EFFECTS OF <i>p</i>H AND NITRIFIER POPULATION ON NITRIFICATION OF BAND-APPLIED AND HOMOGENEOUSLY MIXED UREA NITROGEN IN SOILS

Pang, P. C.; Cho, C. M.; Hedlin, R. A.

doi:10.4141/cjss75-003

Cited by 26 publications

(8 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It is postulated that the high concentration of urea at one point in the soil resulted in slow nitrification (Mughogho et al, 1986;Pang et al, 1975) and thus high concentrations of NH 4 in the soil. Even though the fertilizer had been incorporated to a depth of 6-8 cm, volatile N losses were possible through the very sandy soils.…”

Section: ~Sn Recoverymentioning

confidence: 99%

“…Although these losses may be reduced somewhat by fertilizer incorporation, this practice only partially succeeds in lighttextured soils (Terman et al, 1968), especially when fertilizer is concentrated in a band (Overrein and Moe, 1967) or point placed as a supergranule (Buresh, 1987). When high urea concentrations occur in a band or at a single point, nitrification is slow and large amounts of ammonia are left in a high-pH zone (Pang et al, 1975). These are conditions very conducive to ammonia volatilization.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Fate and efficiency of N fertilizers applied to pearl millet in Niger

et al. 1990

View full text Add to dashboard Cite

Field studies were conducted in Niger using 15N-labeled fertilizers to assess the fate and efficiency of fertilizer N in pearl millet (Pennisetum glaucum [L.] R.Br.) production. Total plant uptake of fertilizer N was low in all cases (20%-37%), and losses were severe (25%-53%). The majority of N remaining in the soil was found in the 0-to 15-cm layer though some enrichment at lower depths was found when the N fertilizer was calcium ammonium nitrate (CAN). In a comparison of urea placement methods (band, broadcast, or point placement), no significant differences in lSN uptake or yield were noted though point placement did exacerbate 15N loss. The mechanism of N loss is believed to have been ammonia volatilization. Yields were similar whether urea or CAN was used, but 15N uptake from CAN was higher. A statistical model was developed relating millet yield and N response to midseason rainfall. In drought years, no N response was found, whereas in years of good rainfall a response was found of 15 kg grain for each kilogram of N applied (at 30 kg N ha -~ rate).

show abstract

Section: ~Sn Recoverymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Fate and efficiency of N fertilizers applied to pearl millet in Niger

et al. 1990

View full text Add to dashboard Cite

show abstract

“…However, the nitrification of NH/-N to NO 3 '-N is usually severely restricted in acid soils (23,31). In the present study, the low rates of nitrification in acid soils may have prevented the chloride ion from decreasing take-all severity.…”

Section: Discussionmentioning

confidence: 62%

Effect of ammonium chloride, ammonium sulphate and sodium nitrate on take‐all and grain yield of wheat in southwestern Australia

Brennan¹

1992

Journal of Plant Nutrition

View full text Add to dashboard Cite

Five field experiments measured the effect of three sources of nitrogen (N) fertilizer, applied at 45 kg N/ha, on the incidence of take-all and grain yield of wheat. The N fertilizers were ammonium sulphate, ammonium chloride and sodium nitrate. Compared with the nil N treatment, ammonium nitrogen fertilizer, either as ammonium sulphate (ASdr) or ammonium chloride (ACdr) drilled with the seed, lowered the severity of take-all. Sodium nitrate topdressed (SNtd) to the soil surface reduced the severity of take-all in three of the five experiments, while ammonium sulphate topdressed (AStd) reduced the severity in four experiments. Ammonium sulphate and ammonium chloride drilled with the seed were equally effective in reducing the severity of take-all in three of the five experiments. However, ACdr was more effective than ASdr in reducing the severity of take-all in one experiment, whereas ASdr was more effective than ACdr in another experiment. In experiments 1 and 5, the reduction in take-all severity between the ASdr and ACdr treatments did not affect grain yield.

show abstract

“…Many of these techniques have involved onedimensional sampling of soil layers at increasing distances from the area of nutrient application (Stumpe et al, 1984;Pang et al, 1975). Two-dimensional sampling on a large scale has been conducted to study transformations of nitrogen in urea supergranules (Savant et al, 1982) and phosphorus applied in drip irrigation (summarized by Mikkelsen, 1989).…”

Section: Introductionmentioning

confidence: 99%

A procedure for sampling the soil microenvironment at the site of fertilizer application

Christianson

Baethgen

1994

Communications in Soil Science and Plant Analysis

View full text Add to dashboard Cite

A procedure was developed to sample and analyze levels of ammonium and urea as well as pH in the soil within the immediate zone of a single urea fertilizer granule. The method involved sectioning a 2 x 3.6 cm slice of soil (0.9 cm thick) into 45 subsamples, which were analyzed individually. After analysis, the data were presented in graphical format to show the nutrient concentrations in the zone. The method was relatively easy to carry out using equipment that could be easily constructed. The precision of the procedure was high as indicated by the low variability between replicates.

show abstract

EFFECTS OF pH AND NITRIFIER POPULATION ON NITRIFICATION OF BAND-APPLIED AND HOMOGENEOUSLY MIXED UREA NITROGEN IN SOILS

Cited by 26 publications

References 2 publications

Fate and efficiency of N fertilizers applied to pearl millet in Niger

Fate and efficiency of N fertilizers applied to pearl millet in Niger

Effect of ammonium chloride, ammonium sulphate and sodium nitrate on take‐all and grain yield of wheat in southwestern Australia

A procedure for sampling the soil microenvironment at the site of fertilizer application

Contact Info

Product

Resources

About