Contents of labile carbon and nitrogen under different soil management practices in a vineyard in an extremely humid year

Abstract

Received: 2016-09-06 | Accepted: 2016-10-19 | Available online: 2017-03-31

http://dx.doi.org/10.15414/afz.2017.20.01.16-19

In a productive vineyard, the influence of different soil management practices on labile carbon and nitrogen and its dynamics of Rendzin Leptosol was studied. In 2006, an experiment of the different management practices in a productive vineyard was established in the locality of Nitra-Dražovce (part of the Nitra City), which is in the Nitra wine-growing area (Slovakia). The following treatments were established: 1. control Co (grass without fertilizers application), 2. T (tillage), 3. T + FM (tillage + farmyard manure), 4. G + NPK3 (grass + NPK 120-55-19 kg ha^-1), 5. G + NPK1 (grass + NPK 80-35-135 kg ha^-1). Soil samples were collected every month (0-20 cm), during the year 2010. The results showed that labile carbon content (C_L) fluctuated from 1820 to 2673 mg kg^-1 and the soil management practices had a statistically significant influence on C_L. The C_L contents under T, T + FYM, G + NPK1 and G + NPK3 increased by 6  %, 11  %, 5  % and 13  %, respectively compared to Co treatment. During 2010, the dynamics of C_L found no trend in all treatments. The highest N_pot content was in Co treatment (90 mg kg^-1) than in other soil management practices in a vineyard. On average, there was a smaller higher value of N_pot in T + FM (78 mg kg^-1) than in G + NPK3 (77 mg kg^-1). During 2010, the dynamics of N_pot found no trend in all treatments, except Co treatment. In Co, the N_pot decline at an average speed of 4.18 mg kg^-1 year^-1. The C_L: N_pot ratios were different and their values were significant correlated only with N_pot (r = -0.854, P < 0.001). During 2010, the dynamics of C_L: N_pot ratio showed an increasing trend with time in Co treatment.

Keywords: labile carbon, Rendzin Leptosol, potentially mineralizable nitrogen, vineyards, fertilizers application

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