Newspaper Archive of
Superior Express
Superior, Nebraska
December 7, 2017     Superior Express
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December 7, 2017

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8A tHE SUPERIOR EXPRESS Tnursclay, (aeeemla~-r 7.2Ot 7 Jenny's REESources Amelioration ~trategies after corn mm r~tdue rem0va~ The la.~l two weeks I've shared research resnhs reLzarding cure slOV~ cenmvat an~ impacts on n ~tnent, soil erosion, soil organic car- bcm and the suceeedir,g crop yields. Most of the 5|LI~L@5. including the ones I write about here. are t.,untinuous corn and stover removal each year to deter- mitre the Ixaenual worst ea~ ~enarios and recommendati,~s tbr producers. Some have asked how amelioration practice~ such as c'~ver crr~ and add- mE manure affect ~utrienl and soil pmpcrlies when cam stayer Ls term wed. More r~s~a.n.-h has beea published in the past year with research ongoing. A key factor when looking at them re- .arch results is to know what was the soil type in Lhe study: silt loam mik and imgated situatiOrL~ appear to be more resilient than sa~y ones and non-irrigated environmems. One study from 2013-2016 looked at .,;oil propet~ chang~ andcom yield with five different earn residue re- moral rates (0, 25. _~O= 75 "am] I()0 percent)anddle addition ofthr~ co ~er crop treatment~ (no cover: early cereal rye terminalion of 2-3 weeks I~or to corn planting: late cereai rye temli~a- lion mostly occurring within [0 days after cam wasptanmdL Th, s was mud- ted in a n~n-irrigated (Rogers Menm- rim Farm near Li~'oln) and an irri- galed environment ~South Central Ag Lab near C]lay CenLer) "lx~th in rw-till contintious tom systems. Berth h~.'a- lion,, had sill Inam ~lib,. Re',. idue was removed in mid IO late Octo~r e~'h ye~ at each I(~amm and ,.~real rye co~er crop tremmenzs were drdled sh,~]y th~reafter.q'hecover c r,',p~ were el+it ir~gated fi)r e~tahli~.hment or addi- i,onal growth. F~r soil prt~perhe.,,. ~et aggregate ~tah=lity im determine pt~lential It=~ aler et~)ston 1. COllCentrati~n'Lh of pa]F liculate oTganlc nzat~t. ,,t)~ t,rgani carbx.m and total ,,o11N alh't three .~ear,. (if 111a:iia~enlell[ '.~.elX, i|lea,dffed. "['here ~as a red Lr.ct.ion I1% ~>1~ el agg~_a|e stahil~.t) in the non-irrL~ated ,dee twer three b~a~ with coniplcte ret, iduc ~muvaI ~,ugL~cMtn)J th~ l~ten, tint fur itu.-reased water eto~,ion. Ira- gated ~oil~ may be n)ore resilient ill Iheir leSlxm~,c to wet aggregate .~tabil- ily to residue renewal ~ugge~ting that n~.~r ~sidue L~mtd IX" ren~=vel:l from irrigated sites compared Io non-irli- ~aled sites in the .,,M~rt term. Early termination appea~e,J It] ha,~e no cff,..X.'l (,n o fl--~'llin~ the ,.'am ~M.tlue removal cftt.'C'LS on water ero.',itm potential. Later trrminalion of lhe cover crop resulted ul im:~am Of wet aggregate~,tabilily al Nqh ], s.'a~ior,s. Or. a-~eFage, later .~=ver ~.r~)p temlinatkm !r~'sLtl.ted i~1 (~'.7 1Oll.'.t T~'r acre hio]nass~x~mpaxed to 0.2 tons wr ace: trader early terminatitm. ]n- c-rea~cd cu'a~r Crop bior0;t.~s (K'~'u~X.~ here residue was removed compared Io '~ here it was nol. The antl'~rs ~J~g- ~e~t that a cover crop bioma..~ )eid al~N~-~,. ~l 3 lttny, i~'r at'It ma.~ oi'l~,cl die ~,x d:~t.'r *,2Yt~,ll~Jl i'~fllltla] t'II'L'UI*, t~I crop ~',:~ idu r11li1~,.3[. So~l ,]rganic carh, m and tel;i] r111ro- ~L'L| K4,~tlccntFatlOO~, wercrL+l hl~.2nltl. Canll) aftectL',d b)' e=thet r~,due ~.-- II1)~, al ~ |T t Inling Of ~:rop tenl~.ina- elan in either ~,iteafler three years. 1"hi,, ',uggc~t,. that in tile slmrt lerm. e~n 't~.lfti fa~ i~f rt~_ idur n~nloval do nt)t reduce tl~-'.heconu'entratitms_ Additit>n of cm'er crops after residue removal at ht~th sites increa,,ed ~il organic car- htlri c~sncelltr-atita:lS_ A 13-5 p,~rnt increase ill paniculate t)l'ganic carhoi| wa~ oh~erved ~lth laler lern|inatkm o~,'er e~,r]~ h:rillinal]a~n alld tile o~lrol Ileaiil~lti!.. al tht' IErl~ah.%~ P, itt." al the I 1~,,~t depth 'lhe~e ~,, ere tit t'.:l'l'~'t~, at thc 2 ~ot~t depth. ]~.'M~,hle r~.Illlt~.x;ll and co~,t.'r crop Ite.~||ti'eJtl~.,r'l date dpd n