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Nitrogen-uptake by plants following soil incubation
Titel:
Nitrogen-uptake by plants following soil incubation
Auteur:
Isfan, D. Zizka, J.
Verschenen in:
Communications in soil science and plant analysis
Paginering:
Jaargang 14 (1983) nr. 6 pagina's 451-462
Jaar:
1983-06
Inhoud:
Many methods of evaluating organic soil nitrogen (N) mineralization and N availability indexes have been proposed. Chemical methods are more rapid but they do not measure the soil microorganisms and plant root activities. Incubation-leaching procedure may remove some of the readily mineralizable soil organic N compounds. Continuous-incubation procedure may sometimes increase soil acidity or cause toxins accumulation. The objective of this study was to determine, in a greenhouse experiment, the relative capabilities of 10 soils with organic matter (O.M.) content ranging from 2.38 to 8.63% to supply plant-available N by combining two procedures, i.e., soil incubation and plant N-uptake. In method one (M1), N-uptake by 3 successive oat crops of 8 weeks each, without soil preincubation was studied. Method two (M2) involved a soil preincubation of 8 weeks, and the subsequent determination of N-uptake by two successive crops of oats (Avena sativa L.) of 8 weeks each. No soil-leaching was used. The results show that there was a large difference in plant N-uptake according to soil organic matter. The highest correlation between soil O.M. and plant N-uptake (r = 0.91**) was given by the first crop following incubation. The N-uptake by the first crop in M1 (without soil incubation) was much less correlated with soil O.M. (r = 0.74*) and was significantly influenced by soil initial NO3 and NH4-N. The results of this study show that the preincubation of soil samples minimized the influence of soil initial mineral N and that a preincubation was necessary before the plant N-uptake measurement, even on a 8-week cropped soil period.
Uitgever:
Taylor & Francis
Bronbestand:
Elektronische Wetenschappelijke Tijdschriften
Details van artikel 126 van 183 gevonden artikelen
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