Nitrogen Availability in an Organic Potato Crop Following 3-Year Transition under Contrasting Farming Systems

Liu, K.; Hammermeister, Andrew M.; Entz, Martin H.; Astatkie, Tess; Warman, P. R.

doi:10.1080/10440046.2010.519194

Cited by 3 publications

(2 citation statements)

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“…The instant N availability after transition was 47 kg N ha (1 estimated by the KCl N method, whereas across all cropping systems, average soil N availability was 123 kg N ha (1 using the ryegrass N bioassay, and 394 kg N ha (1 using the laboratory incubation method. The ryegrass N uptake appeared to be the most reasonable estimate of available N when considering the average N uptake (103 kg N ha (1 ) of the succeeding potato crop on these soils (Liu et al 2010). This difference of 20 kg N ha (1 is reasonable when considering the N losses that occur through the winter and the higher N use efficiency of ryegrass compared with potato.…”

Section: Ryegrass N Bioassaymentioning

confidence: 88%

“…Carpenter-Boggs et al (2000) reported that crop rotations differing in crop components could have large effects on both mineralizable N pools and N availability by altering the quantity and quality of residue input. Incorporated legume residues could induce an increase in microbial activity (Lupwayi et al 2004) by enlarging the pools of C and N, making more N available. Nitrogen fixation by clovers ranged from 40 to 120 kg ha (1 on a local long-term functioning organic farm in Atlantic Canada (Patriquin et al 1986).…”

Section: Soil Potentially Mineralizable Nmentioning

confidence: 99%

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Assessing soil nitrogen availability in contrasting cropping systems at the end of transition to organic production

et al. 2011

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Liu, K., Hammermeister, A. M., Warman, P. R., Drury, C. F. and Martin, R. C. 2011. Assessing soil nitrogen availability in contrasting cropping systems at the end of transition to organic production. Can. J. Soil Sci. 91: 493–501. Quantifying soil nitrogen (N) availability at the end of a transition period for converting conventional fields to organic fields could enhance N management during the subsequent organic crop production phase. Soil total N (Ntot), KCl extractable N (KCl N) and potentially mineralizable N (No) were determined at the end of a 3-yr transition period. A complementary greenhouse ryegrass N bioassay was conducted using soils collected from the treated field plots. The field experiment consisted of six cropping systems comprising two N inputs (legume-based vs. manure-based) and three forage cropping treatments (0, 1 or 2 yr of forage in 4-yr rotations). The N input treatments consisted of alfalfa meal in the legume-based cropping system (LBCS) and composted beef manure in the manure-based cropping system (MBCS). Orthogonal contrasts suggested no differences in Ntot or KCl N either between LBCS and MBCS or between no-forage and forage cropping systems. However, in the greenhouse study, high cumulative N inputs in the MBCS resulted in significantly higher ryegrass N uptake and potentially mineralizable soil N than in the LBCS. Ryegrass N uptake ranged from 101 to 139 kg ha−1, which should be an adequate N supply for the succeeding potato crop. In the greenhouse, a ryegrass N bioassay effectively identified the differences in soil N availability. Ryegrass N uptake was linearly related to cumulative soil amendment N inputs but had no apparent relationship with N o. A systems approach provided a good assessment of N availability at the end of the transition period to organic production.

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Section: Ryegrass N Bioassaymentioning

confidence: 88%

Section: Soil Potentially Mineralizable Nmentioning

confidence: 99%