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- Title
Response of No-Till Grain Crops to Pig Slurry Application Methods and a Nitrification Inhibitor.
- Authors
Gonzatto, Rogério; Aita, Celso; Bélanger, Gilles; Chantigny, Martin H.; Miola, Ezequiel C. C.; Pujol, Stefen B.; Dessbesel, Alexandre; Giacomini, Sandro J.
- Abstract
The effects of application methods and nitrification inhibitors on the fertilizer value of pig slurry (PS) in no-till crops are still poorly documented. We evaluated grain and straw yield, and N accumulation of no-till corn (Zea mays L.), oat (Avena strigosa Schreb.), and wheat (Triticum aestivum L.) from 2011 to 2015 on a loam soil under a subtropical climate. The crops received either: (i) no fertilizer, no dicyandiamide (DCD) (control), (ii) surface-broadcast of urea-N (reference treatment), (iii) surfacebroadcast pig slurry (PSs), (iv) PSs + DCD, (v) shallow-injected pig slurry (PSi), or (vi) PSi + DCD. Broadcast applications were performed manually whereas injection in furrows (≈10 cm) was made with a commercial applicator. Corn and wheat grain yields were similar with pig slurry and mineral fertilizer, confirming the good fertilizer value of pig slurry for no-till grain crops. Compared with surface broadcast, shallow injection of pig slurry increased grain yields of corn (+1.5 Mg ha-1) and wheat (+0.3 Mg ha-1), nitrogen agronomic efficiency (NAE) of corn (+9 kg grain kg-1 total N applied) and wheat (+2 kg grain kg-1 N), and apparent nitrogen recovery (ANR) in corn (46-68%) and wheat (29-38%). Crop performance was generally not affected by DCD, except for wheat in 2013 with increased yield (+15%), NAE (+2.7 kg grain kg-1 N), and ANR (31-39%). Pig slurry injection improved yield and N use efficiency of no-till grain crops, whereas DCD addition to pig slurry appeared more favorable for winter than summer crops.
- Subjects
NITROGEN fixation; WHEAT
- Publication
Agronomy Journal, 2017, Vol 109, Issue 4, p1687
- ISSN
0002-1962
- Publication type
Article
- DOI
10.2134/agronj2016.09.0547