+ Resolve Article
+ Follow Us
Follow on FacebookFollow on Facebook
Follow on TwitterFollow on Twitter

+ Translate
+ Subscribe to Site Feed
GeoScience Most Shared ContentMost Shared Content

Transformations and losses of fertilizer nitrogen on no till and conventional till soils

, : Transformations and losses of fertilizer nitrogen on no till and conventional till soils. Fertilizer Research 10(2): 135-146

A field study was conducted in 1982 to measure the effect of no-till (NT) and conventional till (CT) systems on N transformation after surface and subsurface applications of N fertilizers. Urea, urea-ammonium nitrate (UAN) solution, (NH4)2SO4 (AS), and CA(NO3)2 were applied to NT and CT plots (5.95 m2) at a rate of 448 kg N ha-1. A comparison of fertilizer N recovered in soils receiving incorporated or surface applied N was used to estimate NH3 volatilization while denitrification was estimated from fertilizer N recovered in the presence and absence of nitrapyrin with incorporated N. Immobilization was assessed in microplots (0.37 m2) after surface application of (15NH4)2SO4 to NT and CT systems at a rate of 220 kg N ha-1. The results indicate litle difference between NT and CT systems on urea hydrolysis rates and immobilization of surface applied fertilizer N. Approximately 50% and 10% of the surface applied N was recovered in the inorganic and organic fractions, respectively, on both tillage systems. The N not recovered was likely lost from plot areas through soil runoff. Incorporation of UAN, urea and AS resulted in 20 to 40% greater inorganic N recovery than from surface application. Nitrification rates were greater under the NT than the CT system. The similarities in concentration in the various N pools observed between the two tillage systems may be partially due to the short length of time that NT was imposed in this field study (1 year) since other researchers using established tillage system (> 5 y) indicate that NT tends to promote decreased efficiency of feritilizer N.


Other references

Soliev, T.S.; Arifzhanov, K.R.; Nabieva, D.A.; Mirakhmedova, K.T., 2002: Haptoglobin phenotype in patients with spondyloarthritis and healthy individuals. Haptoglobin (Hp) phenotype distribution was evaluated in 95 patients with seronegative spondylarthritis and 100 normal controls. The incidence of three Hp types was virtually the same in acute patients and controls. Reactive arthritis was associat...

Hobson G.P.; Ryan P.J., 1987: Evaluation of the tolerance of lupine lupinus spp and linseed linum usitatissimum to pre emergence or post emergence herbicide applications. Tests of Agrochemicals & Cultivars (8): 88-89

Khalaf-Nazzal, R.; Francis, F., 2015: Hippocampal development - old and new findings. The hippocampus, derived from medial regions of the telencephalon, constitutes a remarkable brain structure. It is part of the limbic system, and it plays important roles in information encoding, related to short-term and long-term memory, and spa...

Hollmann A., 1975: Treatment against the wishes of relatives of attempted suicide cases. Deutsche Medizinische Wochenschrift 100(36): 1812

Geraerts, E.; McNally, R.J.; Jelicic, M.; Merckelbach, H.; Raymaekers, L., 2007: Linking thought suppression and recovered memories of childhood sexual abuse. There are two types of recovered memories: those that gradually return in recovered memory therapy and those that are spontaneously recovered outside the context of therapy. In the current study, we employed a thought suppression paradigm, with au...

Roberts, J.A., 1971: The ovarian vein and hydronephrosis of pregnancy. Experimental studies in the rhesus monkey (Macaca mulatta). Investigative Urology 8(6): 610-621

Stewart, J.G., 1977: Morphology of sorella in natural habitats and under laboratory conditions. Although thalli attributable to the genus Sorella (Delesseriaceae, Rhodophyceae) can be easily recognized, determination of species is difficult. The characters described for differentiating the type species are found to vary and overlap when nume...

Das, A.K.; Kundu, M.; Chakrabarti, P.; Basu, J., 1992: Fatty acylation of a 55 kDa membrane protein of human erythrocytes. The major palmitoylated human erythrocyte membrane protein has an M(r) of 55,000. It is distinct from the glucose transporter and is not derived from band 3 or ankyrin. It resists salt extraction suggesting a high affinity for the membrane. Pulse...

Babskow A., 1983: Determination of resistivity of a borehole using microcomputers. Studii si Cercetari de Geologie, Geofizica, Geografie Seria Geofizica

Raine, Robin, 2013: A review of the biophysical interactions relevant to the promotion of habs in stratified systems the case study of ireland. The biophysical interactions involved in the promotion of harmful algal events are reviewed with specific reference to events that have occurred around Ireland. The direct and indirect effects of tides, solar heating and winds are considered over...