Effects of N Fertilization Strategy and Fixed Ploughing Date on Nitrate Leaching on Field Vegetable Cultivation

Schwarz, Andreas; Pfenning, Judit; Bischoff, Wolf-Anno; Liebig, H.-P.

doi:10.17660/actahortic.2010.852.12

Cited by 2 publications

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“…Consequently, based on the low N min concentration after late tillage, high N losses occurred during the winter season. Therefore, the incorporation of easily decomposable crop residues high in N should be postponed until spring to minimize the risk of, e.g., NO 3 − leaching during the winter season [37,74,75]. However, this strategy highly depends on the N uptake capacity and growth performance of the spinach crop residues, as discussed below.…”

Section: Effects Of the Tillage Season On Potential N Lossesmentioning

confidence: 99%

“…To achieve decreased mineralization after crops are grown in the autumn, strategies such as a shallower tillage depth [34] or a postponement of the tillage date from autumn to winter or even to spring may be appropriate [35][36][37][38]. During winter and early spring, the soil temperature is lower compared to the autumn season, which can considerably reduce the mineralization and nitrification of vegetable crop residues and native soil organic N [39,40].…”

Section: Introductionmentioning

confidence: 99%

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Crop Residue Management Strategies to Reduce Nitrogen Losses during the Winter Leaching Period after Autumn Spinach Harvest

et al. 2022

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In open-field vegetable production, high quantities of soil mineral nitrogen (Nmin) and N-rich crop residues often remain in the field at harvest. After the harvest of crops in autumn, this N can lead to considerable nitrate (NO3−) losses during the subsequent winter leaching period. In four field trials, different tillage depths (3–4, 10, 30 cm) and dates (early autumn, late autumn, early spring) were investigated to reduce N losses after growing spinach in the autumn. In a further treatment, the nitrification inhibitor 3,4-Dimethylpyrazole phosphate (DMPP) was directly applied to the crop residues. Potential N losses were calculated by a balance sheet approach based on Nmin concentration (0–90 cm), measured N mineralization and N uptake by catch crops. By postponing the tillage date from early to late autumn or spring, resprouting spinach stubbles acted as a catch crop, reducing N losses by up to 61 kg ha−1. However, if the spinach biomass collapsed, the N losses increased by up to 33 kg ha−1 even without tillage. The application of DMPP as well as the tillage depth were less effective. Overall, postponing tillage to spring seems to be the most promising approach for reducing N losses during the off-season.

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Section: Effects Of the Tillage Season On Potential N Lossesmentioning

confidence: 99%