Improving corn yields and NUE with late N applications using high clearance equipment

Transcription

1 Improving corn yields nd NUE with lte N pplictions using high clernce equipment Dorivr Ruiz Diz Andrew Stmmer Dep. of Agronomy, Knss Stte University

2 Bckground Previous studies showed significnt mount of N uptke post-flowering. From: Json DeBruin, DuPont Pioneer.

3 Objectives Assess the vlue of split N ppliction with postflowering ppliction nd emphsis on yield nd NUE. Evlute folir N ppliction using N sources with ure-formldehyde/trizone with post-flowering ppliction. Evlute the benefit of fungicide pplictions on yield nd NUE with lte N pplictions.

4 Tretments Tretments Description 1 0 lbs N/cre (Control) lbs N/cre t plnting lbs N/cre t plnting t tsseling t tsseling t tsseling + folir N t tsseling t tsseling + folir N t tsseling Tretments included with nd without fungicidetotl of 14 tretments.

5 Mterils nd Methods 3 loctions in 2016: Neosho: rin feed Rossville: irrigted Scndi: irrigted 4 replictions. Folir N pplied t 4.5 lbs N/cre (Trizone). Fungicide: Hedline (pyrclostrobin).

6 Mterils nd Methods N rtes: N plcement/time: Pre-plnt Split Split + Folir N Fungicide: Yes No

7 Mterils nd Methods 76 in clernce

8 Mterils nd Methods

9 Corn yield response to the min effect of N rte 140 Neosho 240 Rossville 240 Scndi Yield (bu/cre) b Yield (bu/cre) b Yield (bu/cre) b N rte (lbs/cre) N rte (lbs/cre) N rte (lbs/cre)

10 Min effect of N ppliction method nd fungicide Neosho 140 Appliction method Fungicide Yield (bu/cre) Pre-plnt Split Split+Folir N Appliction method No Yes Fungicide ppliction

11 Min effect of N ppliction method nd fungicide Rossville Yield (bu/cre) Appliction method Pre-plnt Split Split+Folir N Appliction method Fungicide No Yes Fungicide ppliction

12 Min effect of N ppliction method nd fungicide Scndi Appliction method Fungicide Yield (bu/cre) Yield (bu/cre) b b Pre-plnt Split Split+Folir NN Appliction method No No Yes Yes Fungicide ppliction

13 Min effect of N ppliction method nd fungicide All loctions Appliction method Fungicide 188 Yield (bu/cre) b Pre-plnt Split Split+Folir N Appliction method No Yes Fungicide ppliction

14 Folir N nd fungicide ppliction with the 200 lbs N/ rte cross loctions Fungicide + Fungicide p<0.1 Grin yield (bu/cre) c 185 b 173 b 186 b Pre-plnt Split Split+Folir N

15 Folir N nd fungicide ppliction with the 200 lbs N/ rte cross loctions Fungicide + Fungicide p<0.1 Grin N (%) c bc bc b Pre-plnt Split Split+FolirN

16 Additionl mesurements Totl plnt N uptke. Nitrogen Use Efficiency (lb/lb) Grin weight / N supplied. Utiliztion Efficiency (lb/lb) Grin weight / Totl N in plnt. Uptke Efficiency (%) (Totl N in plnt / N supplied) x 100. Nitrogen Recovery (%) [N uptke (fertilized plot) N uptke (0-N plot)] / [N pplied] 100. Nitrogen Hrvest Index (%) (Grin N content / N totl in plnt) x 100.

17 Summry Yer 1 Preliminry results showed soil-pplied N post-flowering cn provide N for corn uptke. Consistent response to fungicide ppliction for ll loctions in Trizone-bsed folir N showed positive results in 2016 (minimlized when fungicides re used).

18 Summry Yer 1 High yielding irrigted s well s rin-feed conditions my benefit from lte N ppliction. N movement to the root zone for uptke cn be limittion under drylnd? Evlution of nitrogen use efficiency under different mngement systems.

19 Thnk you!