Nitrification in some tropical soils |
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Authors: | K L Sahrawat |
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Institution: | 1. The International Rice Research Institute, Los Ba?os, Philippines
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Abstract: | Summary Nitrification of soil N in 8 mineral and 2 histosols having a wide range in pH (3.4 to 8.6), organic C (1.22 to 22.70%) and
total N (0.09 to 1.20%) was studied by measuring nitrate fromation under aerobic incubation of the soil samples at 30°C for
4 weeks. The amounts of NO3-N produced in the soils varied from 0 to 123 μg/g of soil. Soil N in the two acid sulfate soils and one other acid soil did
not nitrify under conditions that stimulate nitrification. Soils having pH more than 6.0 nitrified at a rapid rate and released
NO3-N ranging from 98 to 123 μg/g. The two organic soils differed considerably in their capacity to nitrify though the total
amounts of mineral N released were similar in these soils. The amounts of NO3-N formed in the soils was highly positively correlated with the soil pH but was not significantly correlated with the organic
C of total N content of the soils. Statistical analysis also showed that nitrate formation was not significantly correlated
with soil pH in soils having pH higher than 6.0. |
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Keywords: | Acid pH Acid sulfate Aerobic incubation Alkaline soils Histosols Nitrate formation Rice soils Soil pH and nitrification |
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