Incubation ◽  
Nitrate N ◽  
Incubation Study ◽  
N Release ◽  
Absolute Control

A laboratory incubation study was conducted during 2018 at College of Agriculture V.C. Farm, Mandya using CRD design with eight treatments and three replication. Treatments included were T1:100% Nitrogen-Urea (NU), T2 to T4: NU: UHA @ 75:25, 50:50 and 25:75 per cent, respectively and T5 to T7: UHA @ 50, 75 and 100%, respectively, T8: Absolute control. Results revealed that application of 100 per cent N through nano UHA increased the content of ammonical-N at 5 DAI (653.3 μg g-1) but the content decreased at 10 DAI (583.3 μg g-1) and increased to 716.7 μg g-1 at 15 DAI and maintained it upto 20 DAI while, it decreased at 45 DAI. The nitrate –N release was highest (596.7 μg g-1) at 10 DAI in T7 treatment and maintained it upto 20 DAI and decreased at 45 DAI. Similar pattern was observed with the application of 75 and 50 per cent N-UHA treatments (T6 and T5, respectively). The amount of release of ammonical and nitrate N was proportional to the amount N added through UHA at any sampling interval.

Modelling N mineralization from green manure and farmyard manure from a laboratory incubation study

2011 ◽  
Vol 222 (3) ◽  
pp. 719-726 ◽  
Author(s):  
M. Mohanty ◽  
K. Sammi Reddy ◽  
M.E. Probert ◽  
R.C. Dalal ◽  
A. Subba Rao ◽  
...  
Keyword(s):  
Green Manure ◽  
N Mineralization ◽  
Farmyard Manure ◽  
Laboratory Incubation ◽  
Incubation Study

scholarly journals Soil Application of Zeolite Affects Inorganic Nitrogen, Water Soluble and Exchangeable Potassium

2021 ◽  
pp. 267-273
Author(s):  
Ch. Ravali ◽  
K. Jeevan Rao ◽  
T. Anjaiah ◽  
K. Suresh
Keyword(s):  
Nitrate Nitrogen ◽  
Inorganic Nitrogen ◽  
Water Soluble ◽  
Ammoniacal Nitrogen ◽  
Exchangeable Potassium ◽  
College Of Agriculture ◽  
Leaching Losses ◽  
Soil Application ◽  
Incubation Study ◽  
Clinoptilolite Zeolite

An incubation study was conducted at college of agriculture, rajendranagar, PJTSAU to evaluate the influence of zeolite application on inorganic nitrogen, water soluble and exchangeable potassium in soil. Clinoptilolite Zeolite was fully mixed with soil (7.5 t ha-1) at the start of the experiment. Nitrogen was applied to soil through urea (200 kg ha-l). The experiment was conducted for 35 days and soil was analyzed for inorganic nitrogen, water soluble and exchangeable potassium at weekly intervals i.e., 1, 7, 14, 21, 28, 35 days of incubation. The results indicated that the treatment with zeolite application showed significantly higher ammoniacal nitrogen from day 1 (136.54 mg kg-l) to day 35 (38.71 mg kg-l) as well as nitrate nitrogen (day 1 – 59.13 mg kg-l; day 35 – 130.13 mg kg-l). Similarly water soluble (day 1 – 92.21 kg ha-l; day 35 – 103.13 kg ha-l) and exchangeable potassium (day 1 – 363.69 kg ha-l; day 35 – 393.94 kg ha-l) was also significantly higher in zeolite applied treatments. Thus, mixing of zeolite into soil improves inorganic nitrogen through reducing leaching losses and also improves water soluble and exchangeable potassium.

scholarly journals Nitrogen Release Properties of Controlled-release Fertilizers during Tomato Production

HortScience ◽  
2014 ◽  
Vol 49 (12) ◽  
pp. 1568-1574 ◽  
Author(s):  
Luther C. Carson ◽  
Monica Ozores-Hampton ◽  
Kelly T. Morgan ◽  
Jerry B. Sartain
Keyword(s):  
Controlled Release ◽  
Nonlinear Regression ◽  
Nutrient Release ◽  
Nitrogen Release ◽  
Data Logger ◽  
Tomato Crop ◽  
Tomato Production ◽  
N Release ◽  
Soil Temperatures ◽  
Controlled Release Fertilizers

Determination of nutrient release duration from controlled-release fertilizers (CRFs) or soluble fertilizers encapsulated in polymer, resin, or sulfur covered fertilizer coated with a polymer differs among manufacturers, but may be determined as 75% to 80% nitrogen (N) release at a constant temperature (e.g., 20 to 25 °C). Increases or decreases in temperature compared with the manufacturer release determination temperature increase or decrease CRF N release; thus, coated fertilizer may release more rapidly than stated during the fall season when soil temperatures in seepage-irrigated tomato (Solanum lycopersicum) production can reach 40.1 °C. The objectives of this study were to evaluate N release duration of CRFs by measuring N release from CRFs incubated in pouches under polyethylene mulch-covered raised beds and to determine the CRF duration suitable for incorporation into a fall tomato fertility program. In 2011 and 2013, 12 and 14 CRFs from Agrium Advanced Technologies, Everris, Florikan, and Chisso-Asahi Fertilizer were sealed in fiberglass mesh pouches (12.7 × 14 cm) that were buried 10 cm below the bed surface in a tomato crop grown using commercial production practices. A data logger collected soil temperature 10 cm below the bed surface. Pouches were collected and N content was measured eight times through two fall seasons. A nonlinear regression model was fit to the data to determine N release rate. During the 2011 and 2013 seasons, minimum, average, and maximum soil temperatures were 21.2 and 19.2, 25.7 and 23.5, and 32.2 and 27.7 °C, respectively. Seasonal total CRF N release was between 77.6% and 93.8% during 2011 and 58.3% and 94.3% in 2013. In 2011, PCU90 and in 2013, PCU90 and PCNPK120 had the highest seasonal total percentage N release (PNR) and FL180 had the lowest in both years. A nonlinear regression fit N release from CRF with R2 = 0.85 to 0.99 during 2011 and 0.49 to 0.99 during 2013. Nitrogen release from all CRFs was faster than the manufacturer’s stated release, probably as a result of high fall bed temperatures. A CRF or CRF mixture containing CRFs of 120- to 180-day release duration may be recommended, but the CRFs must release greater than 75% N during the season.

scholarly journals Phosphorus rather than nitrogen enhances CO2 emissions in tropical forest soils: Evidence from a laboratory incubation study

2020 ◽  
Vol 71 (3) ◽  
pp. 495-510 ◽  
Author(s):  
Dafeng Hui ◽  
Wesley Porter ◽  
Jana R. Phillips ◽  
Marcos P.M. Aidar ◽  
Steven J. Lebreux ◽  
...  
Keyword(s):  
Tropical Forest ◽  
Co2 Emissions ◽  
Forest Soils ◽  
Laboratory Incubation ◽  
Incubation Study
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