1990
DOI: 10.1007/bf02851987
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The effects of nitrate:ammonium ratios and nitrapyrin on the nitrogen response ofZea mays L. under field conditions

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Cited by 12 publications
(7 citation statements)
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“…Over all N rates the optimum N O 3 -N : N H 4 -N ratio also appeared to be between 3 : 1 and 1 : 1 (Table 3a, contrast 4; Table Table 4). Substantiation for an optimum NO3-N:NH4-N ratio close to 3:1 without a nitrification inhibitor over N rates on a similar soil type in a different climatic region was given by Adriaanse and Human (1990). A 3:1 ratio also corresponds to the results of Human (1986, 1988 a, b) at 100 mg N L-1 in a greenhouse-sand-hydroponic system.…”
Section: Grain Yieldmentioning
confidence: 99%
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“…Over all N rates the optimum N O 3 -N : N H 4 -N ratio also appeared to be between 3 : 1 and 1 : 1 (Table 3a, contrast 4; Table Table 4). Substantiation for an optimum NO3-N:NH4-N ratio close to 3:1 without a nitrification inhibitor over N rates on a similar soil type in a different climatic region was given by Adriaanse and Human (1990). A 3:1 ratio also corresponds to the results of Human (1986, 1988 a, b) at 100 mg N L-1 in a greenhouse-sand-hydroponic system.…”
Section: Grain Yieldmentioning
confidence: 99%
“…The optimum NO3-N: NH4-N ratio over two N rates, applied as nutrient solutions for field maize on a sandy soil was shown to be close to 3:1 without nitrapyrin and close to 1:3 with nitrapyrin in a low-potential grain yield area (Adriaanse and Human, 1990). The similar maize grain yield responses to CO(NH2) 2 and NH4NO3, which were both better than to KNO 3 (Jung et al, 1972) would probably have been different if a nitrification inhibitor had been added.…”
Section: Introductionmentioning
confidence: 99%
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“…According to Adriaanse & Human (1990), NH/-N contributes considerably to the residual inorganic N content of South African soils under maize production, especially when ammonium-containing fertilizer was band-placed in sandy soils that are slightly acid. As a result of this finding, Landman (1995) investigated the relationship between inorganic soil N, viz.…”
Section: Introductionmentioning
confidence: 99%
“…Nitrapyrin (2-chloro-6-(trichloromethyl) pyridine) has been shown to be the most effective chemical compound in retarding nitrification of NH4 (Adriaance and Human, 1990;Barber et al, 1992;Bremner and Krogmeier, 1989;Chancy and Kamprath, 1982;Dibb and Welch, 1976;Hoeft, 1984;Glassock et al, 1995;Pan et al, 1984;Ronaghi and Soltanpour, 1993).…”
Section: Climatementioning
confidence: 99%